asterisk users - Mar 2006 - Polycom hand/head set echo and Zapata config

Hey everyone,

I have been trying to figure this out and I am just getting no where 
with it. The office is using Polycom IP 601 phones. Everything sounds 
great in terms of quality on both heads. However, users of the phone are 
having trouble with their headsets and handsets. Some users are hearing 
their voices back come back on the phone. If they adjust their volume 
lower, then it goes away, but then they can hardly hear the customer.

I have tried using the noise suppression and cancellation features on 
the sip.conf for the phone but that hasn't worked either. Has anyone had 
this before and have you found a way to adjust the phone to cancel the 
echo? Or am I wrong and it isn't the phone but the zapata.conf for 
asterisk or the TDM card? Is there a way to boost the volume of the 
caller without adjusting the phones? For example the rxgain and txgain 
in the zapata.conf file.

Any suggestions would be greatly helpful.

Thanks,
Kevin

Kevin, try lowering the gains on heads and handset directly on sip.cfg or
macaddress.cfg for each polycom phone.

If you want to change it for all, modify directly on sip.cfg on the ftp site
where the phones grab their configs from each time they boot, the setting to
check is:

voice.gain.rx.digital.handset="-9"
voice.gain.rx.digital.headset="-21"
voice.gain.rx.digital.chassis="-9"

Try using -X numbers

You can also try playing around with AGC (automatic gain control) AES
(automatic echo suppresion) and AEC (automatic echo cancellation)
Just change enable to 1 without chaning the parameters, see how it goes.

Hope this helps.

|-----Original Message-----
|From: asterisk-users-bounces@lists.digium.com 
|[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of 
|Kevin Smith
|Sent: Tuesday, March 21, 2006 4:36 PM
|To: asterisk-users@lists.digium.com
|Subject: [Asterisk-Users] Polycom hand/head set echo and Zapata config
|
|Hey everyone,
|
|I have been trying to figure this out and I am just getting no 
|where with it. The office is using Polycom IP 601 phones. 
|Everything sounds great in terms of quality on both heads. 
|However, users of the phone are having trouble with their 
|headsets and handsets. Some users are hearing their voices 
|back come back on the phone. If they adjust their volume 
|lower, then it goes away, but then they can hardly hear the customer.
|
|I have tried using the noise suppression and cancellation 
|features on the sip.conf for the phone but that hasn't worked 
|either. Has anyone had this before and have you found a way to 
|adjust the phone to cancel the echo? Or am I wrong and it 
|isn't the phone but the zapata.conf for asterisk or the TDM 
|card? Is there a way to boost the volume of the caller without 
|adjusting the phones? For example the rxgain and txgain in the 
|zapata.conf file.
|
|Any suggestions would be greatly helpful.
|
|Thanks,
|Kevin
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