Cisco Webex has a full list of public CAs that it trusts. 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. In packet number 56, you can see that the Expressway-E is sending the RST immediately after the initial TCP SYN packet arrived. 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. If so, click the trash can icon next to the certificate. The route header is populated based on the information that the Call Service Aware (Expressway Connector) portion of the solution delivers to Cisco Webex. Once this process is completed, you see that the full chain of certificates involved in signing the Expressway-E server certificate included in the key exchange. For our organization, we can share our screens, but some users are able to give/receive remote control access and others aren't. For example, when I am screensharing with coworker A, I can give them access, but 5 minutes later when I screenshare with coworker B, I cannot give them access and they cannot request it. 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. If you're having trouble finding the search rule. 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. Within this xConfiguration, you can look for the Search Rule that should pass the call out to the Webex Hybrid DNS Zone. At this point, the entire stream shows the certificate and error messages exchangedat the time ofthe handshake as shown in the image. However, Hybrid Call Service Connect intended to use TCP port 5062, not 5061. This can happen intentionally or unintentionally by the use of custom and/or default region settings on the Unified CM. By design, the Expressway-E only sends its certificate during a TLS handshake despite being signed by a public CA. Below is a sample of the search rule logic that the Expressway was performing. 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). 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 also request access keyboard and mouse control while they're sharing their screen. In most circumstances, you can leverage the xConfig of the Expressway to better understand the circumstances. To successfully establish a call with the Cisco Webex environment, one of these audio codecs must be used. Next, select the names of attendees you want to provide remote control access to Click on "Grant Control" when the message pops up on the screen This is a "received" action and it is coming from the Expressway-C IP address. This L2SIP server is to be signed by an intermediary server with a common name of Hydrant SSL ICA G2. Allowing remote control of mouse and keyboard and while sharing the screen in WebEx Teams - and similar to the implementation already in WebEx Meetings - would be outstanding and a due feature, IMO . There are several ways to verify if the Expressway-E is listening for Mutual TLS traffic over port 5062. 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. For more information on the CPL implementation for Webex Hybrid refer to the Cisco Webex Hybrid Design Guide. Some things to consider are the following: You can now use the xConfiguration to view the configuration on both the Expressway-E Traversal server and Expressway-C client zones, specifically those that are set up for Hybrid Call Service Connect. Below is an example. Cisco Webex sends an inbound INVITE w/ SDP that is too large. 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. As part of the mutual TLS handshake, Hybrid Call Service Connect uses TLS Verification. You will find that the Hybrid Connectivity Test tool and any other tool used to check port connectivity will fail. Example of the Expressway-E that conducts a SAN inspection of Cisco Webex's server certificate. To do that, you can revisit the xConfig this time looking for the Search Rule named "to DNS". After the SIP dialog times out, Cisco Webex will send an Inbound SIP 603 Decline message to the Expressway-E as noted in the log sample. In the Call Service Connect section enter, In the Call Service Connect section enter the, Get a packet capture off the outside interface of the firewall, In the Call Service Connect section ensure the value entered in the SIP Destination is correct, The SIP FROM field will be formatted with the. Verify user has Wxc licenses assigned. Once you have identified the SIP INVITE for the Inbound call, you can then locate and copy the SIP Call ID. The steps below illustrate how you can adjust the logging levels of the developer.ssl module which is responsiblefor providing information for (mutual) TLS handshakes. As nearly every other inbound Hybrid Call Service Connect call setup failure, the symptom is that the on-premises phone does not ring. 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. In this particular segment, you will walk through an outbound call that is failing. As before, you should reference the for leveraging Search History and tips for identifyinga call in the diagnostic logs. You must switch the Preloaded SIP routes support to On. 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. With the use of the diagnostic logs from the Expressway, you can look for the attempted Mutual TLS handshake. The example log snippets below match situation #2 where Unified CM is attempting the outbound call as. Teams sends a notification to that person to let them know you're sharing control. Here is an example of a successful Check pattern test as shown in the image. If so, you will likely want to start your investigation there. At this point, the call must route through the Expressway and be sent out of the Webex Hybrid Traversal Server zone. What to do next. 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. From the partner view in https://admin.webex.com, go to Customer and click on a customer. The Expressway-C sends this 200 OKto Unified CM but Unified CM is only configured to only allow G.729 for this call. In the xConfiguration the, the domain used for the public SIP SRV address, Configure the SIP Destination to be formatted as. Because the issue was isolated, this data should be provided to the customer's network administrator. 5. For clarity, the log samples provided in this illustration matched situation 3 where the call was sent outbound to Cisco Webex as Delayed offer. This section shows the Expressway performing certificate verification and the mapping to the Webex Hybrid DNS Zone. 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. Double-click the saved file to open the certificate as shown in the image. ), if Cisco Webex doesn't trust the Expressway-E certificate, you must see some type of SSL disconnect reason. Here are the commands you can run to verify if the SIP Destination exists. 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. By click the Webex server certificate and expanding it to see the Subject Alternate Names (dnsName)you can verify to ensure it has callservice.ciscospark.com listed. Guest commented. When requesting a list of resources the max query parameter may be used to control the number of items returned per page. 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. If you focus on the xConfiguration of the Expressway-C, you can start by looking for the Traversal Client zone for Webex Hybrid. 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. Provide the CSR to a 3rd party Public CA for signing. There are two methods that you can use the decode this traffic so that you can more easily see the certificate information and any error messages that are present. anchor. Call FlowNavigate to Cisco Webex app > Cisco Webex environment > Expressway-E > Expressway-C > On-Premises Collaboration Endpoint/IP Phoneas shown in the image. Symptom: Webex Control bar with open Invite panel is splitting in two parts between screens, displaced or missing a part in Webex Support.Conditions: When you start a a web ex support session om device with external monitor and request desktop view from participant. 4. Step 1. In the Call Service Connect section verify, If the record has been entered correct, click. When you look at the Cisco Webex certificate that is passed, you can see that it sends the full chain. This scenario articulates issues and challenges observed with the Expressway prior to x12.5. From time to time, you may need to adjust a logging level of a particular module from INFO to DEBUG to get a better understanding of what is happening. Search for the Device Pool used for the Expressway-C SIP Trunk. Issue 1. Therefore, when the call is offered to the CTI-RD or Cisco Webex RD, the call is sent back out to Cisco Webex because the device has a Remote Destination configured for bob@example.call.ciscospark.com. Choose the Internal CA and Expressway-E certificates. It can take up to 15 minutes to hide your availability and custom status. As you can see, this is how the handshake looks with the default settings in Wireshark. Additionally, if they need more information, you can take a capture off the outside interface of the edge device and/or firewall for further proof. By changing the Device Pool the Expressway-C trunk was in, you change the Region relationship. 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. Another quick way to understand how far the call is getting within your on-premises environment is to use the Expressway "Search History". So, Unified CM will reject the call due to no available codec. Webex App takes your privacy seriously. WBS41, 42 For: User Subscribe January 20, 2023 | 67119 view (s) | 380 people thought this was helpful Provide or request remote control in Webex Meetings, Webex Events (classic), Webex Webinars, and Webex Training sessions This option is primarily intended for use with Cisco Webex Call Service. Like all of the other scenarios, you can use the CUCM SDL traces along with Expressway-C and E diagnostic logs. Expressway-E is Signed by Public CA but Cisco Webex Control Hub has Alternate Certificates Loaded, Issue 6. This will give us an idea if the Expressway-E is manipulating the INVITE in any way. Locate the packet that is sourced from the Webex server address and has Certificate printed in the Info section. The challenge with this is that the Deployment Guide for Cisco Webex Hybrid Call Services doesn't explicitly call out the use of port 5061 because some environments do not allow business to business calling. When you analyze packet captures, it's easy to get lost in the sheer amount of packets observed in a given capture. 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. However, you can't determine that without the traffic beingdecoded. When this condition is met, you can see an error similar to this within the diagnostic logging: If you use Wireshark to analyze this certificate handshake, you can find that after Cisco Webex presents its certificate, the Expressway RSTs the connection shortly after as shown in the image. The Expressway-E's firewall functionality exists under System > Protection > Firewall rules > Configuration. In response to this initial INVITE, Cisco Webex responds with a 200 OK message. 22 6 Unable to register SX80 to Webex Control hub - 'The activation service requires an encryption option key' Go to solution Knowlesy14 Beginner Options 08-07-2018 06:00 AM - edited 03-18-2019 02:17 PM I'm trying to register a SX80 via the Webex Control Hub (admin.webex.com). As you can see in the snippet here, the handshake fails and the certificate is unknown (Detail="sslv3 alert certificate unknown"). Based off these definitions, the xConfiguration, and that the. Expressway-EusesDefault Self-Signed Certificate, Issue 1. 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. 2. The hostnamel2sip-cfa-01.wbx2.com resolves to 146.20.193.64. 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. The Search Rule had a priority of 90 and was targeted to go to theHybrid Call Services DNS Zone. 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. While you're sharing control, they can make selections, edits, and other modifications to the shared screen. 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. 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