[asterisk-dev] In call Codec parameterization in 1.6 ?

[Paul Cadach]

Hello,

Echo cancellation isn't job for codec, which should be ALWAYS enabled at user's side, but softphones usually don't
implements acoustic echo cancellers. To resolve echo problem you should use some sort of headphones instead of
"handsfree" operations (using microphone and speaker).

Choosing of right codec is main job for Asterisk and it is not required any inband/outband interactions with client side
(except for requesting to re-open media channel with right codec). Currently codec selection isn't work very well and
periodically causes some sort of problems, but it should be fixed in near future (for example, check #4825 at
bugs.digium.com).


WBR,
Paul.

----- Original Message ----- 
From: "Tim Panton" <tim at mexuar.com>
To: "Asterisk Developers Mailing List" <Asterisk-Dev at lists.digium.com>
Sent: Wednesday, November 01, 2006 2:10 AM
Subject: [asterisk-dev] In call Codec parameterization in 1.6 ?


> I have a problem I'd like to see solved in 1.6, so now seems a good
> time to bring it up.
>
> Basically I want to be able to send codec configuration messages
> during a call.
>
> The scenario is this:
> Softphone user calls in to a call center using a laptop with builtin
> mike and speakers.
> Call center agent hears echo
> Agent clicks a button sending message to Users softphone
> Softphone gets message and enables echo can.
> Call proceeds.
>
> I want to carry the message in-band to indicate to the transmitter
> the dynamic preferences
> of the receiver.
>
> I can imagine this sort of thing would also apply
> to video and shifting from wide to narrowband versions of a codec (eg
> AMR)
> based on the _recipient's_ perception.
>
> I'm most interested in IAX, but a generic solution would be ideal.
>
> At the moment I'm looking at using TEXT messages, but that doesn't
> feel quite right.
>
> Tim Panton
>
> www.mexuar.com
>
>
>
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