[Asterisk-Users] troubleshooting echo on speakerphone

[Colin Anderson]

Different room. Different acoustic characteristics. 

-----Original Message-----
From: T. Shaw [mailto:xytek at hotmail.com]
Sent: Friday, June 23, 2006 12:21 PM
To: asterisk-users at lists.digium.com
Subject: RE: [Asterisk-Users] troubleshooting echo on speakerphone


ok, ill try that as well. Funny thing is i don't have these issues using the

same phone on my test box at home which is a old 256M Sun Ultra5 connected 
to a old Netgear Cable/DSL wireless router (can you say 0 (zero) QOS).

Terrelle




>From: Colin Anderson <ColinA at landmarkmasterbuilder.com>
>Reply-To: Asterisk Users Mailing List - Non-Commercial 
>Discussion<asterisk-users at lists.digium.com>
>To: 'Asterisk Users Mailing List - Non-Commercial 
>Discussion'<asterisk-users at lists.digium.com>
>Subject: RE: [Asterisk-Users] troubleshooting echo on speakerphone
>Date: Fri, 23 Jun 2006 11:59:03 -0600
>
>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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