[asterisk-users] 1.8.3 - IAX - echo - jitterbuffer

[Tim Panton]

On 8 Mar 2011, at 02:12, sean darcy wrote:

> On 03/07/2011 05:26 PM, Kevin P. Fleming wrote:
>> On 03/07/2011 04:15 PM, sean darcy wrote:
>>> I'm using iaxagent on a Droid X to connect by IAX to 1.8.3 at the
>>> office. 1.8.3 has sip phones. The audio is fine on the Droid X side. On
>>> the office side, they hear an echo of _their_ speech, not mine.
>>> 
>>> The office uses sip-providers generally without any echo problem.
>>> 
>>> Where do I start to figure this out? How do I narrow it down? Can I
>>> figure out if it is an iaxagent problem? Could using jitterbuffer cause
>>> this?
>> 
>> This is probably acoustic echo from your phone. The jitterbuffer has
>> nothing to do with this.
>> 
> 
> Yup. Turning down the volume on the call reduces the echo. Of course, now I can barely hear the office!
> 
> I can keep the volume up on standard calls from the Droid X, which suggests that Android has some echo cancelling on phone calls.
> 
> I'll try to see if the developer of iaxagent can do anything.
> 
> BTW, if you haven't, try iaxagent on your phone. It's a very clever use of the iax protocol and leverages iax's strengths. iax makes a lot of sense on mobiles, dealing with the NAT issues from inconsistent access points easily.
> 
> Thanks for the help.
> 
> sean


Anyone know how iaxagent is accessing the speaker/mic ?
In theory the phone should have echo cancellation built-in, but it may only be enabled in
certain cases.

T.


Tim Panton - Web/VoIP consultant and implementor
www.westhawk.co.uk