1. Peering Architecture IETF-63 VoIP Peering BOF Sohel Khan, Sprint, TR&D August 4, 2005 Copyright © Sprint 2005. All rights reserved.

2. Sohel Khan, Sprint--TR&D. Copyright © Sprint 2005. 2 Peering Requirement Security and Policy Integrity Efficiency Reliability Scalability Harmonious Interoperability Regulatory Accounting

3. Sohel Khan, Sprint--TR&D. Copyright © Sprint 2005. 3 The major Issue State and Cost –Where the state be deployed? –What kinds of state should the network have? –What are the impacts of state? –What is the cost of media forwarding circuitry? –What is the cost of signaling infrastructure? –Security features –SIP optimization –Transcoding –Regulatory implementation We believe that above depends on the way you deploy peering elements (PEs)

4. Sohel Khan, Sprint--TR&D. Copyright © Sprint 2005. 4 Conceptual Deployment Scenarios We illustrate four scenarios –Composed –Semi-Composed –Centralized (Non-IMS, IMS NNI, IMS UNI) –Distributed Our objective is to generate discussion in IETF community draft-sohel-sipping-s-bc-concept-arch-00.txt PTSC-SAC-2005-213, ATIS-PTSC, June, 2005

5. Sohel Khan, Sprint--TR&D. Copyright © Sprint 2005. 5 IP Phone Provider B Provider A PSTN MG SS7 Wireless Reference Diagram SF: Signaling Function MF: Media Function RF: Routing Function OF: O&M Function SF MF RF Ref.Functions SFSIP Proxy, B2BUA, Session Admission Control (SAC), SIP Interoperability, SIP DoS protection, SIP Topology Hiding (THIG), and SIP security, privacy and encryption MFVPN mediation, traffic engineering, policy enforcement, rate shaping, bandwith broker, bandwidth theft protection, data integrity, transcoding, RTP translator, Network Address Translation (NAT), and media security, privacy and encryption. RFRouting protocol harmonization OFCALEA implementation; accounting, billing and operational data mediation OF

6. Sohel Khan, Sprint--TR&D. Copyright © Sprint 2005. 6 Other IP Networks AS P- Mw Mw/Mk/Mm Mr Mi MpMnGq Dx Sh Rf/Ro PSTN/ISDN Ie Mi Other IP networks UE Mg Mj Gm ISC Cx Dh Ic Rr/Ro Cx Ib Ia Id PSTN If PDF MGCF I-CSCF BGCF HSS S-CSCF MRFC Mw SLF Charging Function SGF SGW IWF I-BGF RACS AS IBCF SEG NASS IMS functions ETSI TISPAN extensions IP transport (access and core) MRFP A-BGF T-MGF MGW P-CSCF ETSI TISPAN NGN Functional Architecture and Peering Elements SF MF + RF SF MF + RF OF Functions not shown

7. Sohel Khan, Sprint--TR&D. Copyright © Sprint 2005. 7 Wireless Bearer (RTP/IP) Signal (SIP) Conceptual Architecture Composed PE MG: Media Gateway MGC: Media Gateway Controller LD: Long Distance SBC IP Phone PSTN MG SS7 SBC Wireless 3 rd Party IP Network MF RF Session Border Controller (SBC) PSTN Composed architecture integrates Control, Bearer, and Routing planes in same device. Risk: N 2 connectivity, cost, bottleneck, hot-potato route OF SF CSCF Proxy MGCF CSCF Proxy MGCF

8. Sohel Khan, Sprint--TR&D. Copyright © Sprint 2005. 8 Conceptual Architecture: Semi-Composed PE SF IP Phone PSTN MG SS7 Wireless 3 rd Party IP Network SF MPLS Switch/Media Relay SF MF RF H.248/SIP This architecture splits the Control and Bearer + Routing planes in separate devices. This is a one-to-one model Bearer (RTP/IP) Signal (SIP) MG: Media Gateway MGC: Media Gateway Controller LD: Long Distance Edge-Proxy/ CSCF, PDF,… Security + Policy Media Relay/E-LSR Security + Policy Routing CSCF MF + RF Media and Signal do need to flow the same network. OF functions distributed across entities Proxy MGCF CSCF Proxy MGCF

9. Sohel Khan, Sprint--TR&D. Copyright © Sprint 2005. 9 Conceptual Architecture: Centralized (Non-IMS) NNI PE IP Phone Sprint VoIP Other VoIP PSTN MG SS7 Wireless 3 rd Party IP Network SF PSTN Media Relay/MPLS Switch MGCF SF MGCF SF MF RF MF RF MGCF+SF Security + Policy Media Relay/E-LSR Security + Policy Routing Media Relay/E-LSR Security + Policy Routing Control plane of SBC integrates with MGC functions, Bearer + Routing planes integrate with edge routers. One-to-many model ENUM OF functions distributed across entities

10. Sohel Khan, Sprint--TR&D. Copyright © Sprint 2005. 10 Conceptual Architecture: Centralized (IMS) NNI PE IP Phone Sprint VoIP Other VoIP PSTN MG SS7 Wireless 3 rd Party IP Network PSTN Media Relay/MPLS Switch SF MF RF MF RF IBCF+I-CSCF+ SF Security + Policy Media Relay/E-LSR Security + Policy Routing Media Relay/E-LSR Security + Policy Routing Control plane of SBC integrates with CSCF, Bearer + Routing planes integrate with edge routers. One-to-many model ENUM SF CSCFBGCF CSCF SFBGCF OF functions distributed across entities

11. Sohel Khan, Sprint--TR&D. Copyright © Sprint 2005. 11 PDF + P-CSCF S-CSCF I-CSCF SF PCS tower MF + RF OF functions distributed across entities Conceptual Architecture: Centralized (IMS) UNI PE A-BGF

12. Sohel Khan, Sprint--TR&D. Copyright © Sprint 2005. 12 Conceptual Architecture: Distributed NNI PE IP Phone Sprint VoIP Other VoIP PSTN MG SS7 Wireless 3 rd Party IP Network PSTN Media Relay/MPLS Switch SF+ CSCF+ MGCF SF SF+RF+MF RF+MF SF+ CSCF + MGCF Security + Policy Media Relay/E-LSR Security + Policy Routing SIP aware Firewall This model distributes Control, Bearer, and Routing plane functions in different devices across the network SF+ CSCF+ MGCF ENUM RF+MF SF+RF+MF OF functions distributed across entities