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PIDF-ICE Basic idea: use a presence notification as an ICE ‘initiate’ message Essentially requires presentities to gather the same address set they would assemble for SDP Watchers can begin ICE tests against those addresses Subsequently display the results of the tests as ‘connectivity status’ of the target Green/yellow/red (but application-specific) Lets you know, before you attempt an INVITE, if it is probable that media can be set up |