This is largely an issue of semantics. A registrar is something that
processes REGISTER requests. So if you send an OPTIONS message and some
server responds to it, in some sense it can be argued that it is not a
registrar, or more properly it is not acting as a registar at that time.
Also, you typically don't address the registrar. Instead you address the
domain of your AOR in the REGISTER. (I.e. a register for
sip:[EMAIL PROTECTED] is sent to sip:atlanta.com.) Often that is a proxy
that either also acts as a registrar, or else has local policy to route
REGISTER requests to a specific registrar node. So when you talk about
sending OPTIONS to the registrar, I guess you mean alice would send it
to sip:atlanta.com. That would presumably be responded to by the
atlanta.com "proxy" (but acting as a UA). If there is a separate
registrar, atlanta.com probably would not route the OPTIONS to it.
In any case you can send an OPTIONS to any sip address. If the recipient
is willing and able to respond it will.
Paul
Holger Schmidt wrote:
> Dear all,
>
> Just one question:
> According to RFC 3261, is it possible to send an OPTIONS request to the
> registar?
>
> Thanks,
> Holger Schmidt
> _______________________________________________
> Sip-implementors mailing list
> [email protected]
> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
>
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