Problems with mutiple simultaneous Calls on 4-Port FXO and 2801 VGW

[a.mehmood]

Hi,

I've a 2801 VGW with VIC2-4FXO card installed. VGW is configured as H.323 GW. Every thing works fine as long there is a single call on the FXO Port. But as soon as a second call has been made, the quality of the second call is realy bad, a lot of echo and the speech quality is like somebody talking on the "walkie talkie". I've tested a lot of echo cancellation config with input gain, attenuation etc. also Echo Canceler Enhancements. But nothing helped.

Below given is the config of one of the voice-ports:

voice-port 0/0/0

translation-profile incoming incoming

input gain -3

no vad

no comfort-noise

Any Idea? Any solution would be highly appreciated.

reagrds

[paolo bevilacqua]

Hi,

have you tried the procedure detailed in this document ?

http://www.cisco.com/en/US/tech/tk652/tk701/technologies_tech_note09186a0080477a06.shtml

seems too bad to be an impedance problem, but worth to try.

[a.mehmood]

thx for your quick reply.

But as you said, doesn't seem to be a impedance problem. Because all works fine as long one call is active.

But I'll surely do that testing, who knows :)

regards