H.323 Annex E optional?

[Paul Long]

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 at 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 at SMITHMICRO.COM>
To: <ITU-SG16 at 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?
>