Presented by Dave McDysan dave.mcdysan@mci

1. Overview of VoIP Interoperability Interprovider QoS Aspects from FCC NRIC VI FG3 Final Report, December 2003 Presented by Dave McDysan dave.mcdysan@mci.com http://www.nric.org/fg/charter_vi/fg3/NRIC6FG3FinalReport.pdf

2. Public Telecommunication Services PSTN Internet Network Interconnection Carrier A Carrier B ISP A ISP B Carrier C ISP C Access Networks Wireless/ Satellite Packet Wireless/ Satellite Circuit Wireline Packet Wireline Circuit DSL Cable Users Voice VoIP Data VoIP Data Voice VoIP VoIP Voice Data Data Data Broadband Access

3. Quality of Service (as defined by NRIC VI FG3 Section 3.4.1) • Metrics • Quantitative measures of quality • Voice Quality • Quantities: IP transfer delay, loss ratio, delay variation • ITU-T Y.1540, IETF IPPM • Reference configurations & numerical objectives • ITU-T Y.1541 • Mapping of packet performance to speech quality • Mechanisms • Specific methods to achieve QoS (metrics) • Signaling based admission control • Intra-provider QoS • IETF RSVP signaling, DOCSIS, etc. • Inter-provider QoS • Provision sufficient capacity to meet metrics • IETF Diffserv packet (re)marking, policing, PHBs, and PDBs

4. Table I.1/G.1010 – Performance targets for audio and video applications

5. End-to-end Metrics Table VI.1/Y.1541 – Possible association of Y.1541 QoS classes with differentiated services http://www.itu.int/rec/recommendation.asp?type=products&lang=e&parent=T-REC-Y

6. Hypothetical Reference Path Figure III.3/Y.1541 – Hypothetical reference path for QoS class 0

7. Summary of Standards Gaps • Metrics • Use standard measurement (e.g., RTCP XR RFC 3611) and data interchange formats • 3GPP QoS standards not compatible with Y.1541 • Mechanisms • Best practices for DDoS attacks identification & mitigation • Best practice for DSCP remarking • Standardize Diffserv PHD and PDB at inter-domain boundaries • Industry experience on meeting QoS metrics