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Emerging VoIP Interoperable Universal Services

Emerging VoIP Interoperable Universal Services. Tankut Turhan Cisco Systems tturhan@cisco.com. Topics. Last couple years Old vs New world Convergence Vendor Issues Service Provider Issues. Source: ITXC. Telephony evolution. 20th Century 1995 Nerd to nerd 1997 Nerd to Grandma

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Emerging VoIP Interoperable Universal Services

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  1. Emerging VoIP Interoperable Universal Services Tankut Turhan Cisco Systems tturhan@cisco.com

  2. Topics • Last couple years • Old vs New world • Convergence • Vendor Issues • Service Provider Issues

  3. Source: ITXC Telephony evolution • 20th Century • 1995 Nerd to nerd • 1997 Nerd to Grandma • 1998/99 Grandma to Grandma • 21st Century • Anyone to Anyone • Any device to any device

  4. Any one to any one Any device to any device Not telephony only any more But “all media” communication IP is every where New World Telephony

  5. User Expectations Increasing • Performance • Always “on” • Ease of use • Multi-media Convergence • Mobility

  6. Networks of the 20th century • Do not scale • Networks must converge • Convergence requires • Standards • Interoperability • Better • Interoperable Standards

  7. First it was Hardware Interoperability It took about 50 years to solve Now we are dealing with Software Interoperability With Internet speed Interoperability is moving up the stack

  8. LDAP Service Application Radius TCAP INAP H.323 RAS H.323 ISUP Call Control & Signaling SIP ISDN CAS ISUP over IP MGCP Bearer Services TDM ATM IP PSTN Packet Circuit vs. Packet(“Mixing Oil & Water”)

  9. LDAP Service Application Radius TCAP INAP H.323 RAS H.323 ISUP Call Control & Signaling SIP ISDN CAS ISUP over IP MGCP Bearer Services TDM ATM IP PSTN Packet PSTN-centric Convergence View

  10. LDAP Service Application Radius TCAP INAP H.323 RAS H.323 ISUP Call Control & Signaling SIP ISDN CAS ISUP over IP MGCP Bearer Services TDM ATM IP PSTN Packet Internet-centric Convergence View

  11. Protocol z SCP Protocol x SS7 GW SG MGC STP STP SCTP SIGRAN MGCP IP Network 5E/4E Switch 5E/4E Switch 5E Switch MGCP MEGACO ITU H.248 Protocol y RTP transport MG NAS Q.931 R2 ... Signalling Integration aspects

  12. Open Service Application Layer Service Logic Services Plane IN Voice Service Logic Open/Standard Interface Open Call Control Layer Platform Embedded Call Control Plane Signaling and Call Control Service Access Function Switch-Based Service Logic End to End Voice Services Call Logic Open/Standard Interface Standards-Based Packet Infrastructure Layer Connection (Bearer) Plane Embedded Software Connection Negotiation Bearer Switching Switching Logic Platform decomposition

  13. SPNeeds Innovative Services Innovative Services Open Telephony Architecture

  14. H.323 Learnings • Several years of history • Rather slow evolution due to complexity • Interpretations may still vary • Most implementations does not interoperate off the shelf • However, still • reliable full-function protocol

  15. Separating infrastructure and application zones Improves scalability More room for service innovation But, new issues with interoperability • Sevice Applications • Internet Call Waiting • Click to Dial • Others to Come Services Plane Application Server GK Call Control Plane • Gatekeeper • Registration • Translation / Routing • Multi-Zone Support • . Other-Party Gatekeeper V Connection Plane • MultiService Gateway • Voice, Data, Fax • T1/E1 and more • NEBS H.323 OPT Scaling Strategy

  16. Infrastructure Zone Application Zone Services Plane Services Plane • Internet Call Waiting • Click to Talk • Virtual Second Line • Unified Messaging • IP-PBX • IP-ACD • IP-Conference • Prepaid • Wholesale • VPN • Overlap Dialing Plan • Network Security • Network QOS • Accounting V V Call Control Plane Call Control Plane H.323 Gatekeeper (Infrastructure) H.323 Gatekeeper (Service Application) Connection Plane H.323 Gateways • Resources: • DSP, MCU • Database Soft-Phone IP-Phone Gateways Buildind a Service Innovation Platform

  17. User Zone App Server GK Packet Network Infrastructure Zone GK Service Node Zone App Server GK PSTN Packet Network Packet Network (e.g. MCU) Database Zone App Server GK Packet Network Different Service ZonesDifferent Issues

  18. Multi-service Zones: DS0 and analog PRI/E1/T1 T3/E3/SS7-ISUP future VPN, Prepaid, Wholesale User Zones: Virtual Second Line Internet Call Waiting Click to Dial IP-Centrex, IP-PBX IP-ACD Service Node Zones: Multimedia Conferencing Unified Messaging Database Zones: Number Translation / Routing Directory Services Different Service ZonesDifferent Issues

  19. Billing and Settlement • Traditional telephony settlement • Bilateral agreements, Static inter-carrier routing, Batch CDR processing • Can not meet the demands of the new World • Clearinghouse model is more appropriate for the dynamic new world

  20. Billing and Settlement • Clearinghouse model • OSP, H.225 Annex G, iNow • Provide contemporary facilities for new world carriers. OSP offering more features for SP • aHIT! document on “Interoperability Requirements for Billing and Settlement” is a most needed first step forward

  21. Vendor needs: Less need for interpretation Well defined platform planes Well defined and straight forward protocols between planes Partnerships to create end to end solution Products not specific to a single region SP needs: Service Innovation Interoperable products to create innovative services Span different geographical regions Sophisticated application suites for services Open protocols and application interoperability is important Interoperability Requirements

  22. Developing Interoperable Standards • IETF model of consensus and working code is the way to cope with the Internet speed • Compare development cycles of • H.323 vs MGCP, SIP • and the levels of interoperability achieved • aHIT! Plays an important role for creation of the “New World Universal Service”

  23. “Telephones should interwork Universal services”Theodore Vail 1908 Thank You

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