Joint Session ACHIEVING MULTIMEDIA QOS OVER HYBRID IP/PSTN INFRASTRUCTURES Session Co-Chairs: Neal Seitz – Vice Chair, SG 13; Chair, WP 4/13 (Network Performance and Resource Management) Federico Tosco – Vice Chair, SG 16; Chair, WP 2/16 (Multimedia Platform and Interworking)

INDUSTRY GOALS Define QOS requirements for real-time services (e.g., signal delay, fidelity, service availability) Implement real-time QOS mechanisms in networks (e.g., traffic control, resource allocation) Implement QOS signalling among network providers (e.g., H.248/MEGACO, BICC)

PANELISTS AND TOPICS Helmut Schink (TIPHON) – VoIP QOS requirements Les Cottrell (SLAC) – ESnet user QOS measurements Chuck Dvorak (SG 12) – ITU-T QOS responsibilities Susumu Yoneda (SG 13) – IP traffic / congestion control Mike Buckley (SG 16) – Multimedia QOS signalling Tom Taylor (IETF) – Media gateway control standards Greg Ratta (SG 11) – BICC signalling standards

SESSION PLAN (Coffee break) 30 m. Objectives and discussion questions ….… 10 m. Panelist overview presentations ...…….… 70 m. (Coffee break) 30 m. Question-driven discussion period …..….. 60 m. Summary of views / action items ..……… 10 m. ______________ 180 m.

FOR THIS SESSION, “QOS” INCLUDES: “Customer-perceived” QOS (voice, video, data, control) • Subjective measures (summarize human judgment) • Objective measures (mimic perception and judgment) “Terminal-to-terminal” and “Network” QOS • Speed, accuracy, dependability of defined functions (e.g., IP packet transfer delay, IP packet loss ratio) • Service Availability (data transfer and call control) Distinguished from “QOS mechanisms” that enable “QOS” to be provided by networks and terminals.

Terminal-to-Terminal QOS MULTIMEDIA QOS ELEMENTS Multimedia Terminal Network QOS Terminal-to-Terminal QOS  Speed, Accuracy, Dependability  Service Availability MULTIMEDIA QOS ELEMENTS  Voice  Video  Data  Call Control Customer-Perceived QOS  Subjective Measures  Objective Measures Control Network Bearer

QOS COMMITMENT MODELS Best effort (traditional Internet) One size fits all (traditional PSTN) Selectable network behavior (e.g., Diffserv) Selectable performance values (ATMF) Selectable QOS Classes (ITU-T SG 13) Goal: Enable QOS allocation and/or concatenation in a multiple technology, multiple service provider environment.

QOS MECHANISMS Admission control / traffic management Priorities (e.g. for queuing resources) Resource reservation Traffic segregation (transport and routing) Protection switching / rerouting Can be implemented per packet type, per source or destination, per aggregate, or per “connection.”

SOME DISCUSSION QUESTIONS 1. What QOS levels will be required to support interactive multimedia communications and other real-time IP network services? 2. Can a limited set of QOS classes be defined to cover the wide range of services that will be supported by future IP networks? 3. How will QOS classes be supported by IP network traffic handling or resource reservation mechanisms? 4. How will control of QOS mechanisms be coordinated in a multi-technology, multi-provider environment?

FURTHER DISCUSSION QUESTIONS 5. How will QOS differentiation be verified, among networks and on an end-to-end basis? 6. Will it be possible to make quantitative QOS commitments (e.g., assured MOS levels) to customers of multi-provider connections? 7. By what processes will the industry converge on a workable scheme for supporting end-to-end QOS? Additional questions are encouraged …

SESSION OBJECTIVES • Promote cooperation and a common vision among ITU-T, IETF, and regional standards groups addressing multimedia QOS needs in a hybrid IP/PSTN environment. • Identify specific goals for cooperative action in the development of IP/PSTN QOS standards. • Identify “volunteers” to spearhead such action.