One sided echo on IP500 unit 6.1(22)

[ega218]

I have a remote user that VPN's back to the office and has a 5621SW IP phone. When callers from the main office and also those from other locations via our SCN call the remote user, the intermittently experience echo with the their voice. The remote users never has any issues and is unaware that the call or the other person on the other line is experiencing an echo. Some times when the call is hung up and a new call is placed, the problem is temporarily fixed. I have tried different compression modes, but the problem still persists.

The VoIP Silence Suppression & theEnable Fasstrat for non-Avaya IP phone is unchecked.

Would any adjustment to the TDM ->IP Gain or IP-> TDM Gain all on the H323 Extension fields.

Thanks in advance for your comments.

 

[ega218]

I forgot to mention that this is only for internal VOIP phone calls.

 

[tlpeter]

Is direct media path disabled? This should be the case with VPN phones.

BAZINGA!

I'm not insane, my mother had me tested!

 

[ega218]

Hi tlpeter,

Thank you for the suggestion. I have tried this, but the echo still exists. Actually, after making this change, not sure if it is associated to this, I am not hearing the echo as well. I did send a quick survey and found out that this is not isolated only to calls to the remote VPN user. However, this is also happening intermittently with IP calls internally in the same office.

I am now wondering if it is a sign of a VCM card starting to fail. I have the following in this office:

IP500
2 x VCM32 cards
Using SIP
40 users

Thanks again for your input.