Paul,
Okay, but what if the EP does not indicate that it has this capability? 7.9.2/H.225.0v3 currently says that the EP _shall_ use an unreliable channel if in receipt of an RCF with useAnnexECallSignalling set to TRUE. Period. Regardless of whether the endpoint indicated the capability in its RRQ. The following would eliminate the ambiguity and possible misunderstanding:
7.9.2/H.225.0v3: "useAnnexECallSignalling - If TRUE and supportsAnnexECallSignalling was set to TRUE in the RRQ to which this message is in response, the endpoint receiving this message shall use call signaling exclusively on an unreliable transport channel as described in H.323 Annex E when placing calls."
Paul Long Smith Micro Software, Inc.
-----Original Message----- From: Paul E. Jones To: ITU-SG16@MAILBAG.INTEL.COM Sent: 7/29/99 8:58 PM Subject: Re: H.323 Annex E optional?
Paul,
The endpoint does not indicate a preference-- it is to indicate capability.
The gatekeeper may force an endpoint to use Annex E by setting the flag in the RCF.
Paul
----- Original Message ----- From: Paul Long Plong@SMITHMICRO.COM To: ITU-SG16@mailbag.cps.intel.com Sent: Tuesday, July 27, 1999 7:53 PM Subject: H.323 Annex E optional?
Is H.323 Annex E optional? H.225.0 says that an EP can indicate in an
RRQ
(and a GK, in an LCF) whether it supports H.323 Annex E
(call-signaling over
an unreliable channel), so Annex E is apparently optional. For
example,
7.9.1/H.225.0v3: "supportsAnnexECallSignalling - If TRUE, this
indicates
that the sender of this message is capable of call signalling [sic] on
an
unreliable transport channel as described in H.323 Annex E."
However, H.225.0 also says that via an RCF or ACF a GK can force an EP
to
use Annex E. For example,
7.9.2/H.225.0v3: "useAnnexECallSignalling - If TRUE, this parameter indicates that the endpoint receiving this message shal [sic] use call signalling [sic] exclusively on an unreliable transport channel as
described
in H.323 Annex E when placing calls."
There is nothing in the Recommendations that requires a GK to abide by
the
EP's capabilities. Is this an oversight, or does the EP merely
indicate in
its RRQ a preference for supporting Annex E, and it must therefore
support
this Annex?