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Our application is running into issues when we try and
create an INVITE with a large sdp that will go over 1500 total bytes. Our app
prefers UDP, but also has TCP added as transports. Our SIP domain has SRV
records which list udp before tcp for the sip domain. We have several questions relating to MTU / large packet
handling. Is the resip stack supposed to handle fragmentation? Does the resip stack check the interfaces MTU before it
sends a packet out? On Windows if we force a large INVITE it gets IP
fragmented. Should resip be setting the Don’t Fragment bit in the
IP header to enable Path MTU discovery for UDP? If a transaction is too large for the primary transport will
resip handle fallback to a second transport like TCP if SRV records are there? Or is all of this the applications responsibility? -Aron. SightSpeed Inc. http://www.sightspeed.com |