A remote Router 3825 with an ISDN PRI PSTN Link that connects through the WAN (Dedicated Link) to another 3825 at the local site. On the local site we have a Call Manager 4.2(3), IP IVR 4.0(4) and IPCC 7.2(5). The calls are being routed correctly from the remote site, through the WAN to the IP IVR and the IVR message is heard perfectly, but when the call gets transfered to an agent, there is a loud background noise (heard only by the caller, not the agent), which happens randomly. If the agent puts the call on hold, and resumes it right away, the background noise goes away.
The dial-peer configuration on the remote router are as follows:
dial-peer voice 1000 voip
translation-profile outgoing XXXX
voice-class codec 1
voice-class h323 1
session target ipv4:IP Address of the Call Manager
Putting a call on hold and then resuming actually re-establishes the RTP stream between the two endpoints. If it seems to happen randomly, then perhaps you need to look at your QoS and jitter. It is possible you are dropping packets or they are getting delayed. Check your call volume when it occurs, I'd guess that busy-hour of the day is likely when it occurs.
While I cannot reference any particular bug in 12.4(22)T or T5 that would be affecting you, I can say it has not been my favorite IOS for voice. If you have 512MB of DRAM in your two 3825 routers (or can add DRAM to bring them up to that level), I'd highly suggest moving to the latest 15.0(1)M release. I've had very good results using that IOS with customers who have a high call volume (12,000 calls a day) and have been running it for over a year now with no issues.
P.S. When I wrote this 15.0(1)M7 was the latest release.
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