Gur,
Your observation leads to the general question that whether it is necessary to support the opening of a media channel during the Q931 call signaling procedure. This concerns other scenario as well. For example, when an H323 endpoint calls a POTS user via a gateway, while the Q931 call signaling is in progress it may be required to have a voice channel opened between the endpoint and gatweay to forward a PSTN special announcement ("sorry, the number you dialed is not in service") back to the endpoint. As I remebered, a while ago there was a decision made from this subject group about h323 implementation, that no capability exchange will take place before the Q931 signaling is completed. I am not sure about the rational behind it, but maybe that can be brought up again for discussion.
I looked at APC-1280 and found no descriptions for the procedure of using the Progress-UUIE which is proposed to solve the above-mentioned problem. Will this be added later on?
Ben Tang Lucent Technologies btang@lucent.com