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Path to Reality for Internet Telephony

Path to Reality for Internet Telephony. henry.sinnreich@mci.com. Disclaimer: These may or may not be the opinions…. Overview. Business case for IP telephony protocols IETF-ITU Progress: PINT/SIP QoS and Service Agreements Security Charging Lowest Cost ALL IP Networks

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Path to Reality for Internet Telephony

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  1. Path to Reality forInternet Telephony henry.sinnreich@mci.com Disclaimer: These may or may not be the opinions….

  2. Overview • Business case for IP telephony protocols • IETF-ITU Progress: PINT/SIP • QoS and Service Agreements • Security • Charging • Lowest Cost ALL IP Networks • Is H.323 setting back Internet Telephony? • Telephony Signaling and Device Control Henry Sinnreich

  3. Telephony Moves to IP Most telecom revenue Least of traffic How much cheaper? Internet Data is critical Most traffic is data Telephony is just another IP service IP Tel Protocols Have a Business Case There is no business case for another telephony network (VoIP) Telephony becomes another Internet feature Design protocols to support and to integrate it well Henry Sinnreich

  4. PINT CLIENT SERVER SCP/IN PSTN or PBX WWW/IP NETWORK PSTN-Internet (PINT) • C->S: INVITE marketing@pint.mailorder.com SIP/2.0 • Via: SIP/2.0/UDP 169.130.12.5 • From: anon-1827631872@chinet.com • To: 1-800-IRON-YES • Call-ID: 19971205T235405.56.78@chinet.com • Subject: Sale of Ironing Boards • Content-type: application/sdp • Content-length: … • v=0 • o=- 53655765 2353687637 IN IP4 128.3.4.5 • I=Ironing Board Promotion • c= TN RFCxxxx +1-201-406-4090 • m=audio 0 voice Request to Call Request to Fax Request to Hear Content Henry Sinnreich

  5. ITU-T Q.5/11, dated May ‘98 Management Relationship PUAF IN Service Control Bearer Connection Control Internet SIP network boundary SCGF C/BGF MGF PSTN SCF SDF SMAF SMF SSF SRF SCEF CCF SCGF Service Control Gateway Function SDF Service Data Function SMF Service Management Function SMAF Service Management Agent Function SRF Specialized Resource Function SSF Service Switching Function CCF Call Control Function C/BGF Call/Bearer control Gateway Function MGF Management Gateway Function PUAF PINT User Agent Function SCEF Service Creation Environment Function SCF Service Control Function PINT: ITU SG.11 Functional Architecture for IN/Internet Henry Sinnreich

  6. Policy Architecture Management Tool Repository Client Repository access protocol Policy Repository (Directory, DB, etc.) Repository access protocol Repository Client Policy Decision Point (PDP) Policy Enforcement Point (PEP) QoS Service Level Administration LDAP Management Tool Directory Policies PDP PEP PEP Access Network Other Network Edge Router Edge Router Backbone Admin. 1 Backbone Administration Admin. 2 • Access net: Integrated Services • Backbone: Differentiated Services • Service Policy Rules in directory • Policy Architecture: • Directory • Policy Decision Point (PDP) • Policy Enforcement Point (PEP) Policy protocol Henry Sinnreich

  7. Proxy Policy Server Proxy AAA Server ngIN possibly Home Server SIP Proxy Server Policy and Accounting for SIP AAA messages • Policy events: • INVITE • ACK • CANCEL • BYE AAA messages SIP msgs SIP messages SIP msgs SIP Proxy Server AAA Client SIP client SIP client Callee Caller Henry Sinnreich

  8. PSTN IP Virtual Private Network - Extranet • Authentication • Routing • QoS • Transactions • AAA: • Authentication • Authorization • Accounting • Roaming Operations Credit verification & payments Iptel Gwy Internet encrypted tunnels Security Gwy Security Gwy Intranet Intranet • Tunneling protocols: • IPSEC • L2TP, MPLS Henry Sinnreich

  9. Example: Integrated Messaging with RTSP and SIPE-mail for call centers Send personal information to customers 1. INVITE SIP SERVER MAIL CLIENT 5. e-mail URL A/V CLIENT 2. LOCATION 3. Setup RECORD & PLAY RTSP 4. VOICE MENU and RECORD a/v MSG Interactive voice response (IVR) 6. A/V MSG STREAM MEDIA SERVER MEDIA PLAYER RTSP Henry Sinnreich

  10. Heterogeneous, redundant and large overhead All IP IP Servers IP Servers Gate- keeper IN AIN Servers Web/IP Applications IS & NM/SNMP H.323 IPTel Mail Web POTS TDM IP Web/IP based Information Systems & NM IP/MPLS Information Systems & TMN/CMIP/OSI ATM Gigabit Ethernet SONET WDM/Fiber • Savings: • Software & Systems • Bandwidth • Duplicating equipment ITU Telecom Fiber ITU IMTC IETF Lowest Cost All IP Architecture Henry Sinnreich

  11. Is H.323 holding back Internet telephony ? • PC’s give IP telephony a bad image - tough PC problem • H.323 was not designed to be an Internet telephony standard - but H.3xx extension for IP, IPX LANs • Management Babylon: TMN/CMIP/OSI plus SNMP • Interoperability dead end: Shortcuts from ITU std’s • Waste of bandwidth: 20 byte voice + 40 byte overhead • Codecs can’t adapt to Internet - though RTCP is there • No fit with Internet security (RAS vs. AAA and firewalls) • Duplication with IN/AIN and Internet servers • 3rd network routing & tables: Gatekeeper zones • WWW unaware - no fit for XML, VoXML - what future ? Henry Sinnreich

  12. AIN/IN NCP SS7 TCAP SS7 ISUP ? SIGNALING GATEWAY ? inter GWY ? PSTN GATEWAY CONTROL ? INTERNET RTP IMT MEDIA GATEWAY Interoperable IP Telephony Gateways GWY Protocols ? • ISO/IEC DSM-CC User-Network Protocol • NOTASIP Nothing Other Than A Simple Internet Phone • SGCP Simple Gateway Control Protocol • RSGP Reliable Signaling Gateway Ctrl. Prot. • DIAMETER series Twice RADIUS • IPDC series Six IP Device Control Protocols • Etheric • DTR/TIPHON 020004 • SIP with PIP extensions VOICE, FAX, DATA Henry Sinnreich

  13. GWY GWY GWY GWY GWY RTP MUX Gateway Signaling Schema SS7 ANSI TCAP/SS7 SS7 ETSI IN ctrl SS7 AIN SIP/IP Signaling ISUP/SS7 Sig. GWY ctrl PSTN IMT Media GWY ISDN T1 Signaling RTP Internet Henry Sinnreich

  14. IP Telephony DevicesSignaling and Control • PSTN-IP gateways • Interactive voice response units • Automatic call distributors • Voice recognition & understanding • Conferencing bridges • Pay phones - web kiosks • …. Other IETF: How many and what protocols ? Henry Sinnreich

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