[asterisk-users] Detecting a fax

Neil Youngman neil.youngman at wirefast.com
Fri Jan 11 03:23:01 CST 2019

On 11/01/2019 09:19, Administrator TOOTAI wrote:
> Le 11/01/2019 à 10:12, Neil Youngman a écrit :
>> A while back, I posted about detecting when a call was picked up by a 
>> fax machine. It was suggested that having a "fax" extension and 
>> "faxdetect=yes" would cause it to jump to the "fax" extension. This 
>> was not something I could get to work.
>> I have now created a very simple example. In sip.conf I have 
>> "faxdetect = yes". My example extension is:
>> [test]
>> ;
>> ; Voice test extension
>> ;
>> exten => voicetest,1,NoOp()
>>      same => n,LOG(Notice,${CHANNEL}: Extension voiceout starting)
>>      same => n,LOG(Notice,${CHANNEL}: Starting Answer Machine Detection)
>>      same => n,AMD()
>>      same => n,LOG(Notice,${CHANNEL}: Answer Machine Detection 
>>      same => n,Playback(/var/lib/asterisk/sounds/en/demo-congrats)
>>      same => n,LOG(Notice,${CHANNEL}: Voice out extension complete)
>>      same => n(hangup),Hangup()
>> ;
>> ; Fax detected extension
>> ;
>> exten => fax,1,NoOp()
>>      same => n,LOG(Notice,${CHANNEL}: Extension fax starting)
>>      same => n,LOG(Notice,${CHANNEL}: Fax Machine Detected)
>>      same => n,Playback(/var/lib/asterisk/sounds/en/silence/2)
>>      same => n,LOG(Notice,${CHANNEL}: Fax extension complete)
>>      same => n(hangup),Hangup()
>> and the logs show that calling a fax using the voiceout extension in 
>> context test does not result in the fax extension being triggered.
>> [Jan 11 08:55:10] NOTICE[18073][C-00000115] Ext. voicetest: 
>> SIP/ Extension voiceout starting
>> [Jan 11 08:55:10] NOTICE[18073][C-00000115] Ext. voicetest: 
>> SIP/ Starting Answer Machine Detection
>> [Jan 11 08:55:13] NOTICE[18073][C-00000115] Ext. voicetest: 
>> SIP/ Answer Machine Detection 
>> [Jan 11 08:55:44] NOTICE[18073][C-00000115] Ext. voicetest: 
>> SIP/ Voice out extension complete
>> Just for completeness this is how the call is originated, with a 
>> different phone number:
>> Action: Originate
>> ActionId: 1234567W001-125
>> Context: test
>> Exten: voicetest
>> Priority: 1
>> Channel: SIP/+441632660987 at
>> Timeout: 60000
>> Async: True
>> Can anyone offer any insight into why this isn't working?
>> Neil Youngman
> You didn't ANSWER() the call

It's an outgoing call. I wouldn't expect to answer an outgoing call?


Neil Youngman 
Wirefast Limited
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