Have phones 2001,2002,2003 in SRST mode in a router.
Calls coming into the system from PSTN should hit 2001, then 2002, then 2003, and so on....and loop back thru again possibly...
Where 5551212001 is an example DNIS delivered on trunk.
no huntstop
alias 1 5551212001 to 2001 preference 1...