> If she get's mates on SIP she could then store any special prefixes in
> the phone book on the phone or in the Fritz?

To call people via a SIP address, it has to be put in the Fritz!box'
phonebook.  If she wants to dial normal phonenumbers (even when the call
goes over VOIP), either phonebooks can be used.

> As/when we find this acceptable and drop the NTL line we could then
> move iFritz over to an (my) extension on the BT line / PABX and she
> would then make calls via our BT line or SIP as / when she get's
> friends (specifically b/f to start with) online? I could then plug my
> DECT phone into Fritz and use either SIP / BT (but probably defaulting
> to BT till I get ENUM sorted / understood fully). ;-)

Doesn't she still need a separate number to be reachable on?  Maybe you can
port your NTL number to a VOIP provider? (I don't know if or how this is
possible in the UK)

Anyway, your step-by-step plan should work ok.

> I'm not sure if having one in place already (STC now Multimessage
> MMX MX5) helps matters then?

It's better not to use the PBX in the Fritz!box then, if you already have a
real PBX.

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