John Foster writes:
Then what can be the way to get accounting of all calls at originating domain's ser? As if client removes outbound proxy from his IP Phone conf, and the carrier(ser operator) wants to account that user for those calls.
with sip and enum voip becomes a peer-to-peer internet service among many other such services. if a user subscribed to open internet service, there is no way anyone could account for the calls made by that user and it would be a big mistake to turn open internet into a new kind of closed phone network.
-- juha