Hi!
I have a sangoma A104d and have some questions about the echo canceller.
Maybe someone can answer by questions.
1. EC can be activated with wancfg and in /etc/asterisk/zapata.conf.
What is the difference? I have some suspicions - can someone confirm or
correct this?
wancfg: hw echo cancel = yes
zapata.conf: hw echo cancel = yes
chan_zap activates an echo canceller. As there is an hw echo canceller,
this is used instead of the SW canceller
wancfg: hw echo cancel = no
zapata.conf: hw echo cancel = yes
chan_zap activates an echo canceller. As the hw echo canceller is
disabled the software EC is used
wancfg: hw echo cancel = yes/no
zapata.conf: hw echo cancel = no
chan_zap does not activates any echo canceller.
Is this correct?
2. During Fax transmissions the EC should be disabled. IIRC there is a
deubg message similar to "fax tone detected, disabling echo canceller
...". I made some tests with Fax and activated EC. In log messages I see
that the EC is activated as soon as the call is connected, but there is
no log message that a fax is detected and the EC is disabled.
How can I disable the EC during fax transmissions?
Thanks
Klaus
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