Re: VOIP to router adaptors?
 

Remember that, at the moment, the emergency services will not accept calls from VoIP phones. If you ditch the landline completely then you should make sure that there is always some means of calling them in an emergency - for example using a mobile phone.

Re: VOIP to router adaptors?
 

I've managed to call both the local force and 999 from our Vonage line but the 101 number only worked from our BT line :)