The SR-3 selective ring call processor saves money by eliminating unnecessary phone lines. The SR-3 routes up to three numbers per line.  It installs on a standard POTS line and does not go “off hook” to screen but routes to the appropriate port based on the signature ring pattern for each phone number assigned to a single phone line. The primary phone number routes to port one, secondary number to port two, etc. Multi-Link’s “Smartware™” technology eliminates any user programming by automatically learning the ring cadence. Operation is totally automatic. The barge-in protection feature is optional. Outbound calls are processed in the normal fashion.