I'm a newbie of sip implementation. Here is a question about sip re-invite request that appearing at the end of a calls.
After Caller A and Callee B construct a dialog, B sends a re-invite request with sdp "sendony" (Cseq 1). B responses 200 OK with sdp "receonly" (Cseq 1). B sends a ACK with again with (Cseq 1). then A send a BYE with (Cseq 24) Is there any sections in any RFCs defines the behavior described here with sending reinvite at the end of a conversation with sendonly prior to terminating the call? Is it something related to fax? |Time | |7008.230 | INVITE SDP (g711A g711U g729 g721 telephone-ev...RTPType-101) |SIP From: <sip:[email protected] To:< sip:[email protected] | |(5060) ------------------> (5060) | |7008.230 | 100 Trying| |SIP Status | |(5060) <------------------ (5060) | |7010.485 | RTP (g711A) |RTP Num packets:15419 Duration:308.360s SSRC:0xD4795D1A | |(1024) <------------------ (17002) | |7010.517 | 183 Session Progress SDP (g711A telephone-even...PType-101) |SIP Status | |(5060) <------------------ (5060) | |7010.798 | RTP (g711A) |RTP Num packets:471 Duration:9.403s SSRC:0xCCB90808 | |(1024) ------------------> (17002) | |7020.206 | 200 OK SDP (g711A telephone-eventRTPType-101) |SIP Status | |(5060) <------------------ (5060) | |7020.225 | RTP (g711A) |RTP Num packets:18163 Duration:363.231s SSRC:0xCCB90808 | |(1024) ------------------> (17002) | |7020.237 | ACK | |SIP Request | |(5060) ------------------> (5060) | |7020.225 | RTP (g711A) |RTP Num packets:17786 Duration:355.689s SSRC:0xCCB90808 | |(1024) ------------------> (17002) | |7318.855 | RTP (telephone-event) DTMF Five 5 |RTP Num packets:2 Duration:0.020s SSRC:0xD4795D1A | |(1024) <------------------ (17002) | |7318.905 | RTP (g711A) |RTP Num packets:3230 Duration:64.579s SSRC:0xD4795D1A | |(1024) <------------------ (17002) | |7383.475 | INVITE SDP (g711A telephone-eventRTPType-101) |SIP Request | |(5060) <------------------ (5060) | |7383.476 | RTP (g711A) |RTP Num packets:4 Duration:0.060s SSRC:0xCCB90808 | |(1024) ------------------> (17002) | |7383.495 | 200 Ok SDP (g711A telephone-eventRTPType-101) |SIP Status | |(5060) ------------------> (5060) | |7383.505 | RTP (g711A) |RTP Num packets:34 Duration:0.660s SSRC:0xD4795D1A | |(1024) <------------------ (17002) | |7383.547 | ACK | |SIP Request | |(5060) <------------------ (5060) | |7384.152 | BYE | |SIP Request | |(5060) ------------------> (5060) | |7384.170 | 200 OK | |SIP Status | |(5060) <------------------ (5060) | _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
