Dale beat me to it with the answer.
IMO, since sip stacks need to support at least a few cases of shared
dialog usage, they *ought* to be implemented for the general case of
arbitrary sharing of dialog usage. (Supporting the general case isn't
really harder than a special case.) But obviously not everyone agrees
with me, so you aren't very likely to find this supported.
Paul
Dale R. Worley wrote:
> On Fri, 2006-05-26 at 14:23 +0100, Munish Bansal wrote:
>> Hi All
>>
>> Is the following scenario possible?
>>
>> 1. Create a session using SUBSCRIBE.
>> 2. Send INVITE using the same Call-ID, from tag/To tag as is in SUBSCRIBE
>> session.
>
> It might be theoretically possible. The current terminology would be
> "to create an INVITE dialog usage within a dialog that was created by a
> SUBSCRIBE". But I expect few or no UAs would handle it successfully.
> Generaly, INVITEs can only be used to create dialogs or to modify the
> media session within an INVITE-created dialog.
>
> Dale
>
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