Richard Verhoeven wrote:
>
> > Redirecting a ringing call to the contact
> > of an unregister message seems like
> > unobvious behavior to me.
>
> OK. According to the SIP draft, section 4.2.6,
> it is reasonable behavior for a SIP user agent
> to redirect an invitation in progress upon
> a changed registration. So, it is already
> possible to use a normal register request for
> call pickup.
>
> In the same section, it mentions that the
> registrar may use an expire time shorter than
> the one in the request. So, on a SIP user
> agent, the registration can expire immediately
> after the ringing call is redirected. In
> fact, it could be the default behavior.
>
> > We got into
> > trouble for overloading the user of the
> > "contact" header, lets not do it again
> > with REGISTER.
>
> It is part of the SIP draft, so the overloading
> of REGISTER is already there.
You are both right - it is there and it is perhaps not
the best thing. In the light of other comments on this
thread, that there are better ways to achieve the end
result, perhaps this text could be removed. It seems to
me to have been a bit of an after thought anyway.
Cheers,
Neil
--
Ubiquity Software Corporation, UK http://www.ubiquity.net
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