Hello.
I've just done some tests and I can send faxes using alaw and my SIP
provider.
I've another provider supporting T38, but something goes wrong and I
can't make my fax (connected via T38 enabled ATA) to send faxes.
The problem is this: I'd like to use g729 for outgoing voice calls, so
I've decided to perform a FaxDetect as soon as an internal phone tries
to call using that provider. If it's a fax, it should be switching to
alaw and dial out.
Here's the extension.conf:
exten => _XXXX.,1,SetVar(CALLEDNUMBER=${EXTEN})
exten => _XXXX.,n,FaxDetect()
exten => _XXXX.,n,Dial(SIP/${ext...@myprovider,90)
exten => _XXXX.,n,Hangup
exten => fax,1,Ringing
exten => fax,n,Wait,1
exten => fax,n,SetGlobalVar(SIP_CODEC=alaw)
exten => fax,n,Wait,1
exten => fax,n,Dial(SIP/${callednumb...@myprovider,90)
exten => fax,n,Hangup
No need to say: it doesn't work.
Here's what I get in my console:
-- Executing [12...@default:1] SetVar("SIP/002-e4e1",
"CALLEDNUMBER=12345")
-- Executing [12...@default:2] FaxDetect("SIP/002-e4e1", "")
Jul 14 13:19:35 NOTICE[4119649168]: app_faxdetect.c:301 detectfax_exec:
Redirecting SIP/002-e4e1 to fax extension [DTMF]
-- Executing [...@default:1] Ringing("SIP/002-e4e1", "")
-- Executing [...@default:2] SetGlobalVar("SIP/002-e4e1",
"SIP_CODEC=alaw")
== Setting global variable 'SIP_CODEC' to 'alaw'
-- Executing [...@default:3] Wait("SIP/002-e4e1", "1")
Jul 14 13:19:35 NOTICE[4119649168]: channel.c:1810 cw_read: Dropping
incompatible voice frame on SIP/002-e4e1 of format slin since our native
format has changed to g729
-- Executing [...@default:4] Dial("SIP/002-e4e1",
"SIP/12...@myprovider,90")
-- Called 12...@myprovider
-- SIP/myprovider-cc61 is making progress passing it to SIP/002-e4e1
server*CLI> sip show channels
Peer User/ANR Call ID Seq (Tx/Rx) Form Hold
Last Message
194.120.0.198 12345 35c6f5d0117 00103/00000 g729 No Tx:
INVITE
xx.xx.xx.xx 002 80ac2d18-57 00101/00002 g729 No
Rx: ACK
2 active SIP channels
Same if I use SetVar and not SetGlobalVar.
Anybody has any idea on how to manage it?
Thank you!
Stefano
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