> 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.
Richard Verhoeven.
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