Christer Holmberg wrote:
But, in scenarios where the outbound- and registrar proxies are NOT
co-located, and only one registrar is used, I see no reason why people
shall be forced to register both contacts to both outbound proxies. In
cases where the contact is access network dependent it may not even be
possible to do so.
I don't understand the last statement. You can put *any* syntactically
valid URI in a Contact of a REGISTER.
Perhaps you mean it won't work once registered, when combined with the
resulting Service-Route. In that case the edge proxy (P-CSCF) may be
asked to route to a URI that is not on the access network that it is
intended to use. But I guess that is just one aspect of the closed
nature of 3gpp.
The problem I see developing here is the idea that the registration
behavior of the UA is dependent on its understanding the topology of the
network. Its one thing to expect it to know of a couple of attachment
points. Its another thing to expect it to know more about what is behind
those attachment points.
Thanks,
Paul
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