[asterisk-users] Prevent multiple sip registrations

[Adrian Marsh]

But then how do you know which is the "correct" user?
This is where the whole point of secrets/passwords should come into
play. If no-one else knows his details, then no-one else can register.
In the land of IP, you can't even guarantee that a remote ends IP will
be the same from minute to minute.. (eg user connects by both wifi and
LAN, initially connects via LAN then gets up and moves to wifi - as many
of my users do daily).