[asterisk-users] Detecting a fax

[Neil Youngman]

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 
${AMDSTATUS}/${AMDCAUSE})
     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/31.13.156.183:5060-000000f4: Extension voiceout starting
[Jan 11 08:55:10] NOTICE[18073][C-00000115] Ext. voicetest: 
SIP/31.13.156.183:5060-000000f4: Starting Answer Machine Detection
[Jan 11 08:55:13] NOTICE[18073][C-00000115] Ext. voicetest: 
SIP/31.13.156.183:5060-000000f4: Answer Machine Detection 
MACHINE/LONGGREETING-1500-1500
[Jan 11 08:55:44] NOTICE[18073][C-00000115] Ext. voicetest: 
SIP/31.13.156.183:5060-000000f4: 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 31.13.156.183:5060
Timeout: 60000
Async: True

Can anyone offer any insight into why this isn't working?

Neil Youngman



Neil Youngman 
Developer
Wirefast Limited
 
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