Jabber client - encryption of VCS Expressway with MRA

Hi all

I'm working on the implementation of MRA for a video solution existing. Version CUCM is 9.1.2 (no IM & P server), vcs - c and vcs-e 8.2.2.  Client Jabber is 11.5.x

I finished most of the introduction and I am able to call internally and externally through MRA.

I still have a few things to tweak.  One is the encryption of video calling once jabber connects from outside.  From my understanding, the thigh jabber call end point and VCS Expressway uses TLS. But when I run wireshark on the PC with Jabber client, I don't see the RTP stream as being encrypted.

CUCM my jabber device does not use a secure profile.  Is it ok or not?

Please let me know if more are needed.  Thank you

You can confirm the call is encrypted from the client of jabber MRA by doing as follows (I used 11.5 jabber client, if you are using an older client, I can't guarantee this method):

1. make a call from the client jabber ARM, once the call is configured and media is established, you can end the call.
2. create a jabber client problem report (help > report a problem...)
3. Enter the required details and save the .zip file.
4 extract the file "jabber.log" from the .zip file. Since this file (at least since the version of client jabber 11.5) has the SIP messaging included in this document, you can use TranslatorX to view the file (you can also use a text editor if you wish).
5 generate a diagram of the log file.

6. in the diagram of the scale, you should be able to locate the origin of the call. Search for an invitation, in my case a "RE-INVITE" and select it. A pop-up window will appear with the details of the SIP message.

7. read the content of the message prompt of the SIP protocol (focusing on the SDP - the component of negotiating media). I won't go into detail about how to read SIP messages (there's a good article here, it is not for jabber specifically, but the same concepts apply).

8. close the prompt message and open the message 'OK w/SDP' to examine the response of the VCS-E. The SDP response, we can confirm that the encryption settings have been accepted for the media (media will be encrypted).

For re - apply point Jamie, unless you run CUCM in mixed mode and using security profiles, signalling/media encryption stops on the thigh of CUCM/endpoint and the VCS - C respectively. See the diagram below for reference (mixed mode not implemented).

You need not applied to the device of CSF security profiles to obtain the encryption between the client of jabber MRA and the VCS-E. If you can decode signaling and media packets in Wireshark your jabber client, you probably will not connect via ARM (ARM is always encrypted).

Please let us know if that helps.

-Jon

Tags: Cisco Support

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