[asterisk-dev] Adding Octastic Soft-Echo to external SIP adapters

[syd wonder]

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

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