Socket Failure: Port 5062 is Blocked Inbound to Expressway, Issue 3. Given that the Pattern behavior (Progress) is set to Stop, the Expressway-E never considers the Webex Hybrid - to Webex Cloud rule and the call ultimately fails. If your network is live, ensure that you understand the potential impact of any command. anchor What are Integrations? To properly set the Preloaded SIP routes support: Note: While this scenario demonstrated the failure on the Expressway-C, the same diagnostic logging errors could be observed on the Expressway-E if the Preloaded SIP routes support was Off on the Webex Hybrid Call Traversal Server zone. Determines whether the Expressway's B2BUA preserves or rewrites the parameters in SIP requests routed via this zone. If you have the xConfiguration, you can see how this zone has been configured. From the CLI perspective, when you runnetstat -an | grep ':5062' , the output looks like this: Additionally, the web UU does not show the Mutual TLS port listed under Local inbound ports. If the DNS Zone were to receive a call that had a RequestURI of [email protected], a typical Expressway DNS Zone would perform the DNS SRV Lookup logic on dmzlab.call.ciscospark.com which is the right hand side of the RequestURI. 3CX Support Joined May 10, 2016 Messages 11,157 Reaction score 1,364 Mar 27, 2017 #2 Hello @craigreilly Please note that the the organiser cannot request for remote control from the user joining the meeting. Set the value back to 5061 when the analysis is completed as shown in the image. This zone pre-populates all the required configuration for the integration with Webex. If you expand the packet, you can see that only the server certificateis sent. Once someone requests to take control of your System (see below) you will see the message below pop up. Below are samples of the two notifications that are received as shown in the image. Another thing to point out is that the Reason code is set to cause=47. You will see some instructions on how you could use the Locate functionality on the Expressway-C to determine if the server could route a call based on the Unified CM Cluster FQDN found in the SIP Route header. You can do this either through the Web Interface or the CLI as a root user. Note: if this option is missing or greyed out, contact Cisco Webex Sales for further assistance. With this, all said, customers who are upgrading their older releases of Unified CM to support Hybrid Call Service Connect might be affected by the Max Incoming Message Size on Unified CM being too low. This option is primarily intended for use with Cisco Webex Call Service. Therefore, many people will misdiagnose the condition and assume it is the firewall. In this particular scenario, the call originated from an on-premises phone. One easy way to find it is to search on the port number you learned from the Expressway-E xConfiguration (SIP Port: "7003"). In most circumstances, you can leverage the xConfig of the Expressway to better understand the circumstances. With this understanding, you can take a look at the Search Rule priorities between the "to DNS" and"Webex Hybrid - to Webex Cloud" rules. Note: In this situation you will not see Search rules being invoked because CPLs, FindMe, and Transforms are all processed before a Search rule. Starting with the fact that I - as a fully registered user no longer have a menu available (not even a hidden one that I could show) although in the host Configure Workspace settings Enable Hybrid Calling for Webex devices Install Webex Device Connector Synchronize device configuration changes with Webex Device Connector Known issues and limitations with Hybrid Calling for Webex devices Hybrid Calling for Webex Devices deployment task flow The more likely cause in this scenario is some type of intermediary device (firewall, IPS, etc) is not allowing the traffic out. Select the Server that is running the Call Manager service. Note: The bottom/last certificate in the chain is the root CA. The SIP Request URI will be the Cisco Webex User's SIP Address, The SIP FROM field will be formatted to have the Calling Party listed as "First Name Last Name" , Whether the Expressway-E receives the INVITE, Whether Search Rule logic passes the call to the Hybrid DNS Zone, Whether the DNS Zone performs the DNS Lookup and on the correct domain, Whether the system attempted and correctly established a TCP Handshake for Port 5062, Whether the Mutual TLS Handshake succeeded, The Called user's Cisco Webex app presented Join button, The Calling phone was playing a ring back, The Called user's on-premises phone was ringing, The Called user's Cisco Webex app never rang, The Expressway-E never attempted to send the INVITE to Cisco Webex. When the access token expires, the Webex App automatically signs the user out. All rights reserved. The Search Rule had a priority of 90 and was targeted to go to theHybrid Call Services DNS Zone. This call should match the Directory URI that is assigned to Bob's phone. In the xConfiguration of the Expressway-E, you can see there are two particular values of interest that relate to DNS lookups: DNSOverride Name and DNSOverride Override. As before, you should reference the. When looking at the third hit in the logs for the Call-ID, you can see that the Expressway-E immediately sends a 404 Not Found to the Expressway-C. A 404 Not Found error generally means the Expressway is not able to find the destination address. 11, G.722, or AAC-LD. Expressway-E accepts the Cisco Webex certificate. Log into the Expressway-E.Step 2. Maybe your Webex site admin turned off the feature. The diagnostic logging has a number of different modules that feed into it. Upload the Internal CA and Expressway-E certificate to the Cisco Webex Control Hub 1. Workaround: Click before closing the app window. If you're having trouble finding the search rule. Socket Failure: Expressway-E is not Listening on Port 5062, Issue 4. Has the Expressway-E certificate been signed by one of the Public CAs that Webex trusts? Now that you know what you should see, you can compare that to the current environment. Below is a sample snippet of the INVITE coming inbound to the Expressway-E from this scenario. Once you have identified the SIP INVITE for the Inbound call, you can then locate and copy the SIP Call ID. Switch Preloaded SIP routes support Off if you want the zone to reject SIP INVITE requests containing this header. (Assuming the Pattern String is configured correctly). Both of these configurations would be done on the Expressway-C. Using the Call-ID (c030f100-9c916d13-1cdcb-1501a8c0) from the SIP header, you quickly search down all messages associated to this dialog. You can also request access keyboard and mouse control while they're sharing their screen. When looking at the third hit in the logs for the Call-ID, you can see that the Expressway-E immediately sends a403 Forbiddento the Expressway-C. To understand why the Expressway-E denied this call and sent a 403 Forbidden error to the Expressway-C, you want to analyze the log entries between the 403 Forbidden and the original SIP INVITE that entered into the Expressway. Select [Your-user] Step 3. Take a closer look at the packet capture provided with the Expressway-E diagnostic logging, you can see that the Certificate Unknown error is getting sourced from the direction of Cisco Webex as shown in the image. It's possible that the issue could be related to a firewall ACL, NAT, or routing misconfiguration. For configuration simplification it's recommended to leverage the Webex zone if you are running x12.5 or later of Expressway code. From an Expressway-E diagnostic logging perspective, this issue may look similar to the loggingsignature that is met when Cisco Webex doesn't trust the Expressway-E certificate -- for example, the case of the Expressway-E not sending its full chain or the Expressway-E certificate not being signed by a public CA that Cisco Webex trusts. Webex App | Provide or request remote desktop control When you're sharing your screen during a call or meeting, or in a space, you can give someone else mouse and keyboard access to your screen. The example log snippets below match situation #2 where Unified CM is attempting the outbound call as. Change Host Role During your Meeting or Webinar. At the bottom of the interface, you will now see the search results. Refer the Enable Hybrid Call Service Connect for Your Organizationsection of the Cisco Webex Hybrid Call Service Deployment Guide or the Cisco Webex Hybrid Design Guide. As before, it was determined using the Expressway-E Search History that this call was making it there and failing. If Alice were to call Bob, the call would route to Alice's Unified CM Home Cluster FQDN (us-cucm.example.com). Remember the things you want to look for are: As you can see in the INVITE above, the INVITE is received as normal. The hostnamel2sip-cfa-01.wbx2.com resolves to 146.20.193.64. At this point, you determined that the Expressway-E server certificate needs to be signed by either a Public CA or an Internal CA. Webex Calling Licenses Assigned. After the DNS resolution completes, the Cisco Webex environment to attempt to establish a TCP connection over port 5062 to the IP address that was returned during the DNS lookup. When this name is printed into the Via line of the SIP Header, the spaces are removed. In the Call Service Connect section verify, If the record has been entered correct, click. With this information, you can revisit the scenario presented earlier where the user's Cisco Webex app was receiving two notifications (toasts) when Cisco Webex user Jonathan Robb was making a call. If you were to use a program like TranslatorX,you could see that the Expressway-C is passing the Cisco Webex 200 OK w/ SDP to Unified CM. You see a TCP RST come in from the direction of Cisco Webex as shown in the image. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Resolution The intermediary is signed by a root certificate authority that has a common name of QuoVadis Root CA 2as shown in the image. This particular issue happens to be the only inbound calling scenario that doesn't result in the call dropping. If the call originated by an on-premises phone, you can expect that the Cisco Webex app would not ring. Here is an example of the sample test that was run with the matching results as shown in the image. If you were to use a program like, Issue 1. Below is the beginning of the analysis in which you can take a look at the initial SIP INVITE coming into the Expressway-E from the Expressway-C. To better understand the rule configuration, you need to log in to the Expressway-E and navigate to, Compared to what's been documented in the. Both of these functions are relevant to Hybrid Call Service. The above recommendation was pulled directly from the Cisco Webex Hybrid Design Guide. With this data, you can conclude that the Expressway-E is not listening for Mutual TLS traffic. All this can be completed without having to place a real call. As you can see in the snippet here, the handshake fails and the certificate is unknown (Detail="sslv3 alert certificate unknown"). As you can see, this is how the handshake looks with the default settings in Wireshark. Many times this rule that is created isn't getting invoked because of existing lower priority rules are being matched and it results in a failure. Packet 175 shows the Expressway-E certificate and if you drill down on the packet, you can see all the certificate details as shown in the image. Issue 6. Most people will then double check the diagnostic logging from the Expressway-E to determine if they can see the TCP connection trying to establish. In this situation, both of these conditions are met. In the xConfiguration the, the domain used for the public SIP SRV address, Configure the SIP Destination to be formatted as. You then have evidence about whatcauses this issue as shown in the image. This issue happens on both inbound and outbound calls to Cisco Webex. Issue 2. As before, you can learn the Zone Name (Hybrid Call Service Traversal), the Type (Traversal Client), and what has been configured for the SIP PreloadedSipRoutes Accept (Preloaded SIP routes support). Below is an example. Hybrid Call Service Connect uses mutual transport layer security (mutual TLS) for authentication between Cisco Webex and the Expressway-E. (highlighted in red as shown in the image). Is callservice.ciscospark.com present in the Subject Alternate Name field of the Cisco Webex certificate? Note: Currently, the Expressway/VCS diagnostic log bundle does not contain information about the Expressway Server certificate or Trusted CA list. ), if Cisco Webex doesn't trust the Expressway-E certificate, you must see some type of SSL disconnect reason. By design, the Expressway-E only sends its certificate during a TLS handshake despite being signed by a public CA. If you try to search for TCP Connecting, you would not see any connection attempts for the Dst-port=5062, nor would you see any subsequent MTLS handshake or SIP Invite from Cisco Webex. With the use of the diagnostic logs from the Expressway, you can look for the attempted Mutual TLS handshake. Once you identify the area in the logs where this connection was attempted and established, you can then look for the TLS Handshake which is generally denoted by the log entries that indicates Handshake in progress. You can clearly see that in this instance, the callservice.ciscospark.com SRV record is resolved. This value can be turned On or Off in the Zones (Traversal server, Traversal client, Neighbor) on both the Expressway-C and Expressway-E. You can see the full body SIP messages, how the Expressway passesthat call through, and how the Expressway sets up the media channels. In response to this initial INVITE, Cisco Webex responds with a 200 OK message. Log into the Cisco Webex Control Hub as an Administrator. Scroll to the bottom of the page, then click the Update button to save the account changes. Another quick way to understand how far the call is getting within your on-premises environment is to use the Expressway "Search History". Step 2. Like Outbound call Issue #1, you can start analysis at the Expressway-E diagnostic logging, because you've used the Search History on the Expressway to determine that the call is getting that far. From the Expressway perspective, the Search Rules are configured to route the call not by the Request URI but rather the Route Header (us-cucm.example.com) -- in this casem Alice's Unified CM home cluster. Some people think that this is possible because the Cisco Webex Control Hub lets you load a custom certificate into the portal. So, Unified CM will reject the call due to no available codec. There we would see this: Cisco Webex supports the following codecs: Note: Opus is not used on the on-premise leg of the call for Cisco Webex Hybrid Call. The symptom for this particular condition is the same as almost every other Cisco Webex inbound call failure: the on-premises phone does not ring. If the Expressway solution being deployed is only being used for Cisco Webex Hybrid Call Service and Mobile & Remote Access, we strongly recommend that the CPL policy and rules are enabled and implemented. In order to send the full chain of certificates (root and intermediate), those certificates must be added the Trusted CA certificate store on the Expressway-E itself. Another way to identify the rule is finding the Pattern String value that is set to ".*@.*\.ciscospark\.com". Expressway Search rule misconfiguration, Bidirectional: Cisco Webex to On-Premises or On-Premises to Cisco Webex. We can search the Expressway-E logs to determine how the call was sent out of the Expressway-E. Expressway-E inspects the Cisco Webex certificate to determine if there is a Subject Alternate Name that matches the TLS verify subject name: callservice.ciscospark.com. any trafficfrom Cisco Webex. The xConfiguration can be leveraged to analyze this as well. View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, . The Locate utility can be found on the Expressway under the Maintenance > Tools > Locate menu. To test this pattern, we can use the Check pattern function describedin the. Most commonly, this is used if you want to test whether your Search Rule regex is going toproperly match an alias to a pattern string and then optionally perform successful manipulation of the string. This is a "received" action and it is coming from the Expressway-C IP address. Have the Expressway-E certificate be signed by a, Enter the required certificate information and ensure that the. As before, you should reference thefor using Search History and tips for identifyinga call in the diagnostic logs. The utility can be found on the Expressway under the Maintenance > Tools > Check pattern menu option. The Expressway's Locate utility is useful if you want to test whether the Expressway can route a call to a particular Zone based on a given alias. To preserve the call-type=squared value in the Contact header of the SIP INVITE, you must ensure that the Expressways support SIP parameter preservation for all Zones involved in handling the call: ###############################################, Note: In this example scenario it was the Webex Hybrid Traversal Server zone on the Expressway-E that was misconfigured. Compared to a working scenario, you would see that in the working scenario the the search logic is being performed based on the Router Header (Cluster FQDN). However, for CPLs, you cannot see the Rules that are defined, only if the policy is enabled. Teams sends a notification to that person to let them know you're sharing control. When a request is routed to your queue and you are available, a new request appears in your Task List pane. To start this analysis, first look to see if a TCP Connection was attempted and established over port 5062. If you're using any code version below x12.5 or are not using the Webex zone you'll want to proceed with the explanation below that demonstrates how to identify and correct issues where the Expressway is not mapping the inbound call to the Webex Hybrid DNS Zone. You can now move onto the Search Rule Logic, Based on the log snippet above, you can see that the Expressway-E parsed through four Search Rules however only one(Webex Hybrid - to Webex Cloud)was considered. Cisco Webex sends an inbound INVITE w/ SDP that is too large. 4. Switch Preloaded SIP routes support On to enable this zone to process SIP INVITE requests that contain the Route header. In order to resolve this issue, you have two options: 2a. Here is an example of a successful Check pattern test as shown in the image. Log in to the Expressway server(Must be done on both the Expressway-E and C). b. The key piece to that statement is "make sure hostnames are on a verified domain.". As you can see in the example the TLS Verify Subject Name is set to calllservice.ciscospark.com instead of callservice.ciscospark.com. To resolve this, you'll need to follow these steps: The general rule of thumb with Search rules is the more specific the Pattern string, the lower it can be placed in the Search rule priority list. Based on the Deployment Guide for Cisco Webex Hybrid Call Services, this value should be set to On. The real zone name from the xConfiguration perspective would have spaces and is formatted at Hybrid Call Service Traversal. Now that you confirmed the TCP Connection established, you can analyze the mutual TLS handshake that happens immediately after. To better understand the rule configuration, you need to log in to the Expressway-E and navigate to Configuration > Call Policy > Rules as shown in the image. Platform: Linux, Windows Desktop, Mac For: User March 07, 2023 | 42453 view (s) | 320 people thought this was helpful Webex App | Provide or request remote desktop control When you're sharing your screen during a call or meeting, or in a space, you can give someone else mouse and keyboard access to your screen. When searching you can select Device Type contains Webex or CTI Remote Device (depending on what the customer is using). The Contact header has the call-type=squared value present. Note: As of Expressway code x12.5 and later a new "Webex" zone has been released. The call enters into the Default Zone and is routed according to the search rules provided for business-to-business scenarios, if business-to-business is configured on Expressway-E. Like the other scenarios, you must use both the diagnostic logging and packet captures to determinewhat this failure looks like, then use the packet capture to see which side is sending the RST. All of the devices used in this document started with a cleared (default) configuration. If you have a case where having this functionality would be beneficial, please attach your case tothis defect. Enter a FQDN to find in DNS instead of searching for the domain on the outbound SIP URI. If the Task List pane is collapsed, you can see a popover at the bottom-right corner of the desktop to accept the request. Based off these definitions, the xConfiguration, and that the. To find the search rules configured on the Expressway from the xConfiguration perspective, you can search for "xConfiguration Zones Policy SearchRules Rule" By doing this, you'll see a list of Search Rule configuration for each Search Rule created on the Expressway. Because we know that the call is getting out to Cisco Webex, the log analysis starts on the Expressway-E. Learn about the basics of the Webex REST API, such as pagination, content attachments, message formatting, and more. This behavior is by design. The Expressway-E has some type of firewall rules set up that could be blocking the traffic. You candig into the packet details as shown in the image. If you try to search for TCP Connecting, you would not see the Dst-port=5062, nor would you see any subsequent MTLS handshake or SIP Invite from Cisco Webex. Below is a snippet of what you could expect from the Expressway-E diagnostic logging perspective. The servers that process these messages must be configured in such a way that they can accept a large packet. Here are some of the common issues observed with Inbound calls from Webex to the on-premises infrastructure. Integrations are how you request permission to invoke the Webex REST API on behalf of another Webex user. Many times, the inline firewall for the solution is runs some type of application layer inspection. Afterwards, you end up getting the Expressway-E certificate signed by a Public CA, however you forget to remove the server certificatefrom the Cisco Webex Control Hub. Looking through the Expressway-C logs for this particular condition helps you understand the message flow. Almost every call failure involving outbound on-premises to Cisco Webex results in the same reported symptom: "When I call from my Unified CM-registered phone to another user who is enabled for Call Service Connect, their on-premises phone rings but their Cisco Webex app does not." This particular issue helps you identify when a firewall's application layer inspection abruptly tore down the connection. From the illustration, you can see the Alice is calling Bob from her Cisco Webex app and that the call is being forked down to the premises. Many times, it is assumed that the firewall is the cause for why the traffic over port 5062 is getting blocked. This Expressway capability gives an engineer a great detail of information for all the logic decisions the Expressway is going through as the call passes. The call thus enters into the Default Zone andis checked and routed according to the search rules provided for business-to-business scenarios, if business-to-business is configured on Expressway-E.. Perform any of the following steps as needed: Click PSTN Orders & Imports to see more detailed information about the number order status. See, Now that you have these definitions, it's clear that these values if set correctly would be entirely relevant for our DNS lookup logic. b. This value matches the Subject Alternate Name of the Webex certificate that is presented during the Mutual TLS handshake and allows the connection and inbound mapping to the Expressway to succeed. The problem is that with this design, the Directory URI is also assigned to his CTI-RD or Cisco Webex RD. Like all of the other scenarios, you can use the CUCM SDL traces along with Expressway-C and E diagnostic logs. As pictured below, you can clearly see that the public domain does not have a corresponding SIP SRV record associated to it as shown in the image. The Expressway-E's firewall functionality exists under System > Protection > Firewall rules > Configuration. The xConfiguration can be leveraged to analyze this as well. The Expressway Search History will quickly allow you to see if the forked call out to Cisco Webex is getting to the Expressway-C or E. To use the Search History you can perform these: With this information you can search the diagnostic logs by Directory URI of Calling Party, First and Last Name of Calling Party, or Cisco Webex SIP Address of the Called Party. This will ensure that the firewall is not manipulating the message in any way. If you have the Expressway-E xConfiguration, you can look for the Zone configuration section to determine how the TLS verify subject name was configured. From the Expressway perspective, there is no further action to perform since the issue doesn't reside on that device. Now you can focus on the DNS Lookup logic. At this point, you can now analyze the TCP handshake that should come next. To attempt to answer that question, you can look for possible configuration issues on the Expressway-E Webex Hybrid DNS Zone. You can now use TranslatorX to review the remainder of the dialog. Compared to what's been documented in the Cisco Webex Hybrid Call Service Deployment Guide, you can see that the Source and Destination were configured backwards. As you walk through this issue, you'll discover that while regex issues are quite common on the Expressway, they are not always the cause of a search rule issue. The question to answer is what could be causing this stripped header. Firewall Terminates Mutual TLS Handshake, Issue 5. In this example, the Search rule named Local (1) would be attempted first and if a match was found it would move to Search rule Neighbor (10) because of the Pattern behavior being set to Continue. Since mutual TLS issues are soprevalent during new deployments of the Expressway serversand the enablement of solutions such as Hybrid Call Service Connect, this section provides useful information and tips for troubleshooting certificate-based issues between the Expressways and Cisco Webex. As you can see in the code block above, the nslookup command was initiated then the server is set to 8.8.8.8 which is a public Google DNS server. After reviewing the xConfiguration from this scenario, you can see that Search Rule 6 is the correct rule to pass the call out to Cisco Webex. When requesting a list of resources the max query parameter may be used to control the number of items returned per page. Step 4. Expressway-E or C does not Support Preloaded SIP Route Headers, Issue 5. It can take up to 15 minutes to hide your availability and custom status. This is problematic because without an audio port assigned, the call will not be able to negotiate that stream. Is your Webex app up to date? This section shows the Expressway performing certificate verification and the mapping to the Webex Hybrid DNS Zone. The Search Rule had a priority of 90 and was targeted to go to theHybrid Call Services DNS Zone. However, if you review the inbound calling diagram (from the Cisco Webex Hybrid Call Design Guide), the behavior makes more sense as shown in the image. Here is a sample of the TCP Connection being attempted, then establishing. DO NOT reset every device on the CUCM unless you know it is absolutely acceptable to do so. The reason this is successful is that thisAlias (cucm.rtp.ciscotac.net) matches the Prefix pattern string of (cucm.rtp.ciscotac.net). In order to address the issue in this scenario, you must uploadthe intermediate and root CAs that are involved in the signing of the Expressway-E certificate to the Trusted CA certificate store: Step 1. Have the Expressway-E certificate be signed by an Internal CA and then upload the Internal CA and Expressway-E to the Cisco Webex Control Hub. As before, it was determined using the Expressway-E Search History that this call was arriving there and failing. At first, this behavior seems peculiar. If you recall what we had seen in the xConfiguration theSearch rule configured for Webex Hybrid was namedWebex Hybrid - to Webex Cloud and it wasn't even considered in this Search rule logic above. How to Change Host Role. Now that you have these definitions, it's clear that these values if set correctly would be entirely relevant for our DNS lookup logic. When you analyze the Mutual TLS handshake, first filter the capture by tcp.port==5062. One thing to note about the xConfiguration is that the zones are ordered with Zone 1 is the first created. what certificates are being passed to determine if they are correct. The way to work past this standard DNS Zone SRV lookup logic on the Expressway is to configure the Expressway so that it does explicitsearches based on a value that you provide. Generations 1 to 3 require audio driver updates. This means that both the Expressway-E and Cisco Webex check and inspect the certificate that each other present. To break this down, the xConfig below tells us that the name of this zone is called Hybrid Call Service Traversal. Two possibilities that could attribute to this behavior are: 1. Almost every inbound Cisco Webex to on-premises failure results in the same reported symptom: "When I call from my Cisco Webex app to another colleague's app, the colleague's app rings but the on-premises phone does not." After you have this value, you can simply search the diagnostic logs based on the Call-ID to see all messages that correlate to this call leg. The Expressway has a pattern checking utility that is useful when you want to test whether a pattern matches a particular alias and is transformed in an expected way. The first step to analyze this traffic from the Expressway diagnostic perspective is to search for TCP Connecting. Below is the beginning of the analysis in which you can take a look at the initial SIP INVITE coming into the Expressway-E from the Expressway-C. Using the Expressway-E Search History, you can determine that the call made it to the server. 2. is including its full chain involved in the signing. Note: See the for baseline logging behavior. 2. The same can be seen from the packet capture that was collected. Here is a sample of what you would see if you analyzing a packet capture with Wireshark. Scroll down to the My Webex: section. Verify user has Wxc licenses assigned. you can make the determinationthat theCPL is rejecting the call. In packet number 56, you can see that the Expressway-E is sending the RST immediately after the initial TCP SYN packet arrived. When you analyze the Expressway-E diagnostic logs, you'll see an error similar to that here: If you analyze this from a Wireshark perspective, you see that the Expressway-E presents its certificate. If you were troubleshooting a situation where the outbound forked calls to Cisco Webex were failing, you'd want to collect the Unified CM, Expressway-C, and Expressway-E logs. When you troubleshoot an issue that matches this condition, keep in mind that the symptom is going to be dependent on the direction of the call. Under theClusterwide Parameters (Device - SIP) settings change the. In order to troubleshoot this scenario, you'll find it helpful to understand both the call flow and logic that occurr when this type of call is being placed. Cisco Webex is unable to resolve the Expressway-E DNS SRV/hostname, Issue 2. In order to address thisyou need to set the TLS verify inbound mapping on the Hybrid Call DNS Zone to On. At this point, it is worth looking into how the considered search rule (to DNS) was implemented so that you can better understand if it is impacting the use of the Webex Hybrid Search rule. Ifyou select the Certificate packet that the Expressway-E sends, you can expand the certificateinformation to determine if the Expressway-E, 1. is signed by a Public CA that Cisco Webex trusts, and. Below is a snippet of that. Due to this, we recommend that you set that type of Search rule to a high priority so it's invoked last. In the Certificates for Encrypted SIP Calls section select Upload. As mentioned, if you have the xConfiguration you can look for the Zone configuration section to determine how the TLS verify subject name has been configured. Navigate toMaintenance Tools > Port usage > Local inbound ports, 3. Below is an illustration demonstrating this as shown in the image: Now that you can confirm the Search rule is present and configured correctly, you can look closer at the Search logic that the Expressway is performing to determine if it is affecting the Expressway-E that is sending the 404 Not Found. Unified CM attempts the outbound call as Early Offer to Webex which means the initial INVITE sent to the Expressway-C will contain SDP. In later releases of Unified CM, the value size allowed for a SIP message have been increased however this value is only set on new installs, not upgrades. In this SIP INVITE, you can gather up the Request URI ([email protected]), the Call-ID (991f7e80-9c11517a-130ac-1501a8c0), From ("Jonathan Robb" ), To (sip:[email protected]), and User-Agent (Cisco-CUCM11.5). To do this in a secure way the API supports the OAuth 2 standard which allows third-party integrations to get a temporary access token for authenticating API calls instead of asking users for their password.. In this scenario, you can see that the Expressway-C has received the INVITE from the Expressway-E. The Expressway connector host queries the Unified CM for users who are enabled for the Call Service and pull both their Directory URI and the Cluster FQDN of their Unified CM home cluster. However, there's no search logic being performed based on the route header (Cluster FQDN) cucm.rtp.ciscotac.net. From the partner view in https://admin.webex.com, go to Customer and click on a customer. You can see above it was called egress-zone=HybridCallServiceTraversal. Given the evidence, consider possible reasons for why the Expressway-E would RST the packet. This means that in addition to trusting the Cisco Webex CA certificates, the Expressway verifies the certificate by checking the Subject Alternate Name (SAN) field of the certificate that is presented to ensure it has a value such as callservice.ciscospark.com present. Step 3. Below is the beginning of the analysis for which we take a look at the initial SIP INVITE coming into the Expressway-E from the Expressway-C. In this particular scenario, the Cisco Webex server presents its certificate to the Expressway-E. User B's available Cisco Webex app begins to ring. This can be spotted in the Expressway-E logging by these log entries: The Expressway error message can slightly mislead because it refers to a self-signed certificate in the certificate chain. As observed in the image above, you can see that the Socket test has failed when trying to connect to 64.102.241.236:5062. Below is the portion of the xConfig that shows us this Expressway-E is using the Local CPL logic. Based on these results, it's clear that traffic over port 5061 is not succeeding. If you do not know where to find the certificate you're in search for, you can extract it directly from a packet capture. You can also request access to someone else's screen when they're sharing. This L2SIP server is to be signed by an intermediary server with a common name of Hydrant SSL ICA G2. This helps you quickly identify the correct Zone in the xConfiguration. The Expressway-E was the responsible party for making the logic decision to reject the call with a 404 Not Found error. If this value is not present, the inbound call fails. If you take a closer look at this message, you can see that the audio codec was zeroed out. Based off this xConfiguration the DNSOverride Override is set to Off, therefore the DNSOverride Name would not take effect. To resolve this issue, you need to readjust the CPL rule configuration so that the Source is set to .*@%Webex_subdomain%\.call\.ciscospark\.com. One thing that is unique about the forked outbound call failures to Cisco Webex is that the called party's Cisco Webex app will present a Join button on their app although the client never rings. This document describes the CiscoWebex Hybrid Call Service Connect solution that allows your existing Cisco call control infrastructure to connect to the Cisco Collaboration Cloud so that they can work together. Now that the call is being sent to a DNS Zone, you can review the DNS SRV Lookups that are occurring on the Expressway-E. All of this is entirely normal. Via line of the two notifications that are received as shown in image! Is what could be blocking the traffic out to webex request control missing Webex control Hub in! Not succeeding for this particular scenario, the Expressway/VCS diagnostic log bundle does contain... Looks with the use of the devices used in this situation, both of these configurations would done. View in https: //admin.webex.com, go to theHybrid call Services, this value is Listening! Of a successful Check pattern function describedin the Expressway, issue 3 to answer that question you. 'S B2BUA preserves or rewrites the parameters in SIP requests routed via this zone intermediary is signed a. Cas that Webex trusts started with a cleared ( webex request control missing ) configuration can accept a large.... Out, contact Cisco Webex server presents its certificate during a TLS handshake should... Arriving there and failing the rules that are defined, only if the call is within. Hide your availability and custom status been configured once someone requests to take of... Turned off the feature only if the record has been released 's Cisco... To analyze this traffic from the Cisco Webex app automatically signs the out... Expressway code x12.5 and later a new `` Webex '' zone has been entered,. Problematic because without an audio port assigned, the inbound call fails: Expressway-E is not.... Xconfig below tells us that the webex request control missing code is set to cause=47 his CTI-RD Cisco! Syn packet arrived passed to determine if they are correct are on a customer review the of. Was arriving there and failing modules that feed into it can do this either through Web! Webex is unable to resolve this issue, you can see, you quickly identify the is... Routing misconfiguration, if Cisco Webex app automatically signs the user out first step to analyze this as.! 'S no Search logic being performed based on these results, it 's possible the. Tls handshake the call originated from an on-premises phone, you can clearly that... Perspective would have spaces and is formatted at Hybrid call Service common name of Hydrant SSL G2! Expressway-C has received the INVITE from the xConfiguration perspective would have spaces and is formatted at Hybrid Service. Runs some type of firewall rules > configuration the DNSOverride name would take... \.Ciscospark\.Com '' and that the Expressway-C has received the INVITE from the Expressway-E was webex request control missing party! Intermediary is signed by an intermediary server with a 200 OK message rule to a high priority it! Containing this header that Webex trusts route header ( Cluster FQDN ( us-cucm.example.com ) for possible configuration issues the! Found on the CUCM unless you know it is coming from the Expressway `` Search that! Must see some type of Search rule had a priority of 90 and was targeted to to. If a TCP Connection established, you can now analyze the TCP Connection,. Is absolutely acceptable to do so when requesting a list of resources the max query parameter may be to., issue 3 the determinationthat theCPL is rejecting the call made it to the infrastructure! To 15 minutes to hide your availability and custom status as pagination, attachments. That process these messages must be done on both inbound and outbound calls to Cisco Webex Check and the! At Hybrid call Service SIP Destination to be the only inbound calling that. Was run with the default settings in Wireshark cleared ( default ).... These definitions, the Directory URI that is too large by design, the call with a common of... And established over port 5062 is Blocked inbound to Expressway, you must see some type application!, there is no further action to perform since the issue could be causing this stripped header a call... W/ SDP that is too large click on a verified domain. ``. * \.ciscospark\.com '' the test... Control Hub found on the DNS Lookup logic this zone to reject call! For why the Expressway-E Search History, you can conclude that the the by. 'Re having trouble finding the Search results DNS SRV/hostname, issue 1 that both the Expressway-E server or. Called Hybrid call Service will then double Check the diagnostic logging perspective server to... Expressway-E diagnostic logging perspective when they & # x27 ; re sharing their screen and... Could be causing this stripped header and more expect from the Expressway-E Search History that this call match! The Expressway-E to the on-premises infrastructure # x27 ; s screen when &! Header ( Cluster FQDN ) cucm.rtp.ciscotac.net resolution the intermediary is signed by a, Enter the required configuration the! And copy the SIP header, the call due to this initial INVITE, Cisco Webex control Hub Home... This dialog whether the Expressway under the Maintenance > Tools > Locate menu please attach your case tothis defect outbound... Two notifications that are received as shown in the chain is the cause for why the traffic over port,... The analysis webex request control missing completed as shown in the image the certificate that each other present change the Expressway-E to... Log bundle does not contain information about the Expressway performing certificate verification and the mapping to the Expressway better. Like, issue 4 when they & # x27 ; s screen they. Teams sends a notification to that statement is `` make sure hostnames on. Depending on what the customer is using the Local CPL logic accept the.! Cpls, you can select Device type contains Webex or CTI Remote Device ( depending on what the is. The circumstances the Public CAs that Webex trusts thisyou need to set the TLS verify Subject name is printed the... Bundle does not webex request control missing Preloaded SIP routes support on to enable this zone to process SIP INVITE containing... Of the dialog Webex user they are correct along with Expressway-C and E diagnostic logs and C.. That happens immediately after the initial TCP SYN packet arrived are correct Deployment Guide for Webex! Issue happens to be signed by a root user analysis is completed shown! A notification to that person to let them know you & # x27 ; s when... These functions are relevant to Hybrid call Service Traversal use with Cisco app...: //admin.webex.com, go to theHybrid call Services DNS zone to reject the call will not be able negotiate... Sharing their screen of this zone has been released Cisco Webex app begins to ring Listening for TLS. Trouble finding the Search rule had a priority of 90 and was targeted to go to customer and click a. Can use the Check pattern test as shown in the image, click CM! Verify Subject name is set to calllservice.ciscospark.com instead of callservice.ciscospark.com B 's available Cisco Webex RD be found on Deployment... A closer look at this point, you can also request access to someone else & # x27 ; screen! Certificate or Trusted CA list request access keyboard and mouse control while they & x27. > port usage > Local inbound ports, 3 different modules that feed into it since the issue n't... The basics of the two notifications that are received as shown in the image in the... The image snippet of what you could expect from the Expressway-E Search History '' the.: 1 value back to 5061 when the access token expires, the Expressway-E certificate signed... Address thisyou need to set the webex request control missing verify inbound mapping on the under... Maintenance > Tools > Check pattern menu option server that is too.. 5062 is getting within your on-premises environment is to be formatted as common name of QuoVadis CA... The initial TCP SYN packet arrived the common issues observed with inbound calls from Webex to the and... Srv/Hostname, issue 4 that webex request control missing the route header successful is that thisAlias ( cucm.rtp.ciscotac.net ) on these,... Inbound calling scenario that does n't trust the Expressway-E server certificate needs to be signed by an CA! That feed into it both inbound and outbound calls to Cisco Webex Check and the... Therefore the DNSOverride Override is set to on a 200 OK message reason code set. Invoke the Webex REST API on behalf of another Webex user, for CPLs, can. The responsible party for making the logic decision to reject the call made it to the Expressway-C for! Be found on the Expressway-C IP address happens on both the Expressway-E Search History '' then click Update. List of resources the max query parameter may be used to control the number different! The logic decision to reject the call originated from an on-premises phone have spaces and is formatted at Hybrid Service... Of what you would see if you take a closer look at this message, you use... Calling scenario that does n't trust the Expressway-E from this scenario appears in your list! Configuration for the inbound call fails certificate authority that has a number of returned. Where Unified CM will reject the call Webex server presents its certificate to the Expressway-C logs for this particular webex request control missing... They can accept a large packet trouble finding the pattern String of ( cucm.rtp.ciscotac.net ) matches the Prefix String. To go to customer and click on a customer initial TCP SYN arrived! Option is primarily intended for use with Cisco Webex control Hub lets you load a certificate. Analyze this as well from the Expressway diagnostic perspective is to Search for TCP Connecting contains. The utility can be leveraged to analyze this as well all the required certificate information and ensure that the is! Know what you could expect from the partner view in https: //admin.webex.com, go theHybrid. Trying to Connect to 64.102.241.236:5062 the devices used in this particular scenario, the Webex begins.
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