Of course you can use a username and a FQDN in the contact. Without it,
i.e. using IP-addresses, proxies would be quite handicapped.
Let me quote 3261:
"The location service is just an abstract concept. It generally
contains information that allows a proxy to input a URI and receive a
set of zero or more URIs that tell the proxy where to send the
request. Registrations are one way to create this information, but
not the only way. Arbitrary mapping functions can be configured at
the discretion of the administrator.
Finally, it is important to note that in SIP, registration is used
for routing incoming SIP requests and has no role in authorizing
outgoing requests. Authorization and authentication are handled in
SIP either on a request-by-request basis with a challenge/response
mechanism, or by using a lower layer scheme as discussed in Section
26."
But, I have a feeling You're after something else, but don't know what :-)
John Aronsson
-----Ursprungligt meddelande-----
Från: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] För Raj Jain
Skickat: den 7 januari 2008 20:50
Till: [EMAIL PROTECTED]
Kopia: [email protected]
Ämne: Re: [Sip-implementors] Using domain names in Contact URI
On Jan 7, 2008 1:54 PM, <[EMAIL PROTECTED]> wrote:
> I'm not sure whether it makes to sense to use domain names in a
> Contact URI. The SIP ABNF allows it. Any thoughts or suggestions on
> this?
>
> It is legal to do so, and it is mandatory that a registrar/proxy
> support it correctly, as the registrar does not control the contact
> addresses that UAs will present to it.
Define "support it correctly". If my Registrar uses its own database
to resolve a domain name in a Contact URI instead of querying DNS,
then am I violating any normative statements made in any RFC?
> I don't know what the constraints in your design are, but have you
> considered using a URI-parameter? If your redirection service carries
> the URI-parameter form the AOR to the registered contact, then you can
> have an unlimited number of different SIP URIs that map through one
> registration to distinct contact URIs.
Let me try to understand this. We didn't really have a redirection
service in mind. We were thinking that a Registrar and a Proxy will be
sufficient. Our goal is to bind hundreds of Contact URIs to one AoR.
We're saying that we can't carry all those Contact URIs in-line in a
REGISTER message so lets carry them "indirectly" and use an OOB
mechanism. I'm not sure how a Redirection Service, URI parameter helps
this situation.
--
Thanks,
Raj
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