I have just ONE user who is experiencing intermittent choppy audio while on both active calls and with their voicemails left with unity. From what this user reports, it only occurs with calls outside (from the gateway) the organization. Only occurs a couple times a week. Any ideas?
Thanks, Tim. Yes, I have gone through some of thjose basics. The part that led me away from the actual phone/switchport was the voicemial quality on unity. The user forwarded me a vmail and it was very choppy. So at this point I was thinking the issue was between carrier-GW-local switch (since the user experienced it on a call and it was same way in unity.) I have asked other users and no one reports the same issue. Strange it is locallized to just one.
Apparently it is choppy on voicemails and active calls. Only from the outside, though. I noticed two things on the gateway. I have two PRI out to the PSTN. The Serial 0/0/0:23 and Serial 0/0/1:23 which I believe is the signaling channel for both of the lines have a high number of CRC input errors.
The other thing I also noticed is there is no "no vad" on any of my dial-peers.
I would disable VAD. Like I said, most users hate it, it sounds wierd.
Technically you might use it if you were really trying to save bandwidth... it doesnt send any packets during silence in a call. But you should be provisioning enough bandwidth for each call these days anyway.
That said... VAD should not be causing you any quality issues.
So S0/0/0:23 has CRC errors but the other circuit does not?
Did you try the clear counters? And see if they increase rapidly?
You need to try and isolate the problem here.
Have you tried a new cable?
Then do the same.. clear counters and see if they increase rapidly again.
I'm not sure on your config, but you may even be able to swap the circuits between the 2 interfaces and see if the errors transfer..
Could also be a faulty interface card.. test above should help isolate that.
I would try the cables first.
If that doesnt help.. get the telco to check out the circuits. They should be able to do a loop and test to isolate the cause.
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