SIP: Status and Directions
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1 SIP 1 SIP: Status and Directions Henning Schulzrinne Dept. of Computer Science Columbia University New York, New York schulzrinne@cs.columbia.edu Sylantro December 17, 1999
2 SIP 2 SIP overview/review SIP services SIP standardization status SIP bake-off SIP for notification SIP for mobility Overview
3 SIP 3 Architecture MG MGC Internet circuit-switched voice (POTS, ISDN) proxy GK GK proxy gateway PSTN RTP circuit-switched voice SIP H.323 Megaco/MGCP/MDCP
4 SIP 4 SIP SIP = signaling protocol for establishing sessions/calls/conferences/ session = audio, video, game, chat, called server may map name to user@host 4. callee accepts, rejects, forward (! new address) 5. if new address, go to step 2 6. if accept, caller confirms 7....conversation caller or callee sends BYE
5 SIP 5 SIP Operation in Proxy Mode cs.columbia.edu cs.tu-berlin.de cz@cs.tu-berlin.de 1 INVITE henning@columbia.edu 200 OK 7 2 henning? hgs@play location server 3 4 INVITE hgs@play 200 OK 6 5 play 8 ACK henning@columbia.edu tune 9 ACK hgs@play 10 media stream
6 SIP 6 SIP Operation in Redirect Mode ieee.org? location server tu-berlin.de 4 1 INVITE henning@ieee.org 302 Moved temporarily Contact: hgs@columbia.edu 2 henning columbia.edu ACK henning@ieee.org INVITE hgs@columbia.edu columbia.edu OK ACK hgs@columbia.edu hgs
7 SIP 7 SIP Advanced Features operation over UDP or TCP multicast invitations basic ACD interactive web response (IWR) UA $ proxy = proxy/redirect $ proxy/redirect stateless proxies: self-routing responses forking proxies: call several in sequence and/or parallel security: basic (password), digest (challenge/response), PGP
8 SIP 8 More SIP Internet Telephony Services camp-on without holding a line short message service ( instant messaging ) schedule call into the future call with expiration date add/remove parties to/from call mesh buddy lists
9 SIP 9 Internet Telephony as Part of Internet address = SIP address SIP URLs in web pages forward to , web page, chat session,... include web page in invitation response ( web IVR ) RTSP: choose your own music-on-hold include vcard, photo URL in invitation
10 SIP 10 SIP Extensibility headers that receiver may ignore, e.g., Photo new methods and inquire about those supported (OPTIONS) features that receivers needs to understand: Required! Unsupported e.g., Required: com.sylantro.feature proposed: features supported via Supported header
11 eligible for Draft Standard: 6 months, 2 implementations p SIP 11 SIP Standardization Status Feb. 2, 1999: IETF Proposed Standard March 17, 1999: IETF RFC 2543 new SIP working group (move from mmusic) working on updated draft based on implementation experience mostly clarifications + optional headers, no new version
12 SIP 12 SIP Work Items sip-cgi call processing language (CPL) reliable provisional (1xx) responses caller preferences third-party call control SIP for subscribe/notify SIP ISUP interworking SIP H.323 interworking billing reverse channel setup for call progress tones pre-ringing resource reservation
13 SIP 13 SIP Bake-Off 3 bake-offs: April, August, December from 15 to 33 groups hardware, PSTN gateways, proxy/redirect servers, clients, test instrument,...
14 SIP 14 SIP Bake-Off Participants 3Com dynamicsoft Mitel 8x8 Ellemtel Netspeak Agilent Ericsson Nortel Alcatel Facet Nuera Broadsoft Helsinki Univ. OZ.com British Telecom Hewlett-Packard Pingtel Catapult Indigo Radcom Cisco IPcell Telogy Columbia University Lucent Vovida Dialogic MCI Worldcom VTEL Mediatrix
15 SIP 15 SIP Bake-Off Goals basic call set-up registration, user location proxies and redirect server operation advanced features: security identify implementation bugs and robustness issues identify spec ambiguities
16 SIP 16 SIP Bake-Off Results almost all implementations could establish basic calls either on arrival or after minor on-site fixes tested redirection, proxying, security, registration,... generated interoperability test cases and tools will fold clarifications into Draft revision of RFC and web page at hgs/sip install public testing mechanisms (Pulver OpenTestNet,
17 SIP 17 Integrating Signaling and Instant Messaging: Some Ideas reverse signaling: callee indicates availability buddy lists = special case of event notification other events: sensor 17 smells smoke, Beanie Babies are on sale, (voice) mail has arrived,... subscribe notify set up call useful for call parking many SIP mechanisms apply: security, redirection, proxying, content negotiation,...
18 SIP 18 SIP for Event Notification add two methods: SUBSCRIBE and NOTIFY proxy server may intercept SUBSCRIBE use message body for event description default: presence, indicated by REGISTER one of many proposals for presence (IETF WG!)
19 SIP 19 subscriber Alice Bob SIP for Event Notification SUBSCRIBE NOTIFY SUBSCRIBE proxy SUBSCRIBE NOTIFY REGISTER publisher Carol
20 SIP 20 new network new IP address (DHCP) mobile IP hides addr. changes Mobility but: little deployment : encapsulation overhead : dog-legged routing CH data data home network CN FA HA tunnelled data MH MH CH HA HA mobile host correspondent host router with home agent functionality router with foreign agent functionality : IP address filtering MH data foreign network
21 SIP 21 SIP Mobility Overview pre-call mobility SIP proxy, redirect mid-call mobility SIP re-invite, RTP recovery from disconnection
22 SIP 22 MH acquires IP address via DHCP SIP Mobility: Pre-call optional: MH finds SIP server via multicast REGISTER MH updates home SIP server CH redir home network MH MH CH redir mobile host correspondent host SIP redirect server SIP INVITE SIP 302 moved temporarily SIP INVITE SIP OK optimization: hierarchical LR (later) MH foreign network 5 data
23 SIP 23 SIP mobility: mid-call redir home network MH MH CH redir mobile host correspondent host SIP redirect server MH!CH: new IN- VITE, with Contact and updated SDP CH SIP INVITE SIP OK data re-registers with home registrar MH MH foreign network
24 SIP 24 SIP mobility: multi-stage registration Don t want to bother home registrar with each move San Francisco From: alice@ny Contact: CA From: alice@ny Contact: alice@ca NY Los Angeles From: alice@ny Contact: REGISTER INVITE
25 SIP 25 SIP basic standard stable Conclusion multiple interoperating implementations backward-compatible features: interoperation with legacy signaling systems mobility caller preferences call transfer... programming of services: cgi, CPL, applets
26 SIP 26 For more information... SIP: RTP: hgs/rtp Papers:
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