On Mon, 2008-11-24 at 12:07 -0500, M. Ranganathan wrote: > Attached is the call flow for a caller initiated Blind Transfer. The > ITSP is bt.com. > > I am wondering about why the ITSP would return 503. The re-INVITE > looks ok to me and the codecs offered are a subset of the previous > answer from the ITSP ( but maybe I have been staring too long). A > second pair of eyes may spot something.
According to 3261, the 503 response means some sort of overload or failure at the server, and doesn't depend on the request in question. So if BT is using 503 correctly (which I would not assume), it's not *your* problem. I would test it again and then contact BT tech support to find out what is wrong with the server. However, I do see one difference between the initial SDP and the revised SDP: a=rtpmap:0 PCMU/8000 vs.: a=rtpmap:0 pcmu/8000/1 The case of the letters is different (which shouldn't matter if SDP is case-insensitive) and the second one has "/1" (which I think is the default, so it shouldn't matter, but it might). Dale _______________________________________________ sipx-dev mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-dev Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-dev
