I just installed 3.1 on our CallManager and ever since then I have had a real bad echo problem on the system. The echo is most notable when it comes through the link (DT-24PIR card) to the NEC 2400 to pick up a out side trunk line. To some degree from
call made from IP phone to IP phone in the same call manager. The volume to and from the callmanager is affected to some degree.
I have tried everything I can think of, read all I can find on the Cisco Web Site about echos, and have a ticket opened with Cisco Tac to date nothing has worked. Tac did send me a lode to fix a "audio level adjustments not working on the DT-24+" problem,
and I still have the echo. I have adjusted the levels of input to and from the IP network to -6dB.
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The phone to phone echo is most likely CSCdv05172. I have heard they are working on a load that will put echo cancelation into the handset and headset of the 7960 phones. This should help but will not be available until sometime in Feburary at the earliest. What load are you running on the DT-24+? Right now when you adjust the db levels does the voice get louder or softer or does it stay the same.
I feel your pain. I have a DT-24+ connected to a ROLM PBX and I have been getting it ever since the upgrade to 3.1. I have tried everything possible too, read everything on CCO, adjusted the volume, changed the loads, tried every level of dB into and from the network and I still have a TAC case open without resolve.
I think it's ridiculous to have to wait until February to get the fix. I've been getting beat up daily to get this resolved. I have delayed futher deployment of IP Phones until it is resolved.
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