Hi Was hoping someone could point me in the right direction. using asterisk cvs in various VOIP configurations On a call when the loudness of transmit > receive then all receiving is null. In practical terms this causes background noise (from the other end)to stop when you are talking and come back on when you are quieter. Often causing background noise to seem like it is switching on and off as you speak during a call similar to if you were using a CB radio. in testing calls: transmit = null receive = steady noise (generated from the other end) transmit = quiet receive = steady noise (generated from the other end) transmit = normal/high receive = null Does this seem like it is echo cancellation related? Any pointers as to what topic this sort of thing would fall under? Thanks Jack __________________________________ Yahoo! Messenger Show us what our next emoticon should look like. Join the fun. http://www.advision.webevents.yahoo.com/emoticontest
Eric Giesselbach
2005-Apr-01 07:29 UTC
[Asterisk-Users] Maybe an echo cancellation problem?
Jack,
Several voip clients can optionally suppress silent packets. If no voice is
detected, rtp packets are kept back. This saves bandwith but can disturb a
conversation ("Hello John, still there?"). Softphone XLite has this
option active by default.
Search for options like "silence suppression", "noise
cancellation" or "voice detection" in your voip client.
Eric.
> -----Original Message-----
> From: 1 2 [mailto:vortex_0_o@yahoo.com]
> Sent: Friday, April 01, 2005 3:46 PM
> To: asterisk-users@lists.digium.com
> Subject: [Asterisk-Users] Maybe an echo cancellation problem?
>
>
> Hi
>
> Was hoping someone could point me in the right
> direction.
>
> using asterisk cvs in various VOIP configurations
>
> On a call when the loudness of transmit > receive then
> all receiving is null.
>
> In practical terms this causes background noise (from
> the other end)to stop when you are talking and come
> back on when you are quieter. Often causing background
> noise to seem like it is switching on and off as you
> speak during a call similar to if you were using a CB
> radio.
>
> in testing calls:
>
> transmit = null
> receive = steady noise (generated from the other end)
>
> transmit = quiet
> receive = steady noise (generated from the other end)
>
> transmit = normal/high
> receive = null
>
>
> Does this seem like it is echo cancellation related?
>
> Any pointers as to what topic this sort of thing would
> fall under?
>
> Thanks
>
> Jack
>
>
>
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Thanks for the pointers. I have confirmed that Voice detection is disabled and echo cancellation/suppression settings are disabled on the voip client (Polycom) The best way to describe it is half duplex audio when transmit is greater than receive. Anything else I could look into? I also came across http://www.voiptroubleshooter.com/diagnosis/usersymptoms.html Although I couldn't find a matching problem it seems usefull none the less. J. __________________________________ Yahoo! Messenger Show us what our next emoticon should look like. Join the fun. http://www.advision.webevents.yahoo.com/emoticontest