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SIP: VoIP Technologies

SIP: VoIP Technologies. Kenta Ito (620099). Voice-over-IP. Objective To communicate two or more users By voice over a packet-switched network Well Known Protocols H.323 MGCP SIP. Comparison of Protocols. Internet Multimedia Architecture. Session Initiation Protocol. Locating endpoints

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SIP: VoIP Technologies

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  1. SIP:VoIP Technologies Kenta Ito (620099)

  2. Voice-over-IP • Objective • To communicate two or more users • By voice over a packet-switched network • Well Known Protocols • H.323 • MGCP • SIP

  3. Comparison of Protocols

  4. Internet Multimedia Architecture

  5. Session Initiation Protocol • Locating endpoints • Establish a session • Exchange of media format information • Manage a media session • Establishing • Modifying the format • Terminating • Transporting instant messages

  6. SIP Methods

  7. Session Description Protocol SDP is to describe: • The type of media • The transport protocol • The format of the media • Multicast address for media • Transport Port for media • Remote address for media • Transport port for contact address

  8. SDP - Specification • Text-based using UTF-8 • Case-significant • Described as <type>=<value> • Three classes of information: • Session Description • Time Description • Media Description

  9. Description of SDP

  10. First Offer v=0 o=alice 2890844526 2890844526 IN IP4 host.atlanta.example.com s= c=IN IP4 host.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 8 97 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:97 iLBC/8000 m=video 51372 RTP/AVP 31 32 a=rtpmap:31 H261/90000 a=rtpmap:32 MPV/90000

  11. First Offer v=0 o=alice 2890844526 2890844526 IN IP4 host.atlanta.example.com s= c=IN IP4 host.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 8 97 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:97 iLBC/8000 m=video 51372 RTP/AVP 31 32 a=rtpmap:31 H261/90000 a=rtpmap:32 MPV/90000

  12. Answer v=0 o=bob 2808844564 2808844564 IN IP4 host.biloxi.example.com s= c=IN IP4 host.biloxi.example.com t=0 0 m=audio 49172 RTP/AVP 0 8 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 m=video 0 RTP/AVP 31 a=rtpmap:31 H261/90000

  13. Answer v=0 o=bob 2808844564 2808844564 IN IP4 host.biloxi.example.com s= c=IN IP4 host.biloxi.example.com t=0 0 m=audio 49172 RTP/AVP 0 8 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 m=video 0 RTP/AVP 31 a=rtpmap:31 H261/90000

  14. Second Offer v=0 o=alice 2890844526 2890844527 IN IP4 host.atlanta.example.com s= c=IN IP4 host.atlanta.example.com t=0 0 m=audio 51372 RTP/AVP 0 a=rtpmap:0 PCMU/8000 m=video 0 RTP/AVP 31 a=rtpmap:31 H261/90000

  15. Second Answer v=0 o=bob 2808844564 2808844565 IN IP4 host.biloxi.example.com s= c=IN IP4 host.biloxi.example.com t=0 0 m=audio 49172 RTP/AVP 0 a=rtpmap:0 PCMU/8000 m=video 0 RTP/AVP 31 a=rtpmap:31 H261/90000

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