Jerry, If you are using ethernet as your transport, the maximum ethernet frame size is 1518. The ethernet header is 18 bytes. So the maximum payload is 1500 bytes. The stack on your system does the correct thing and fragments your INVITE.
We have also seen issues with SIP servers not supporting fragmented UDP packets. This is sad since it means they are not using a good IP stack. You could use compact form headers to shrink you INVITE. The other alternative is to use TCP for transport, which is stream based. This was the solution we had to use for the proxy that didn't support IP fragments. Colin.. Jerry Richards wrote: > By the way, regarding my Email below, I set the following tag during > initialization: NTATAG_UDP_MTU(2000). This should be sufficient for the > INVITE (which is of size ~1508). > > Best Regards, > Jerry > > -----Original Message----- > From: Jerry Richards [mailto:jer...@tonecommander.com] > Sent: Friday, December 19, 2008 9:11 AM > To: 'sofia-sip-devel@lists.sourceforge.net' > Subject: Fragmented IP protocol (proto=UDP 0x11, off=0) > > Hello All, > > Does anyone know why I would see "Fragmented IP protocol (proto=UDP 0x11, > Off=0)" frames in my Wireshark/Ethereal trace file? The message is an > outbound INVITE from my sofia phone, and Wireshark notes that it reassembled > the IP packet in the following frame (which is an INVITE). I noticed also > in the following frame that Wireshark shows the Proxy-Authorization header > preceded by the phrase [truncated]. > > The length of the first fragmented IP packet data is 1480 bytes, and the > length of follow-on IP packet data is just 8 bytes. > > Does anyone know why this is happening? I think the SIP server I'm using is > confused by this because I'm not getting a reply to the INVITE. > > Best Regards, > Jerry > > > ------------------------------------------------------------------------------ > _______________________________________________ > Sofia-sip-devel mailing list > Sofia-sip-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sofia-sip-devel > ------------------------------------------------------------------------------ _______________________________________________ Sofia-sip-devel mailing list Sofia-sip-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sofia-sip-devel
