Learn more about how Cisco is using Inclusive Language. You may face this issue if your IE is working in offline mode. Because the issue was isolated, this data should be provided to the customer's network administrator. Consider the case where the Expressway-E checks the certificate for the callservice.ciscospark.com SAN but doesn't find that. From a Wireshark packet capture analysis perspective, you can clearly see that when the Webex environment presents its certificate then Expressway turns around and rejects with a certificate with an Unknown CA error as shown in the image. (highlighted in red as shown in the image). If you don't have any of this information, you can do a search on "INVITE SIP:" which will locate all SIP calls running over the Expressway. MP4 Recordings Default in Webex Meetings 40.10In the upcoming October (40.10) update, all-new recordings in Webex Meetings will be stored in MP4 format, either in the cloud or locally as selected at the site or host level, with a video-centric experience. Using the Expressway-E Search History, you can determine that the call made it to the server. Upload the Internal CA and Expressway-E certificate to the Cisco Webex Control Hub 1. Here are some of the most common issues observed with outbound calls from the Unified CM-registered phone to the Cisco Webex environment when the call is made to a user who is enabled for Call Service Connect. ', Small business account management (paid user). DO NOT reset every device on the CUCM unless you know it is absolutely acceptable to do so. The common translation for this isNo resourceavailable. The route header is populated based on the information that the Call Service Aware (Expressway Connector) portion of the solution delivers to Cisco Webex. To troubleshoot this type of problem, you're always going to need to collect diagnostic logging off the Expressway-C and Expressway-E. As a starting point, you can review the Expressway-E logs to determine that the SIP INVITE does in fact have the call-type=squared value present in the Contact header of the initial Cisco Webex INVITE sent inbound. This section shows the Expressway performing certificate verification and the mapping to the Webex Hybrid DNS Zone. In this particular scenario, the Cisco Webex server presents its certificate to the Expressway-E. 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. If Search Rule DNS was matched, the search would stop regardless of whether there was another Search Rule with a priority higher than 50, because the Pattern behavior was set to Stop. This issue happens on both inbound and outbound calls to Cisco Webex. At this point, you've isolated the problem to a misconfiguration of the Expressway-C Traversalclient zone configuration. Expressway-E is Signed by Public CA but Cisco Webex Control Hub has Alternate Certificates Loaded, Issue 6. Below is an example. If you're troubleshooting this issue using the Expressway diagnostic logs, you will not seeany trafficfrom Cisco Webex. At that point, you can then reproduce the problem. 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. By analyzing these log entries, you can typically see all the logic decisions that are being made. Repeat this process for every Unified CM node that is running the Cisco Call Manager service. You can see above it was called egress-zone=HybridCallServiceTraversal. After you search TCP Connecting, you'll look for the Dst-port=5062 value. 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." As nearly every other inbound Hybrid Call Service Connect call setup failure, the symptom is that the on-premises phone does not ring. A few line items later, the Cisco Webex environment rejects the certificate with a Certificate Unknown error as shown in the image. The Expressway will do this based on Search Rules. This fully confirms that the Webex certificate looks just fine. 11, G.722, or AAC-LD. 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. I work at a law firm's support office. They will general look for a log line item such as this as shown in the image. The way Cisco Webex handles this situation is that it cancels the particular call leg. For Hybrid Call Service Connect, you can also test that the Unified CM Cluster FQDN is going to match the Pattern string that you set upfor the Unified CM cluster FQDN. Best Plans & Pricing. The parameter Cisco Webex inserts into the SIP INVITEis called "call-type=squared" and this value is entered into the Contact header. The calling ID in this instance is the Display Name of the user initiating that call. 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. You can try to search for the information noted above on the Expressway-C to see if the call was routed that far. 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. With this information, you can conclude that the issue is isolated to the Expressway-E receiving the packet; you must troubleshoot the issue from the Expressway-E perspective. For non-SSO environments, open Phone Service settings and sign in again. With the settings identified for the Hybrid Call Service Traversal, you can look for potential settings that stand out, such as: Using the web interface of any Expressway, you can see what the definition of these values are and what they do. For tips on isolating call issues and analyzing logs, see the section of this article as shown in the image. I have just done a fresh install of IE9. Many times, it is assumed that the firewall is the cause for why the traffic over port 5062 is getting blocked. In order to understand how a call is routed based on these results, you can usethe Expressway Locate Utilitydescribed. Open Preferences menu. Expressway-E or C does not Support Preloaded SIP Route Headers, Issue 5. If you're trying to identify a Hybrid Call Service Connect call failure that matchesthis issue, you must get the Expressway logs in addition to Unified CM SDL traces. Find answers to your questions by entering keywords or phrases in the Search bar above. By doing this, the Webex environment will not attempt an SRV lookup but rather connect directly to the%Expressway_Pub_IP%:5062. When reviewing this SIP INVITE that is being sent from the Expressway-E to the Expressway-C, note that the Contact header is missing the call-type=squared. 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. 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. It's important to understand what type of traffic you're most interested in so that you can filter Wireshark to display just that. - edited If the Expressway-E does not trust the Cisco Webex signed certificates, you can expect that the Expressway-Ecan reject the certificate immediately after the handshake completes. Step 1. Then, type "appwiz.cpl" inside the text box and press Enter to open up the Programs. When reviewing this configuration, you can see the following is configured, Destination:.*@dmzlab\.call\.ciscospark\.com.*. Thanks for your quick response. Some people think that this is possible because the Cisco Webex Control Hub lets you load a custom certificate into the portal. Both of these configurations would be done on the Expressway-C. The Search Rule had a priority of 90 and was targeted to go to the, . If this condition is not met, Cisco Webex rejects the Expressway-E certificate. If you're trying to identify a Hybrid Call Service Connect call failure that matchesthis issue, you must get the Expressway logs in addition to Unified CM SDL traces. In these cases, the fix is to revert the site back to the newer Webex version.Cause:The following error occurs when playing a recording created on a newer site version than the installed Network Recording Player. This option is primarily intended for use with Cisco Webex Call Service. Error: 1000:2: FeatureSetNotProvisioned = 3: Sign into your account to use your phone . When you look at the Cisco Webex certificate that is passed, you can see that it sends the full chain. Issue 2. Repeat steps for all CA certificates involved in the signing of the Expressway-E certificate (Intermediate, Root).Step 7. Hybrid Call Service Connect supportsthree different audio codecs: G.711, G.722, and AAC-LD. Below are samples of the two notifications that are received as shown in the image. For clarity, the log samples provided in this illustration matched situation 3 where the call was sent outbound to Cisco Webex as Delayed offer. Another quick way to understand how far the call is getting within your on-premises environment is to use the Expressway "Search History". Using the Call-ID (d58f2680-9c91200a-1c7ba-1501a8c0) from the SIP header, you can quickly search down all messages associated to this dialog. After updating and restarting, boom!!! 99.9% I believe the graphics driver caused it. The scenarios below show you how to use the diagnostic logging to identify a CPL misconfiguration. Here are the steps for how to pull the Cisco Webex certificate that is presentedat a mutual TLS handshake. 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. In order to make this change: If you analyze the same capture now, you see packets 169 through 175 decoded. In order to resolve this issue, you have two options: 2a. You can then see that the Expressway-C correctly forwards the call out to the Unified CM (192.168.1.21). Once you're inside the Programs and Features screen, scroll down through the list of installed programs and locate your Microsoft Visual C++. Step 2. The question to answer is what could be causing this stripped header. The response is four different valid records all of which use port 5062. Once you have identified the SIP INVITE for the Outbound call, you can then locate and copy the SIP Call-ID. For more information about uploading your Expressway-E certificate in the Cisco Webex Control Hub, checkthis section of the Hybrid Call Deployment Guide. 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. This suggests there is nothing wrong with the Expressway-E certificate. Navigate to Maintenance > Security > Trusted CA certificate.Step 3. Here are the steps to complete that. Configure a public SIP SRV address for the Expressway-E on the site they use to host public domain names. Lastly, you are setting the record types to lookup to SRV records. Under theClusterwide Parameters (Device - SIP) settings change the. 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. If you attempt to troubleshoot this situation from an Expressway-E diagnostic log perspective, you do not see any trafficfrom Cisco Webex. When you troubleshoot a condition that matches this problem, you can use the diagnostic logs and tcpdump from the Expressway-E. Example of the Expressway-E mapping the MTLS connection to the Cisco Webex Hybrid DNS Zone: Here is a list of the most common issues that are related to mutual TLS failures between the Expressway-E and Cisco Webex. 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. Two logging modules are available on the Expressway which can help you better understand what logic the Expressway performs when you analyze the certificates: By default, these logging modules are set to an INFO level. At first, this behavior seems peculiar. The Inbound TLS mapping feature works in conjunction with the TLS Verify Subject Name, both of which are configured on the Hybrid Call DNS Zone. Knowing this, review the Cisco Webex Hybrid Call Service Deployment Guide and specifically review the Prepare Your Environment chapter where step 5 of the Complete the Prerequisites for Hybrid Call Service Connect sectioncalls out the specific codecs that are supported. Note: In this situation you will not see Search rules being invoked because CPLs, FindMe, and Transforms are all processed before a Search rule. * and the Destination Pattern is .*. Issue 1. As you can see in the packet capture that was obtained from the Expressway-E, the traffic over tcp port 5062 is not being blocked by the firewall but is in fact arriving. Question: What can I do about the following error with the Rockstar Games Launcher on PC?. When thinking about the Cisco Webex to on-premises call flow, Cisco Webex's first logical step is how to contact the on-premises Expressway. Here, you can see that the "to DNS" rule has a lower prioritythan the "Webex Hybrid - to Webex Cloud" rule -- therefore, the "to DNS" rule will be tried first. Scroll to the Call Service Connect section and look under the Certificates for Encrypted SIP Calls to see if undesired certificatesare listed. To troubleshoot this particular condition, you can use the techniques in the "Port 5062 is blocked inbound to the Expressway" scenario above. Hybrid Call Service Connect supports three different audio codecs: G.711, G.722, and AAC-LD. From the list, selectSSL,clickApplyandclose the window. This IP address is going to be the public IP address of the on-premises Expressway-E. An unknown error occurred. Therefore, many people will misdiagnose the condition and assume it is the firewall. If you look closely, you see that the SRV record response is providing a server address and port 5061, not 5062. Log into the Expressway server(Must be done on both the Expressway-E and C). Before you analyze the diagnostic logs on the Expressway, consider how to identify this call: With this information, you can search the diagnostic logs by Directory URI of Called Party, First and Last Name of Calling Party, or Cisco Webex SIP Address of the Calling Party. 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. Unified CM closes the TCP socket then the SIP dialog will time out. These devices can be restarted individually to minimize the impact on the environment. This will ensure that the firewall is not manipulating the message in any way. Webex then sends a 200 OK w/ SDP containing all the supported audio codecs Cisco Webex supports. This is a "received" action and it is coming from the Expressway-C IP address. Socket Failure: Port 5062 is Blocked Inbound to Expressway, Issue 3. The challenge in this scenariois that a TCP connection cannot be established with the Webex environment. With this information, the next logical step the Expressway will take is to send a TCP SYN packet to 146.20.193.64 so it can try to setup the call. Below is a sample of what you can expect in the Expressway-E logging during the TLS handshake: Take a look at this from the Wireshark perspective you can see here that the Expressway-E presents its certificate in line item 175. This means that both the Expressway-E and Cisco Webex check and inspect the certificate that each other present. For xConfiguration, note that the zones are ordered with Zone 1 being the first. The Expressway-C sends this 200 OKto Unified CM but Unified CM is only configured to only allow G.729 for this call. For more information regarding video-centric recording, go to Video-Centric Network-Based MP4 Recordings in Webex Meetings and Webex Events.Note:This error may occur if a Webex site is moved back to a previous lockdown version. To see if more information about the problem is available, check the problem history in the Security and Maintenance control panel. Search for Type SIP and IP port 5062. Cisco Webex app is receiving two call notifications (toasts), Issue 1. Choose Settings under the Hybrid Call card. The above recommendation was pulled directly from the Cisco Webex Hybrid Design Guide. Below is the portion of the xConfig that shows us this Expressway-E is using the Local CPL logic. If you focus on the xConfiguration of the Expressway-C, you can start by looking for the Traversal Client zone for Webex Hybrid. Packet number 175 is the certificate the Expressway sends to Cisco Webex. This information can also be captured through the web interface of the Expressway-E. See the steps below to gather this information, 2. If you're running x12.5 and deploying Webex Hybrid Call it's recommend to use the Webex Zone type so that the Hybrid Call Services Domain (callservice.webex.com) is auto configured for you. Error: 'Unknown file format.' when playing back a downloaded Network-Based Recording (NBR) file. Given the evidence, consider possible reasons for why the Expressway-E would RST the packet. It communicates to the Expressway-C over SIP TCP port 7003. Log into the Cisco Webex Control Hub as an Administrator. you can use commonly used naming values such as "Webex" to better locate the Search Rule. When you adjustthe SIP TLS port to 5062 in the Wireshark preferences, you can then see all the details that surround the handshake, which includes the certificates. When you analyze the Mutual TLS handshake, first filter the capture by tcp.port==5062. The Expressway solution typically interfaces with a firewall. Please share your comments if this solution works. Now that you confirmed the TCP Connection established, you can analyze the mutual TLS handshake that happens immediately after. Here are the results of the Locate. The important call out here is that we will want the following values configured: If the Regex for the rule is set up correct, you should see the result of this Check pattern Succeed. In the xConfiguration the, the domain used for the public SIP SRV address, Configure the SIP Destination to be formatted as. To answer the question of what happens, you must know that once the Unified CM receives a SIP message that is too large, it simply closes the TCP socket and does not respond to the Expressway-C. With this said, there are many situations and ways this could occur: Looking through the Expressway-C logs for this particular condition helps you understand the message flow. 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. Because we know that the call is getting out to Cisco Webex, the log analysis starts on the Expressway-E. Here is an example of a successful Check pattern test as shown in the image. The documentation set for this product strives to use bias-free language. In most circumstances, you can leverage the xConfig of the Expressway to better understand the circumstances. User B's available Cisco Webex app begins to ring. The Expressway solution allows for Toll Fraud mitigation by using the Call Processing Language (CPL) logic available on the server. 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. Navigate toMaintenance Tools > Port usage > Local inbound ports, 3. Try going to google.com on internet explorer. Cisco Webex then rejects this TLS handshake with an Unknown CA error message as shown in the image. The Device Pool contains the mappings to the Regions. The xConfiguration can be leveraged to analyze this as well. It's clear that nothing is wrong with the TLS Verify Subject Name. In this sample, you can see the Expressway processed four search rules. This particular condition is often diagnosed incorrectly. 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. Unified CM attempts the outbound call as Early Offer to Webex which means the initial INVITE sent to the Expressway-C will contain SDP. What you would find in this scenario is that the Unified CM ignores the large message from the Expressway-C. A logline item such as this will be printed. 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. Below is a sample of the search rule logic that the Expressway was performing. If you don't have any of this information, you can search on "INVITE SIP:" which locates all SIP calls running over the Expressway. Cisco Webex then sends a 200 OK w/ SDP and the 200 OK offer when passed from the Expressway-C to the Unified CM is too large. Expressway-E accepts the Cisco Webex certificate. At this point, you can conclude that the Expressway-E is routing the call correctly. Cisco recommends that you have knowledge of these topics: The information in this document is based on these software and hardware versions: The information in this document was created from the devices in a specific lab environment. The Hybrid Connectivity Test Tool checks if there is a valid DNS address, if Cisco Webex can connect to the port returned in the SRV lookup, and if the on-premises Expressway has a valid certificate that Cisco Webex trusts. Have the Expressway-E certificate be signed by a, Enter the required certificate information and ensure that the. 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. In the Certificates for Encrypted SIP Calls section select Upload. 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. Select the Hybrid Call Service Traversal client zone (naming will vary customer to customer), Select the Zone that's being used for the Hybrid Traversal Server, Set the SIP parameter preservation value to, User A makes a call from their on-premses phone to the Directory URI of User B, User B's on-premises phone and CTI-RD/Webex-RD accept the call, User B's on-premises phone begins to rings, User B's CTI-RD/Webex-RD forks this call out to the destination of UserB@example.call.ciscospark.com, Unified CM passes this call to the Expressway-C, Expressway-C sends the call to the Expressway-E, Expressway-E performs a DNS lookup on the callservice.ciscospark.com domain. You will find that the Hybrid Connectivity Test tool and any other tool used to check port connectivity will fail. Here is an xConfiguration from the problematic environment analyzed above. As expected, both the Search Rule and Traversal Server zone on the Expressway-E are configured correctly. Like all of other outbound forked call scenarios, the symptoms remained the same: Like all of the other scenarios, you can use the CUCM SDL traces along with Expressway-C and E diagnostic logs. To successfully establish a call with the Cisco Webex environment, one of these audio codecs must be used. 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. Switch Preloaded SIP routes support On to enable this zone to process SIP INVITE requests that contain the Route header. Since this particular issue isn't caused by the Cisco Webex environment or the on-premises collaboration equipment, you need to focus on the firewall configuration. If so, click the trash can icon next to the certificate. Note: It is important that the analysis is conducted and it is determined that the customer is not using the certificates uploaded to the Webex Control Hub prior to removing them. Set the Priority value to something lower than other Search rules, yet high enough so that it won't impact others. This error may occur if a Webex site is moved back to a previous lockdown version. 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. Note: If there is only one DNS Zone being used on the Expressway, a separate DNS Zone should be configured to be used with Hybrid Call Service that can take advantage of these values. If the Cisco Webex environment is unable to establish this TCP connection, the call inbound to the premises is subsequently fail. If you couple this with the statements from the Deployment Guide for Cisco Webex Hybrid Call Services, you would find that the Modify DNS Requestmust be set to On and the Domain to search for should be set to callservice.ciscospark.com. If this value is not present, the inbound call fails. b. There are several ways to verify if the Expressway-E is listening for Mutual TLS traffic over port 5062. As noted above, Cisco Webex will attempt to connect to the on-premises Expressway by performing an SRV lookup based on the configured SIP Destination that is listed in the Hybrid Call Service Settings page in the Cisco Webex Control Hub. The Cisco Webex server that is in direct communication with the Expressway-E is called an L2SIP server. As you can see in the snippet here, the handshake fails and the certificate is unknown (Detail="sslv3 alert certificate unknown"). and Features utility. In order toconfirm the configuration of this value, you can go to the Webex Hybrid DNS Zone that was configured for the solution. At this point, you determined that the Expressway-E server certificate needs to be signed by either a Public CA or an Internal CA. With the Cisco Unified Communications Manager (Unified CM), the default values to handle a large SIP message containing SDP in past releases were not. When you analyze packet captures, it's easy to get lost in the sheer amount of packets observed in a given capture. 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. Solution. As part of the mutual TLS handshake, Hybrid Call Service Connect uses TLS Verification. 2. is including its full chain involved in the signing. The problem is immediately after the dialogcompletes there is a BYE that comes from the direction of the Expressway-C as shown in the image. It's important to know that when a certificate is uploaded to the Cisco Webex Control Hub, that certificate takes priority over what certificate and chain the Expressway presents during the TLS handshake. Was the Cisco Webex certificate signed by a Public CA that is listed in the Expressway-E Trusted CA list? Here are some common Wireshark filters that can be used to get details about a mutual TLS handshake: From time to time, you might need to get a copy of a certificate (server, root, or intermediary). The xConfiguration can be leveraged to analyze this as well. As another approach, you can also look up the SRV record by using nslookup. Since the Expressway-E diagnostic logging is of no use in this situation, you have a few possible methods for verification: Since the Hybrid Connectivity Test tool is built right into the Cisco Webex Control Hub and simulates the Cisco Webex environment trying to connect to the on-premises Expressway, it is the most ideal verification method available. For more information about the SIP Destination address and/or SRV record that must be setup. The challenge is that the Unified CM never responds back with a SIP ACK as shown in the image. With this information at hand,you can conclude that Unified CM is sending an unsupported audio codec which is the reason the Cisco Webex is zeroing out the port. To test the TCP Connectivity into the organization: 6. Unified CM attempts the outbound call as DelayedOffer to Webex which means theinitial INVITe sent to the Expressway-C will not contain SDP. The program reaper.exe version 5.9.7.2 stopped interacting with Windows and was closed. From the root of the Expressway, if you issue netstat -an | grep ':5062' , you should get some output similar to what you see below. In this scenario, when the firewall tearsdown the connection, you see these errors within the diagnostic logging. This means you no longer have to set the TLS Subject Verify Mode and TLS Verify Subject Name. At that point, you can then issue the full SRV record you want to look up. By standardizing the recording format, you'll have a wider choice of playback tools, better security, and a more effortless collaboration experience even after your meetings. Video-Centric Network-Based MP4 Recordings in Webex Meetings and Webex Events, Install the Cisco Webex Network Recording Player for Advanced Recording Format Files, Announcements for the Cisco Webex Meetings Suite. Note: Currently, the Expressway/VCS diagnostic log bundle does not contain information about the Expressway Server certificate or Trusted CA list. One easy way to find it is to search on the port number you learned from the Expressway-E xConfiguration (SIP Port: "7003"). Cisco Webex has a full list of public CAs that it trusts. The certificate actually has 25 different SANs. You can see that the preferred audio codec is set to G.729 (Payload 18). 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. Expressway-E and the Cisco Webex environment begin a Mutual handshake, The Cisco Webex environment passes the call onto User B's available Cisco Webex app. As before, it was determined using the Expressway-E Search History that this call was arriving there and failing. Domain to search for (Translates toDnsOverride Name in xConfig). What this means is that any time you want to analyze a (mutual) TLS handshake that occurs over port 5062, Wireshark will not know how to decode the traffic properly. Recordings that have been created while the site was on a newer release will not be able to be played back (streaming) using the player on the lockdown version. Here is a snippet of the initial INVITE out to Cisco Webex. Start with the first SIP INVITE that comes into the Expressway-E to see what zone it came in over, which Search Rules are being used, which Zone the call goes out, and if sent correctly to the DNS zone, what DNS lookup logic occurs. Has the Expressway-E certificate been signed by one of the Public CAs that Webex trusts? If you take a closer look at this message, you can see that the audio codec was zeroed out. 6. What happens in this scenario is that you upload the Expressway-E server certificate (which has been signed internally) to the Cisco Webex Control Hub so that you can complete the mutual TLS negotiation successfully. 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. To determine the Device Pool of the Expressway-C SIP Trunk: To Determine the Device Pool of the CTI-RD or Cisco Webex-RD that Anchored the Call: Determine the Region attached to each Device Pool: At this point, if you identify the relationship that is using G.729, you'll need to adjust the relationship to support of the supported audio codecs that Cisco Webex uses or use a different Device Pool that has a Region that supports this. All rights reserved. In order to address thisyou need to set the TLS verify inbound mapping on the Hybrid Call DNS Zone to On. The on-premises environment can be setup to use many types of audio codecs but at the same time it can be setup to restrict them. Immediate Activation. In this particular scenario, the call originated from an on-premises phone. The Expressway-E has some type of firewall rules set up that could be blocking the traffic. In order to resolve this issue, the TLS Verify Subject Name must be modified: Note: See thefor baseline logging behavior. You can clearly see that the User-Agent is Cisco-CUCM11.5 which means that the message was generated by theUnified CM. Unified CM Max Incoming Message Size Exceeded, Expressway Connector Host Support for Cisco Webex Hybrid Services, Cisco VCS Expressway and VCS Control Basic Configuration guide, this section of the Hybrid Call Deployment Guide, Enable Hybrid Call Service Connect for Your Organization, Cisco Webex Hybrid Call Service Deployment Guide, Complete the Prerequisites for Hybrid Call Service Connect section, Deployment Guide for Cisco Webex Hybrid Call Services, Technical Support & Documentation - Cisco Systems, Knowledge of the Expressway solution (B2B), Knowledge of Cisco Unified Communications Manager (Unified CM) and its integration with Expressway, Expressway (B2B) version X8.7.1 or later (X8.9.1 is recommended), Use the Webex app as a mobile soft client for audio and video calls, Use the app to make and receive calls from anywhere, as if they were in the office, Use Webex, Cisco Jabber, or their desk phone to call, withoutthe need to worryabout which option they use, Unlock call history in on-premise phones and integrate that history in Webex. Expressway is not Mapping Inbound Call to Cisco Webex Hybrid DNS Zone, Issue 7. Having analyzed the diagnostic logging which isolated the problem to the Expressway-C and a specific error (404 Not Found), you can focus on what would cause this type of behavior. Using another Jabber/XMPP capable IM Client works but not using Cisco Webex Connect. If the call originated by an on-premises phone, you can expect that the Cisco Webex app would not ring. The Locate utility can be found on the Expressway under the Maintenance > Tools > Locate menu. Select the sub-menu, Audio. However, the lack of SSL error in the diagnostic log is an important data point. As you can see from this xConfiguration, this value is set to Off. This L2SIP server is to be signed by an intermediary server with a common name of Hydrant SSL ICA G2. 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