Colleagues, The second gateway decomposition audio call was held Tuesday 11/3 from 11AM to 1PM EST. The following companies were represented on the call AT&T, Dialogic, Ascend, 3COM, Telogy Networks, Bellcore, Lucent, RADVision, Nortel, PakNetx, BT, VideoServer, and others. Tom Taylor presented the TIPHON document 10td101r1 that discussed requirements for Interface A of the gateway decomposition model. The following issues were discussed. - Interface A will be limited to media control only, but events such as DTMF tones or call authorization occur can occur which are relevant to call signaling. A position was stated that when call signaling information is carried in-band form the SCN side, the media gateway component will need to recognize these events and report them to the control gateway component. It will be the control component of the gateway that will act on this information. After some time the discussions were halted and can revisited in Torino. - Management of media gateway resources was discussed. It was pointed out that similar resource management debate for revision 2.0 was a lengthy late night session that resulted in a very limited solution to the problem. The scope of our current discussion is to accommodate voice which makes the resource management problem much more straightforward. A concern was raised that agreeing to a short sighted voice solution that cannot be extended in the future is a bad thing and needs to be avoided. - The load balancing and hot stand-by capabilities common among of SS7 equipment was raised was raised as a requirement for the gateway. There was considerable discussion regarding the definition of these terms and the requirements for such functionality centering around whether this is a problem to solve with protocol or implementation. - A discussion regarding the applicability of using IETFs MGCP work for interface A was raised. The MGCP work was considered premature and not ready for use by the ITU-T. Considerable discussion regarding the desirability to leverage the IETFs work occurred and many agreed that the ITU and IETF should make every effort to arrive at complementary solutions to this problem. The discussion shifted to the B, C and D interface and Mr Sijben presented another TIPHON document 10td91. This document that presented the merits of mapping H.225 messages to ISUP messages. If further stated that H.225 facility UUIEs could be used to transport ISUP (or QSIG) messages, that are not applicable to H.225 messages, through the H.323 network. A proposal for abstracting the ISUP and H.225 and creating an abstract protocol was raised. Another proposals for using UDP to tunnel SS7 through the H.323 network was were suggested but due to time restraints the latter two options were not discussed in much detail. The proponents of these techniques agreed to submit these as APC to the November meeting in Torino. In closing there was some discussion about trying to hold a third call prior to the Torino meeting, but the group decided there was not sufficient time to hold such a meeting. Best Regards, Bryan Hill _________________________________________________________ Bryan Hill VideoServer Inc. (781) 505-2159 bhill@videoserver.com <mailto:bhill@videoserver.com>