Solution for the small office home office use. This is a 2 port unit, that can distinguish the rings for both ports A and B.

Product Features
----------------  
two port unit 
works with telephone companies distinctive ring service 
distinguish rings for 2 devices 
option for allowing Caller ID through 
line powered 
wall mountable 

Product Specification
---------------------
Power: line powered
Weight: 0.5 lbs
Dimensions: 4.0"Wx2.75"Hx1.2"D