Hi All,
I am developing a fax gateway application using the Sofia SIP.
Following is the sequence of SIP messages happening in that order between
Calling and Called Gateways
Both the gateways are running Sofia SIP
Calling Gateay Called Gateway
1) INVITE (audio 9000 RTP..) -----> 2) 200 OK (audio 9000 RTP...)
|
|
\/
4) 200 OK (image 0 UDPTL t38) <----- 3) INVITE (image 9000 UDPTL t38)
When the Called Gateway sends the second INVITE for fax data, the Calling
Gateway sends 200 OK, with image port set to 0. Then sending of fax data fails.
I do not know, why the 200 OK should send image with port set to 0 ? Could you
please provide your valuable insight and expert advice on this?
Additional Info- If the Calling Gateway is replaced by D-Link gateway, which
may not be using Sofia SIP, while the Called Gateway still uses Sofia SIP, the
second 200 OK is sent with image port set to 9000 correctly and fax
communication can proceed successfully.
With Best Regards,
Kaustubh Patwardhan
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