[Asterisk-Users] troubleshooting echo on speakerphone

[Colin Anderson]

Sounds like a reflection echo i.e. the customer's voice is coming out of the
speaker, hitting a flat wall, and is being picked up by the mic on the
speakerphone. Try attenuating the microphone, or to test for it, move the
speakerphone to a smaller room or one with fabric walls like a cubicle.
Dollars to doughnuts, it goes away. 

As to the stuttering, it is most likely because the audio is being
suppressed during speech or turned to half-duplex, which speakerphones are
notorious for. Speakerphones, voip or not, are tricky beasts and I try to
discourage their use amongst my users whenever possible. I personally
dislike speakerphones; I consider them rude. 

-----Original Message-----
From: T. Shaw [mailto:xytek at hotmail.com]
Sent: Friday, June 23, 2006 11:48 AM
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] troubleshooting echo on speakerphone


Hello all,
I'm looking to troubleshoot some echo issues and possibly "studdering" while

using the speakerphone with the Intellitouch ITC3002. On the hardware end, i

have a 2621 setup as the router with some policy maps for qos, and a 2900XL 
with cos priority set to 5. I have setup created 2 vlans currently (really 
small office), 1 for corp/data, and 2 voice vlan. Asterisk is on the 2nd 
vlan as well as the phones and i have the 2621 doing intervlan routing.

Currently we have VOIP calls coming in and out, but when calls are placed 
and speakerphone is utilized, the FAR end hears echo of themselves. This 
would happen regardless of who placed the call.

Any ideas on where i can start cutting down the echo problem?
The phones come with echo-cancellation and is turned on. Thephones also have

VAD but is currently not on. Would this make a difference while utilizing 
the speakerphone?

Terrelle


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