They don't need to be the same. If they differ, then the REGISTER is
for a 3rd party registration. From RFC3261 Section 10.2:
To: The To header field contains the address of record whose
registration is to be created, queried, or modified. The To
header field and the Request-URI field typically differ, as
the former contains a user name. This address-of-record MUST
be a SIP URI or SIPS URI.
From: The From header field contains the address-of-record of the
person responsible for the registration. The value is the
same as the To header field unless the request is a third-
party registration.
Regards,
Michael Procter
> -----Original Message-----
> From: [EMAIL PROTECTED]
[mailto:sip-implementors-
> [EMAIL PROTECTED] On Behalf Of Thirumal Margabandhu
> Sent: 21 February 2007 05:49
> To: [email protected]
> Subject: [Sip-implementors] SIP registrar info - why from and to
fileds
> aresame
>
> Hi,
>
> While SIP registrar to register that time the From and To user name
> filed will be same. What could be a reason for that. Anyone can answer
for
> this..
>
>
>
> Thanks & Regards,
> Thirumal Margabandhu
>
> ARICENT,
> Off: +91(44)- 24330550 - Extn: 341
> Nandanam, Chennai.
>
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