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