[cisco-voip] Unity Connection SRTP w/ CUCM SIP integration stops working & requires port group reset

[Dave Goodwin]

Dave, perhaps this is some variation on CSCuv04949 or CSCtr50458. I'm not
sure if you're using SRTP for the media, or just using SIP/TLS for the
signaling with RTP media. In any case, if you look at the list of caveats
in the CallManager 10.5(2)SU3a release notes - yes the CallManager release
notes - you'll see a handful of TLS and SRTP related caveats resolved,
especially in the ES train upon which the SU3a build is based. I am
referring to the section entitled "Resolved Cisco Unity Connection Caveats
in 10.5(2)ES55; base ES for 10.5(2)SU3"

You might wish to try pulling up the Mixer and/or CuCsMgr logs for a call
while it's working and when it begins to fail and attempt to look for any
errors yourself. But in any case, it sounds to me like a TAC case is in
order and prepare to supply them the logs if possible.

Regards,
Dave

On Fri, Jun 10, 2016 at 10:52 AM, Dave Wolgast <dwolgas1 at rochester.rr.com>
wrote:

> Unity Connection 10.5(2)su2
> CUCM 10.5(2)su2
>
> We have a secure SIP integration set up between CUCM and UCxn, which
> works...for awhile.
>
> After some number of hours/days, we stop getting rtp. The SIP setup
> happens exactly as expected, and the devices think that a call is
> happening, but the caller hears no audio...just dead air for the duration
> of the call. We are preferring g.711u but allowing g.729.
>
> We temporary fix we have been using has been to remove the g.729
> advertisement from the port group, reset the port group, then replace the
> g.729 advertisement and reset again. Reset itself doesn't seem to fix it,
> though I am not sure that there is anything specific about changing codec
> advertisement that is fixing it either.
>
> Regardless, after awhile, it stops working again.
>
> None of the publicly-visible defects seem to apply. Has anyone seen
> anything like this? Any tips for further troubleshooting?
>
> I just wanted to check with the experts before opening a TAC case.
>
> Thanks!
> Dave Wolgast
> Livonia, NY
>
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