Pars Mutaf wrote:
Hello,
Is the SIP trapezoid needed in cellular networks?
This is a deployment question. The very simple logic
of my question is as follows:
For privacy reasons:
- cellular users don't publish their SIP URIs in a
phonebook.
- unpredictable and long SIP URIs are recommended.
Thus the SIP URI will be:
[EMAIL PROTECTED]
which may be too long to read/type as we do
today when two cell phone users meet each other?
We may have a different usage model in mind.
AFAIK cellular users are identified by their phone number, which is used
for humman interchange of addresses all the time. When rendered as a
URI, it can be a TEL URI, or a sip uri. When a sip URI it has a
particular domain, which may not normally be known to the caller. But in
that case they start with a TEL uri and it gets translated along the way
- typically with ENUM. In any case it isn't the caller's concern.
The mobile *device* has a different, contact, address. But callers are
never expected to know that. It is the point of the sip trapezoid
(actually just part of it - the home proxy) to do this translation.
Paul
If so:
Any solution is welcome (e.g. pairing) to help
users exchange their SIP URIs easily. For example,
user names are locally published, I choose the name
of my friend in a wireless network, and get the SIP URI.
If such solution exists:
Why not use it also for exchanging a Mobile IPv6
home address. I.e., I get my friend's SIP URI and
home address concurrently. [bonus result: we can
establish IPsec since we already know our IP addresses].
Conclusion:
By the basic SIP privacy requirement we also came to
solving the routing problem.
What I am missing?
Thanks,
pars
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