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1 NSLAB NTT 2003

2 1. SIP NAT/FW 4. QoS (PPS ) 5. Q&A NSLAB NTT

3 SIP NSLAB NTT 2003

4 SIP IETF SIMPLE: SIP for Instant Messaging and Presence IMPP: Instant Messaging and Presence Protocol XMPP: Extensible Messaging and Presence Leveraging Extensions / Protocol SIP Jabber / 2002/11 XML IM 2002/11 WG IEPREP: Internet Emergency Preparedness XCON: Centralized Conferencing SIP: Session Initiation SIPPING: Session ENUM: Telephone IPTEL: IP Telephony Protocol Initiation Proposal Number Mapping E.164IP SIP Investigation (CPL) GW 1999/11 WG SIP (TRIP) 2001/8 WG 2003/11 MMUSIC: Multiparty AVT: Audio/Video MIDCOM: Middlebox NSIS: Next Steps in Multimedia Session Transport Communication Signaling NAT/FW QoS, Control NAT/FW middlebox RSVP (RTP) (SDP/SDPng) 2001/12 WG (RTSP) NSLAB NTT

5 SIP SIP SIP RFC2543bis04 RFC2543bis04 RFC3261 RFC3261 SIP SIP 99.2 RFC2543 Presence, IM RFC2848 (PINT) 10 RFC2976(INFO) 710 bis04 bis05 3 bis09 6 RFC RFC3264, 3266 (SDPoffer/answer, SDP IPv6 SIPS URL TLS S/C S/MIME RFC3204 RFC3262 RFC3372,3398 (ISUP,QSIG (1xx (SIP-T) (SIP-ISUP ) ) ) 11 (Pxxx) RFC3324,3325 (ID ID) 6 RFC3265 ( ) () Presence Conference State Dialog State NSLAB NTT

6 SIP TLS SIPS URI TLS Message body PGP S/MIME 2. TCP 3. DNS SRV/NAPTR SRV( ) SRV,NAPTR( ) NSLAB NTT

7 SIP offer-answer SDP draft RFC Max-Forwards 4. Strict routingloose routing 5. via branch 6. tag NSLAB NTT

8 SIP (:INVITE) (:BYE) Record-Route,Route Record-Route INVITE P1 BYE P2 User A Record-Route(=RR) INVITE UserB P1 INVITE UserB RR: P1 P2 User B INVITE UserB RR: P2 RR: P1 User A BYE UserB Route: P1,P2 BYE UserB Route: P2 BYE UserB User B Record-Route: Proxyinitial UA Route Route: UAsubsequent Proxy NSLAB NTT

9 SIP Loose (Request-URI) Proxy Request-URI Route Strict INVITE P1 Route:P2,UserB P1 INVITE P2 Route:UserB P2 INVITE UserB User A Loose INVITE UserB Route: P1:lr,P2:lr INVITE UserB Route:P2:lr P1 P2 INVITE UserB User B(0120) User A User B(0120) NSLAB NTT

10 SIP Asserted ID (RFC3325) ID ID ID ID / (P-Asserted-Identity) INVITE SIP proxy #1 INVITE* (ID ) Trusted domain SIP proxy #2 INVITE (ID ) INVITE (ID ) Untrusted domain SIP proxy #3 INVITE (ID ) untrusted domain ID Privacy IDP-Preferred-Identity INVITE* INVITE sip: @proxy.pstn.net SIP/2.0 Via: SIP/2.0/TCP useragent.cisco.com;branch=z9hg4bk-124 Via: SIP/2.0/TCP proxy.cisco.com;branch=z9hg4bk-abc To: <sip: @cisco.com> From: "Anonymous" <sip:anonymous@anonymous.invalid>;tag= P-Asserted-Identity: "Cullen Jennings" <sip:fluffy@cisco.com> P-Asserted-Identity: tel: Privacy: id NSLAB NTT

11 2. NSLAB NTT 2003

12 IM+ IM(instant messaging) X Y Z (Watcher A) X Watcher X B (Watcher B) Z (Presentity Z) Y (Presentity Y) B X (Presentity X) NSLAB NTT

13 IMPP WG Instant Instant MessagingPresence (SIMPLE, APEX, APEX, PRIM )) RFC3339 PIDF(draft) MSGFMT(draft)...WGLC SIMPLE XMPP SIMPLE CPIM APEX APEX APEX CPIM CPIM (draft) RFC2778 RFC2779 CPIM XMPP CPIM PRIM CPIM PRIM PRIM NSLAB NTT

14 SIP (RFC3265 ) SIP Event Notification Subscriber SUBSCRIBE/200 OK Event template package Notifier watcher information (=presence agent ) NOTIFY/200 OK Event package user presence NOTIFY/200 OK SUBSCRIBE/200 OK NOTIFY/200 OK NSLAB NTT

15 SIMPLE WG PUBLISH Event( ) Watcher- Server Watcher [ ] (Watcher A) X (Presentity X) [ ] CPIM(Common Profile for (PUBLISH) Instant Messaging) Watcher B (Watcher B) NSLAB NTT

16 SIP IM (Instant Messaging)2 (pager session ) Pager session pager session SIP MESSAGE SIPINVITE,BYE media stream SIP SIP Proxy SIP Proxy MESSAGE body: text or MSGFMT MESSAGE INVITE INVITE message(ex. text) RFC3428 MESSAGE pager NSLAB NTT

17 XMPP XML TCP XML ( ) XMPP server XMPP XMPP server Gateway XMPP SIP/ SIMPLE XMPP XMPP A B <?xml version='1.0'?> <stream:stream to='example.com' xmlns='jabber:client' xmlns:stream=' version='1.0'> <message from='juliet@example.com' to='romeo@example.net' xml:lang='en'> <body>art thou not Romeo, and a Montague?</body> </message> B A <?xml version='1.0'?> <stream:stream from='example.com' id='id_ ' xmlns='jabber:client' xmlns:stream=' version='1.0'>... authentication... <message from='romeo@example.net' to='juliet@example.com' xml:lang='en'> <body>neither, fair saint, if either thee dislike.</body> </message> </stream:stream> </stream:stream> NSLAB NTT

18 XCON: Centralized Conferencing BoF WG SIP A mechanism for membership and authorization control A mechanism to manipulate and describe media "layout" or "topology" for multiple media types (audio, video, text) A mechanism for notification of conference related events/changes (for example a roster) A basic floor control protocol Peer-to-peer cascading of conferences (one conference is a participant in another and vice versa) Loosely Coupled Conference: A loosely coupled conference is a conference without coordinated signaling relationships amongst participants. Loosely coupled conferences frequently use multicast for distribution of conference memberships. Tightly Coupled Conference: A tightly coupled conference is a conference in which a single user agent, referred to as a focus, maintains a dialog with each participant. The focus plays the role of the centralized manager of the conference, and is addressed by a conference URI. NSLAB NTT

19 3. NAT/FW NSLAB NTT 2003

20 TCP/IPUDP/IP TCP/IP UDP/IP IP IP ( ) ( ) IP 20 IP 20 TCP 20 P 8 IP TCP UDP NSLAB NTT

21 NSLAB NTT httpd2 TCP httpd3 httpd1 TCP Web (2001) (2002) TCP Web (2002) IP TC TCP 6 IP IP TCP 6 IP IP TCP 6 IP IP IP IP

22 NSLAB NTT

23 NSLAB NTT [ ] [ ]

24 SIPNAT NSLAB NTT

25 STUN (RFC3489) NAT NAT NAT NSLAB NTT

26 NSLAB NTT STUN NAT

27 NSLAB NTT STUN NAT

28 Binding STUN STUN STUN (= ) STUN (= ) STUN Shared Secret Request a -> S A <- S Shared Secret Response STUN USER NAME: PASSWORD: Binding Request a -> S Binding Request A -> S NAT a <- S Binding Response A <- S Binding Response STUN MAPPED-ADDRESS: Request NAT NAT SOURCE-ADDRESS: Response STUN CHANGED-ADDRESS: STUN NAT REFLECTED-FROM: Request (Request Request a -> S ) A <- S Binding Response CHANGE-REQUEST: RESPONSE-ADDRESS: STUN NSLAB NTT

29 5. QoS Priority Promotion Scheme NSLAB NTT 2003

30 IMM P2P QoS NSLAB NTT

31 NSLAB NTT / TCP TCP

32 NSLAB NTT 2003 QoS QoS

33 Priority Promotion Schemeが前提とするキュー方式 NTT秘(財産的情報) ﾈｯﾄﾜｰｸｻｰﾋﾞｽｼｽﾃﾑ研究所下記のようなキュー方式を MFクラス(Measurable 下記のようなキュー方式を MFクラス(MeasurableForwarding; Forwarding;観測可能な転送クラス)と定義観測可能な転送クラス)と定義 MFクラスでは試験パケットによりリンクの残帯域が推定可能 MFクラスでは試験パケットによりリンクの残帯域が推定可能基本動作は既存の優先制御(=Diffserv)で容易に実現可能基本動作は既存の優先制御(=Diffserv)で容易に実現可能通常のキュー方式 flow #1 flow #2 flow #1 flow #2 残帯域が測定可能なキュー方式 flow #1 flow #2 flow #2 品質劣化の原因リンク容量を上回るパケットが流入すると区別なく廃棄が発生するフロー１のパケットの品質は保証されないリンク容量を上回るパケットを流入してもフロー１のパケット優先クラスは必ず転送される非優先クラスで試して通過すれば優先クラスでも転送されるはず試験パケットにより残帯域が測定可能 NSLAB NTT

34 NSLAB NTT 2003 BWmf H+M M M H BWmf H+M M M H M H M H M M H M H M H M H M H M H M H M H M H H H H H M BWmf

35 MF-H MF-M MF MF class(measurable forwarding class) MF-HMF-M (HM) HM H M M H M H???? M H M NSLAB NTT

36 NSLAB NTT QoS Priority Promotion Scheme: PPS NW NW SIP RTP( ) RTP( ) RTCP( ) M M M H H M M H H M H M H HM M H M DiffServ loss M loss ( ) Middle High Low ToS RTCP NW RTP RTP IP IP

37 IntServ over DiffServ IntServ / RSVP IntServ DiffServ IntServ DiffServ IntServ QoS QoS * vol.85 No.9 pp NSLAB NTT

38 QoS QOS QOS Mbps Mbps QOS QOS NW SIP proxy SIP proxy! RSVP SIP proxy Q SIP proxy!:!!!!! NSLAB NTT

39 QoS 2003/3 2003/7 Diffserv WG EF, AF, BE 2003/ /2 2004/8 2004/11 IETF MIDCOM WG (Middlebox communications) => SNMPv3 NAT APL NAT SNMP NSIS WG (Next Steps in Signaling) (RSVP ) QoS (NTLP) (NSLP) ITU-T 2003/7 2003/92003/ /1 2004/2 JRG JRG SG13( ) Q.16Y.qosar ( ) Q / /4 2003/9 2003? 2004? SG11( ) Q.1,6Q.ncap1, 2 (GCP) Q.11Q.ncap3 GCP megaco profile Q.7,8,9TRQ.IPQoS.Sig.CS1 IP-QoS ETSI NW Megaco Packet Cable3GPPCOPS NSLAB NTT

図解でわかるVoIPのすべて - IP電話の技術から構築まで -

図解でわかるVoIPのすべて - IP電話の技術から構築まで - VoIP VoIP 2003 2003 9 10 1 IP VoIP VoIP 11301J101 VoIP(Voice over Internet Protocol) VoIP IP IP IP 3 1. IP 2. VoIP 3. QoS 4. IP 4 IP IP 5 1.1 IP IP IP IP VoIP VoIP 6 1.2 IP - - - - - 7 1.2 IP - - - - 8