watched user prefers to communicate if the devicetype is u201c dns u201d the requests are to be routed through the sip proxy network using dns uri addressing if the devicetype is u201c e164 u201d for example a phone number is also included affinity may also be used to establish relative preference when multiple preferred devices are listed a label is included so the user can describe his her preferences if desired custom properties lt archenemy aggregate u201c append u201d name u201c doctor nobody u201d comment u201c this guy is pretty tricky be careful if you meet him u201d gt up to this point the invention has been described with respect to the interaction between one or more users that act as watchers a computing device and a corresponding user being watched however in many instances the user being watched may have more than one device registered with the network device at a time in such cases presence information is generated by each of the devices resulting in several presence documents being generated and exchanged with the server that handles presence administration according to various embodiments of the invention presences documents generated by multiple devices of a user are aggregated into a single document there are a variety of ways in which this can be done but one implementation involves the following c the activity.