I think you are correct.
 
It doesn't mean we couldn't re-use reg-id for other purposes however.


________________________________

        From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL 
PROTECTED]
        Sent: Tuesday, October 07, 2008 20:30
        To: [email protected]
        Subject: [Sip] Is GRUU generated in the case of registration with 
instance-ID and reg-ID
        
        

        Hello, 

        Both Outbound and GRUU drafts make use of the instance-ID for different 
purposes during SIP registration. In GRUU only the instance-ID is needed to 
generate a GRUU. For Outbound both, instance-ID and reg-ID are needed.

        My question now is, whether a GRUU will be generated when a REGISTER is 
received at the registrar, which indicates both reg-ID and instance-ID in the 
Contact header. Reading outbound, it seems like instance-ID + reg-ID are *only* 
used for outbound purposes. 

        Thanks a lot for your help. 

        Best regards 
        Georg 

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