I am trying to send a T.38 fax from sipp to Zoiper. The negotiations happen fine and sipp does play the pcap, but it's sending T.38 packets to incorrect port. One interesting thing I could find was if Zoiper negotiated its media port as 8000(which is by default), then sipp used Local media port as *11324 * and and Remote Port as *19324*(ie 11324+8000). sipp wasn't honoring the port it sent in the negotiating INVITE for T.38. It always used 11324 as the Local Port. However, if Zoiper side negotiated with Port 9000(instead of default 8000), the sipp again used local port *11324* (for some reason i can't understand) and remote port *20324*(ie 11324+9000). So SIPP seems to be sending T.38 packets to Port 11324+(whatever Port the remote end negotiates with).
I don't see that problem in normal G711 audio. Please help.* PS: *I have already gone through the http://www.opensource-archive.org/showthread.php?t=42823 link for making necessary changes to sipp to support sending t38 fax. Regards, Harneet -- Doubts are better off clarified, than their explanations assumed.
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