On Mon, May 07, 2007 at 02:45:48AM -0500, Eric ManxPower Wieling wrote:
> syd wonder wrote:
> >Hi all. I'm trying to hook into a chan_zap.c function that enables echo
> >cancellation. I think I've identified the spots to hook into but am
> >wondering if someone can answer a few questions or provide some guidance.
> >
> >1 - I'm using an external device (Sipura SPA3000 FXS/FXO) configured as
> >a SIP trunk. I'm hoping that along with the Chan_Sip.C file, that the
> >Chan_Zap.c file is used to setup some of the functionality, namely -
> >whether echo cancellation should be enabled
> >2 - With item 1 being true, the reason why echo cancelling is not being
> >enabled is because the external device is being recognized as a digital
> >channel.
> >
> >Anyone have a suggestion as to whether these assumptions are true? If
> >not, any suggestions how I can add the echo cancellation functions to
> >non-zap devices. This is something a bit more interesting now that
> >Octastic has released their SoftEcho software. Thanks.. Syd
>
> Generally, once the audio is converted to VoIP audio latency is far too
> high for echo canceling to work. Echo needs to be canceled BEFORE the
> call is converted to VoIP.
So a PRI card with echo cancelling won't help local SIP phones, right?
--
Tzafrir Cohen
icq#16849755 jabber:[EMAIL PROTECTED]
+972-50-7952406 mailto:[EMAIL PROTECTED]
http://www.xorcom.com iax:[EMAIL PROTECTED]/tzafrir
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