Nicolas Bougues
2004-Feb-20 12:27 UTC
[Asterisk-Users] Disabling echo cancellation on fax ?
Dear all, I'm trying to use a fax (via a SIP adapter) on an Asterisk box (going out on a Zap PRI channel). Unfortunatly, the transmission doesn't work well (if at all). Here is a "zap show channel 1" dump : Channel: 1> File Descriptor: 9 Span: 1 Extension: Context: ft_in Caller ID string: Destroy: 0 Signalling Type: PRI Signalling Owner: Zap/1-1 Real: Zap/1-1 Callwait: <None> Threeway: <None> Confno: -1 Propagated Conference: -1 Real in conference: 0 DSP: yes Relax DTMF: no Dialing/CallwaitCAS: 0/0 Default law: alaw Fax Handled: yes Pulse phone: no Echo Cancellation: 128 taps, currently ON PRI Flags: Call Actual Confinfo: Num/0, Mode/0x0000 Actual Confmute: No The SIP side is of course using A-Law as well. The "Fax Handled" line seems to mean that somewhat Asterisk detected the fax tone. But the Echo Cancellation remains ON. Shouldn't it be disabled in such a case ? If so, did I miss a parameter somewhere ? Note that I don't have anything special in my config files for this extension : it setup just like any other local SIP phone. -- Nicolas Bougues Axialys Interactive