Cisco Call Manager and MS Teams Call Park 1 Way Audio

[Dhargett]

I have configured my Cisco Unified CM and MS Teams client for Direct Routing and am able to send and receive calls with no issue through the SBC

However when I place the call on park and pick it back up the person parked is the only one sending audio and the Teams user is silent.

I've looked through the documentation for Direct Routing and cant find anything that could cause the issue.

Any help is appreciated!

[Jonas Fraga]

Hello @Dhargett 

Without SIP dialog will be hard to identify the cause, but maybe could be a UPDATE message issue where MSFT Teams are not processing after picking from park, so it will not reopen the channel keep the call "on hold".

As soon as PARK by default send messages notifying that call are putting on hold maybe a solution for that are not notifying MSFT Teams that call are on hold (but keeping MoH, of course).

You can do that by blocking sending update messages on specific dial-peers.

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/voi-cube-edupdate-block.html#task_6F344CFF9156472597C140063A081B74

Other way are to enable on CUCM Duplex streaming to prevent "closing channels" when call are putting on hold.

https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/212640-troubleshoot-music-on-hold-failure-when.html

To really know what are happening the best way it should analyze: SIP Dialog from CUBE, Callmanager logs from CUCM, Any SIP Dialog from MSFT Teams.

Hoping that's be helpful.