[asterisk-users] Prevent multiple sip registrations

[Adrian Marsh]

Hmmm.  Then SIP is not your solution. SIP servers have no ability to
tell one user from another if they share secrets.
Strongly suggest that you change the ethos behind how you're manage
you're users. Unfortunately, with the business plan as-is, you're using
end-user "trust" not to abuse the system.

The *ONLY* way I can see a setup working for you, is if you do use a
backend DB to log when the user last registered, and set a time limit
(eg if < 1hour since last change then reject) - but its principally
flawed (what if a genuine user does move from wifi to fixed and back
again), and would probably only work well for home-users who aren't
mobile at all. Not sure how you'd implement this into Asterisk though.

Adrian Marsh