Pars Mutaf wrote:
On 10/12/07, *Paul Kyzivat* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
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.
In my simplistic view:
I need my packets routed from my device to the other device.
Mobile IPv6 home address does that (including location
management, i.e. locating the target device when I make a call).
I'm not saying that Mobile IPv6 home address corresponds to the
telephone number. We still have a SIP URI for the SIP application.
Then I don't understand what problem you are trying to solve.
If you wish to communicate with me via SIP then you should be trying to
discover my Address of Record (AoR - either a SIP or possibly a TEL
URI). The sip infrastructure will take care of routing to the device.
AoRs will typically be user friendly to the same extent that email
addresses or phone numbers are.
Paul
Thanks,
pars
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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>
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