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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