[asterisk-users] Dialplan for receiving faxes on Asterisk

Simon Humbert simhumb at gmail.com
Thu Jan 29 23:25:08 CST 2015

  Hi all,

It looks like people commonly use this kind of dialplan when receiving
faxes on Asterisk, with a jump to extension fax during the Wait() if a fax
tone is detected:

exten => _X.,1,Answer()
exten => _X.,n,Wait(n)
exten => _X.,n,...do stuff...
exten => _X.,n,Hangup()

exten => fax,1,Goto(fax-rx,receive,1)

exten => receive,1,...
exten => receive,n,...do stuff...
exten => receive,n,ReceiveFAX()

This is well suited in case Asterisk needs to receive both voice and fax
calls. But what if Asterisk is only used to receive fax calls, can we start
directly at the fax-rx context? I've heard that it's better to wait a few
seconds before calling ReceiveFAX(), is it still necessary in case we don't
actually need fax detection?

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