Hi Keerthi,
For all the SIP entities, Basic SIP rules are same.
IMO, In these cases, Proxy and Registrar should send 416 "Unsupported URI 
Scheme".


Regards,
Alok Tiwari
Aricent

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Keerthi 
Srinivasan
Sent: Wednesday, April 11, 2012 3:59 PM
To: [email protected]
Subject: [Sip-implementors] Proxy and Registrar behavior for the Unknown URI 
schema in From, To, Contact and Request URI

Dear All,

What could be the Proxy and Registrar behavior for the Unknown URI schema
in From, To, Contact and Request URI?

Here is the sample SIP message.

1. Unknown URI schema in Request URI

REGISTER* test:example.com <sip:example.com> *SIP/2.0
To: sip:[email protected]
From: <sip:[email protected] <http://www.example.com/>>;tag=3234233
Call-ID: [email protected]
CSeq: 234902 REGISTER
Max-Forwards: 70
Via: SIP/2.0/UDP 192.0.2.21:5060;branch=z9hG4bKkdjuw
Contact: <sip:[email protected]>
l: 0

2. Unknown URI schema in From Header

REGISTER sip:example.com <sip:example.com> SIP/2.0
To: sip:[email protected]
From: <*test:[email protected] <http://www.example.com/>*>;tag=3234233
Call-ID: [email protected]
CSeq: 234902 REGISTER
Max-Forwards: 70
Via: SIP/2.0/UDP 192.0.2.21:5060;branch=z9hG4bKkdjuw
Contact: <sip:[email protected]>
l: 0

3. Unknown URL schema in To Header

REGISTER sip:example.com SIP/2.0
To: *ram:[email protected]*
From: <sip:[email protected] <http://www.example.com/>>;tag=3234233
Call-ID: [email protected]
CSeq: 234902 REGISTER
Max-Forwards: 70
Via: SIP/2.0/UDP 192.0.2.21:5060;branch=z9hG4bKkdjuw
Contact: <sip:[email protected]>
l: 0

4. Unknown URI Schema in Contact Header

REGISTER sip:example.com <sip:example.com> SIP/2.0
To: sip:[email protected]
From: <sip:[email protected] <http://www.example.com/>>;tag=3234233
Call-ID: [email protected]
CSeq: 234902 REGISTER
Max-Forwards: 70
Via: SIP/2.0/UDP 192.0.2.21:5060;branch=z9hG4bKkdjuw
Contact: <*test:[email protected]*>
l: 0

These message are pass through proxy to registrar. Can you please anyone
help me in the *Proxy and Registrar Behavior*.????
--
Regards,
Keerthi
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