"Early media" with fast connect

Horvath Ernst ernst.horvath at SIEMENS.COM
Fri Apr 26 07:40:28 EDT 2002

Dear experts,

there seems to be a possible conflict with early media during call
establishment using fast connect.

Clause of H.323 clearly says that the calling endpoint must be
prepared to receive media right away on the ports it indicated in fastStart,
and that the called endpoint may start transmitting media as soon as it
accepts a fastStart proposal (unless, of course, the calling endpoint
indicated also "mediaWaitForConnect"). This is independent of any Progress

Clause, on the other hand, requires that the calling endpoint
provides tones like ringback locally if it did not receive a Progress
indicator #1 or #8. So the calling endpoint is obliged to interrupt/ignore
possible media streams from the called endpoint and replace them with its
own tones. Isn't this a conflict situation?

I would like to hear your opinion or any experience from implementations.

Kind Regards,

Ernst Horvath
Siemens AG
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