15.8. Globally Routable User Agent URIs (GRUUs)

15.8.1. Motivation

We have seen in previous chapters that a user is identified, for SIP purposes, by the address-of-record (AOR), which typically has the form of a SIP URI (e.g., sip:john@ sea.com). The AOR identifies the user, but the user may have more than one device (PC, laptop, mobile, and so on), all of them corresponding to the same user, the same AOR. When the UA in a device is turned on, it registers its contact address for the AOR. If, say, three User Agents, one in each device (PC, laptop, and mobile), are registered, the registrar would show an AOR connected to three different contact addresses. This situation is depicted in Figure 15.13.

Figure 15.13.

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