Message Session Relay Protocol Adaptation for Interactive Connectivity

Message Session Relay Protocol Adaptation for Interactive Connectivity Establishment (ICE) draft-niemi-simple-msrp-ice-00 Speaker：Wenping Zhang Date： 2008/01/23

Outline Introduction n Overview of Operation n Generating SDP offer n Generation SDP Answer n Reference n 2

Introduction n The Message Session Relay Protocol (MSRP) defines a mechanism for transmitting a series of related instant messages in the context of a session. n This session is established using a separate session negotiation protocol, such as the Session Initiation Protocol (SIP) , and the Offer/Answer Model with the Session Description Protocol (SDP). 3

Overview of Operation n To initiate an MSRP session, the initiator collects ICE candidates, each of which are one of three types: l l l An active candidate for which the agent will attempt to open a TCP connection A passive candidate for which the agent will be in passive mode and only listen for incoming connections Simultaneous open candidate, for which the agents will attempt a TCP simultaneous open 4

Generating SDP Offer v=0 o=jdoe 2890844526 2890842807 IN IP 4 s= c=IN IP 4 192. 0. 2. 3 t=0 0 a=ice-pwd: asd 88 fgpdd 777 uzj. Yhag. Zg a=ice-ufrag: 8 hh. Y m=message 7746 TCP/MSRP * a=accept-types: text/plain a=path: msrp: //192. 0. 2. 3: 7746/asd 88 fgpdd 777 uzj. Yhag. Zg; tcp a=candidate: 1 1 tcp-so 2130706178 10. 0. 0. 5 12534 typ local a=candidate: 2 1 tcp-pass 2130706178 10. 0. 0. 5 12534 typ local a=candidate: 3 1 tcp-so 1694498562 192. 0. 2. 3 7746 typ srflx raddr 10. 0. 0. 5 rport 12534 a=candidate: 4 1 tcp-act 1694498562 192. 0. 2. 3 7746 typ srflx raddr 10. 0. 0. 5 rport 12534 a=candidate: 5 1 tcp-pass 1694498562 192. 0. 2. 3 7746 typ srflx raddr 10. 0. 0. 5 rport 12534 a=candidate: 6 1 tcp-pass 1694498562 192. 0. 2. 3 7746 typ relay raddr 10. 0. 0. 5 rport 12534 5

Generating SDP Answer v=0 o=jdoe 2890844526 2890842807 IN IP 4 s= c=IN IP 4 192. 0. 2. 3 t=0 0 a=ice-pwd: asd 88 fgpdd 777 uzj. Yhag. Zg a=ice-ufrag: 8 hh. Y m=message 7746 TLS/MSRP a=setup: holdconn # Also useless. . . a=connection: existing a=fingerprint: SHA-1 4 A: AD: B 9: B 1: 3 F: 82: 18: 3 B: 54: 02: 12: DF: 3 E: 5 D: 49: 6 B: 19: E 5: 7 C: AB a=accept-types: text/plain a=path: msrp: //192. 0. 2. 3: 7746/asd 88 fgpdd 777 uzj. Yhag. Zg a=candidate: 1 1 tls-so 2130706178 10. 0. 0. 5 12534 typ local a=candidate: 2 1 tls-act 2130706178 10. 0. 0. 5 12534 typ local a=candidate: 3 1 tls-pass 2130706178 10. 0. 0. 5 12534 typ local a=candidate: 4 1 tls-so 1694498562 192. 0. 2. 3 7746 typ srflx raddr 10. 0. 0. 5 rport 12534 a=candidate: 5 1 tls-act 1694498562 192. 0. 2. 3 7746 typ srflx raddr 10. 0. 0. 5 rport 12534 a=candidate: 6 1 tls-pass 1694498562 192. 0. 2. 3 7746 typ srflx raddr 10. 0. 0. 5 rport 12534 6

Reference n Message Session Relay Protocol Adaptation for Interactive Connectivity Establishment (ICE) n RFC 4975 The Message Session Relay Protocol 7