On 11/09/2010 08:13 PM, Hutton, Andrew wrote:
Hi Martin,
See below.
Regards
Andy
Hi,
The following comments are based on feedback I obtained from
some developers. Sorry that they are sent last minute.
1. Section 4.2 "Call-Completion procedures" (1st Para.). The
text indicates that call completion procedures are not
required if the callee's UAs return a success response. This
is incorrect and in conflict with the definition of "Failed
Call" in the definitions. The requirement for call completion
is independent of the success/failure of the SIP INVITE request.
2. Section 4.2. (2nd para.) Again it is implied that the call
completion procedures seems tied to the state of the
preceding INVITE initiated dialog with the statement
"Eventually, the INVITE fails, or the resulting dialog(s) are
terminated". However it is not the case that the call
completion procedures are independent of the state any
proceeding dialog. For example it should be possible to
initiate call completion even before the original INVITE
dialog is terminated.
I've tried to combine the 2 paragrapgs:
"The caller's UA sends an INVITE to a request URI. One or
more forks of this request reach one or more of the callee's
UAs. However there might be the situation that the calling
user considers the result of the call insufficient to satisfy
his needs, e.g. the INVITE fails and the resulting dialog(s)
are terminated, or the INVITE might succeed at some other UA."
[AndyHutton] - I think it needs to be made clear that the SUBSCRIBE for call
completion can be initiated whatever the state of the original INVITE dialog.
For example a 180 or 200OK response could be received to the original INVITE
request and the user decides to invoke call completion before terminating the
INVITE dialog. Maybe a statement to this effect could be made in section 4.2
and/or section 6.2.
I agree. When the UAS sends any response that includes the
call-completion information, the UAC is free to SUBSCRIBE for call
completion services.
--
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: [email protected]
Check us out at www.digium.com & www.asterisk.org
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