There are two big problems with 999 on voip. Firstly, there is no way of working out where people on the internet are. Secondly, BT is a gigantic paper generating machine.
Whilst we wait for Cisco and the IETF to solve the first problem, we have to deal with the second, and the only way to do 999 over VoIP in the UK is to send BT’s operators a CSV file of caller id and address. You can do this (I think) upto 4 times a day.
Then you connect the call over the normal TDM network like a regular 999 call, set a few extra flags, and hope the 999 operator picks up on the big flashing warning they get on screen which says “this address is probably meaningless”.
Peter Gradwell on why 999 on VOIP in Britain is doomed
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