Hi Brett,

Yes, with SIP ID, I was referring to no User part in the Request URI.

Thanks for redirecting me to the RFC3842 thread. I got my answer from  
that thread.

Thanks,
Mohit Soni

Quoting "Brett Tate" <[email protected]>:

>> Is the SUBSCRIBE message without SIP ID in Request URI valid?
>>
>> Actually, i have encountered with a SIP UA which sends SUBSCRIBE for
>> Voice Mail notifications where it sends only IP Address in the Request
>> URI and not sending the SIP ID for which it requires notifications.
>>
>> Is such SUBSCRIBE valid?
>
> I'm not sure what you mean by "SIP ID".
>
> If you are referring to no user portion within a SIP-URI, it is   
> valid.  However, it might not produce the result they were   
> expecting.  The following thread discusses some RFC 3842 ambiguity   
> concerning looking at To header's URI.
>
> https://lists.cs.columbia.edu/pipermail/sip-implementors/2009-April/022446.html
>
>
> If you are referring to no URI scheme, it is not valid.
>
> Request-URI    =  SIP-URI / SIPS-URI / absoluteURI
>
> absoluteURI    =  scheme ":" ( hier-part / opaque-part )
>
>





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