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.
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