Hello All -
I am attempting to use OPBX to terminate faxes out to the PSTN through a
session border contorller.
My call flow is OPBX -> SBC -> TDM Gateway -> End User Fax Terminal
My call file is generated using the WiKi example:
Channel: SIP/[EMAIL PROTECTED]
MaxRetries: 0
WaitTime: 400
Set: LOCALSTATIONID=inxs2
Set: LOCALHEADERINFO=OpenPBX Fax with T38
; Set: T38CALL=1
; Fax detection and switchover should be done by the receving party. Setting
; the following variable will enable openpbx to send the invite for the
initial switchover if
; a fax CNG is detected.
; Set: T38TXDETECT=something
Context: faxout
Extension: s
priority: 1
My faxout context looks like:
[faxout]
exten => s,1,Set(LOCALSTATIONID= FAX)
exten => s,n,Set(LOCALHEADERINFO=Foo Bar is a solution provider for
business)
exten => s,n,Set(FAXFILE=/tmp/1169761579.0.tif)
exten => s,n,TxFAX(${FAXFILE}|ecm|debug|caller)
exten => h,1,NoOp(TX: REMOTESTATIONID is ${REMOTESTATIONID})
exten => h,n,NoOp(TX: PHASEESTATUS is ${PHASEESTATUS})
Now when I send the .call file over to the outgoing directory, the call
comes up, the far end fax machine answers - but the call fax is sent over
G711 and the T38 negotiation doesn't occur.
Here's the SIP flow:
OPBX | SBC |
| INVITE SDP ( g711U) |SIP From: sip:[EMAIL PROTECTED]
To:sip:[EMAIL PROTECTED]
|(5060) ------------------> (5060) |
| 100 Trying| |SIP Status
|(5060) <------------------ (5060) |
| 180 Ringing SDP ( g711U) |SIP Status
|(5060) <------------------ (5060) |
| 200 OK SDP ( g711U) |SIP Status
|(5060) <------------------ (5060) |
| ACK | |SIP Request
|(5060) ------------------> (5060) |
On to my question ----
Should OPBX's ability to send T38 be send in the SDP of the first invite it
sends? That way the far end gateway and reply back with the RE-INVITE and
the T38 session will come up.
I've been reading the T38 RFC - But am not 100% clear...
Can anyone reply with the SDP piece of a successful T38 invite?
Here is mine:
CSeq: 102 INVITE
User-Agent: OpenPBX
Max-Forwards: 70
Date: Fri, 02 Feb 2007 22:05:14 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Content-Type: application/sdp
Content-Length: 158
o=root 14574 14574 IN IP4 XX.XX.XX.XX
s=session
c=IN IP4 XX.XX.XX.XX
t=0 0
m=audio 13320 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=silenceSupp:off - - - -
--
------
Christopher T Aloi
------
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