Web User Interface
Advanced - SIP/RTP (Tab) - SIP(Section)__Offer GRUU
Phone User Interface
This setting is used to toggle the support for GRUU (Globally Routable User agent URLs) in SIP. When several phones have the same account, each one of them can be identiﬁed by the proxy through this GRUU ID, which is unique for each phone and stays the same even after reboot.