Joon, I am a bit confused by the charter of this proposed group, but in general, I am very interested in having a place to discuss generic QoS issues related to voice over a packet data network. Are you planning to include the following topics in your proposed group discussion? 1. VoIP flow reserving resource (flow based RSVP interacting with QoS aware switch/router , SLA based diffserv, SLA based MPLS) - will this group be recommending the model, or will it discuss the pros/cons or interoperability? 2. switch/router resource mgmt (MPLS, Constrained-Based MPLS, diffserv, etc.) - ditto 3. Control of the resource allocation (GK/GW/H.323 endpoints) - problems such as GK granting the bandwidth without having the real control on actual usage (bandwidth mgmt with collaboration from many components.) 4. speech coding/quality - encourage single LBRV to reduce transcoding. 5. absolute delay control. 6. echo cancellation problem with the existence of large jitter. 7. transport efficiency - concerns about header overhead that triggers the proposed solution hop2hop header compression (rfc-2508) and the recent work in MEGACO regarding g.729/udp/rtp/ip/atm & g.729/aal2/atm interworking. Regards, Wen-Ping Ying AT&T Wireless Services PO Box 97059 Redmond, WA 98073 Voice 425-702-2725 Fax 425-702-2568 wying@att.com wen-ping.ying@attws.com

-----Original Message----- From: Joon Maeng [SMTP:Joon_Maeng@VTEL.COM] Sent: Wednesday, March 03, 1999 8:40 AM To: ITU-SG16@MAILBAG.INTEL.COM Subject: H.323/VoIP QoS

Greetings! My name is Joon Maeng. I work for VTEL Corp in USA. I've talked to several companies while I was attending ITU and IETF meetings about establishing an ad-hoc group to address QoS (Quality of Service) issues in TRANSPORTING REAL-TIME TRAFFICS in the packet switched network, especially in the IP network. I was very encouraged by responses from those companies. Most of them agreed that lack of QoS support for real-time traffics was one of major barriers in deploying H.323/VoIP products and the H.323 industry would benefit by having a QoS activity group. I would like to ask if your company would be interested in the activities described in the following:

Proposed name of the group: H.323/VoIP QoS Activity Group.

Motivation: ITU defined a good conference standard, H.323, for the packet network. IETF is actively defining QoS standards for the IP network. The deployment of H.323/VoIP products has been slow partially due to lack of QoS supports in current IP network. The H.323/VoIP industry shall work together to access the issues and provide solutions for the users.

Proposed charter of the group: - Assess QoS issues in transporting real-time traffics (calls with long-duration compared to web-access) in the IP network, - Find the solutions to resolve issues, - Execute solutions via various processes such as building consensus on various QoS solutions among participants, submitting recommendations to standardization bodies if needed, and facilitating inter-operablity testing between QoS standards and application standards, - and education, promotion, etc.

I would expect the final charter and the structure of the group will be determined by the participants and their interests. I would say that everything is open at this time except that the industry shall look at the QoS issues seriously for real-time traffics. I'd like to clarify that the proposed group is not a group to standardize the QoS. It is a group or a forum that is interested in helping and promoting the real-time QoS for H.323/VoIP industry through various methods (to be determined). I plan to set up an email reflector for the initial discussions among participants and decide the following steps based on the discussions. Please email me (joon_maeng@ vtel.com) if you and your company would be interested in joining the initial talks via email reflector. Your comments and suggestions will be greatly appreciated. Regards, Joon