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New Member

Repeating Voice?

Has any one had a user complain about a call where bits of the person at the other end repeats itself... I have one user who said he has had a few calls where the person's voice has repeated several times but the other person was not repeating... Could this be some form of Jitter?

9 REPLIES
New Member

Re: Repeating Voice?

I have a customer complaining of this same problem. Have you found any resolution, or does anyone out there have any ideas?

New Member

Re: Repeating Voice?

No I have not heard anything on this issue. I asked the user to document when it is happening so I can check network congestion and such...

New Member

Re: Repeating Voice?

We occasionally have calls that start distorting briefly and/or retransmitting portions of the conversation from the non-ip side. Since UDP doesn't retransmit lost packets, I am at a loss of how this could occur.

New Member

Re: Repeating Voice?

I have had this problem. We use IP phone and it calls across the wan to an h.323 gw to fxs port. The IP phone will hear sometimes the other party repeat. I have a tac case open and they found that some of the timestamps are missing. Example: timestamps go 1,2,3,20,21,22,23. 4-19 are missing. The buffer starts to buffer and then fills. When it gets full it has to send to the packets. This has created delay as well for us. I was able to send a sniffer trace off the phone to tac. They could then listen to the call and heard the repeat. They think they found the issue for us. It has to do with having caller-id enabled on the fxs ports? I still have this case open trying to get a resolution. Our workaround is turn caller-id off. You may try that if this applies to your config. I still do not understand why the call repeats.

New Member

Re: Repeating Voice?

Would it be possible for you to post the case number. I am working on a similar problem with my local SE and it might help if he can talk to the TAC engineer working on the case. Our problem involves FXO ports connected to the PSTN and the IP phone user will hear the far end voice repeated for about 1 second at various points during the call.

New Member

Re: Repeating Voice?

Jeff

Can you provide more information about the local setup where this problem is happening?

I experienced something similar. I had a 3640 router where there were a high number of errors occurring on the Ethernet interface in full-duplex mode. This produced a variety of problems for Voice traffic, most notably during periods of high traffic through the router. In one instance, the majority of calls inbound to a particular user produced an echo (repeat) of the IP phone user's voice as much as two seconds later.

New Member

Re: Repeating Voice?

The LAN infrastructure consists of 3524-PWR switched with 1000BaseT uplinks to a 3550 that is doing the routing for all the VLANs. The site is relatively small, under 40 phones and maybe that many workstations. The 3660 is connected to a port on one of the 3524s. The port is 100Mb/full duplex and there are no errors or collisions on the port. Thanks

New Member

Re: Repeating Voice?

Hi Jeff,

I have a customer experiencing the same problems with repeating words and also some lost words. All the problems are on the IP phone side.

CM3.2.2c SPG, VG200-PRI-MGCP 12.2.13T1

TAC currently is working on a few traces I sent them.

Did you find the source of your problem??

While waiting for TAC, we did back track on the phone load from P00303020215 to P00303020204 as well as replace the

vg200-PRI-MGCP with an old DT-24+ from my lab. No problems reported since we made these two changes. We are still

working on pin-pointing the exact source of the problem.

Thanks for your input,

Eric Morgan

New Member

Re: Repeating Voice?

I never did find the source and the issue never showed up again. I would be interested to know what TAC finds...

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