Dear Sasha and other NAT/firewall traversal experts, When I reported the Q.5 progress at the recent Japan national meeting for the coming SG16 meeting, Mr. Hideaki Yamada, KDDI, pointed out that G.769/Y.1242 (Circuit multiplication equipment optimized for IP-based networks) uses the following RTP multiplexing: 1/ Ordinary RTP header is used with a particular payload type. 2/ Inside the RTP payload, multiple voice, facsimile and voice band data channels are multiplexed with the "short packet" structure. A relevant part excerpt of G.769 is attached. Since G.769 is under the responsibility of WP1/16, we should at least be aware of this method of media signal multiplexing. I do not have a particular reason to make alignment between H.ma and G.769 due to their different requirements. But if there is anything good for our NAT/firewall traversal solution, please take that into account. -- Best regards, OKUBO Sakae e-mail: sokubo@waseda.jp Visiting Professor Graduate School of Science and Engineering Waseda University ****************************************************************** Waseda University, YRP Ichibankan 312 Tel: +81 46 847 5406 3-4 Hikarinooka, Yokosuka-shi, Kanagawa-ken Fax: +81 46 847 5413 239-0847 Japan H.323 videoconferencing: arranged by advice ******************************************************************