I have a fairly complicated environment that has a mix of Cisco, Nortel, and a SIP Gateway provider (AudioCodes). I have a few instances where calls between the devices drop after about 16 minutes. The time is very consistent - depending on how I measure - it is between 15 min 45 sec and 16 minutes.
Only a select few devices (a 7936 Polycom and a call handler out of Unity Connection) experience the issue. Atleast this is all that has been reported thus far.
I can re-create the issue consistently. I am looking at the Cisco side because most other devices work over the same path.
Thanks for any suggestions you can lend.