A telephone company service that allows one physical phone line or group of lines to provide inbound service for several phone numbers. When a call comes into a DID line, the phone company sends a signal on the line that indicates which phone number the call is for. Network fax servers can use DID data to route inbound calls to specific offices, departments, and individuals. The fax server software uses this code to determine the final destination of the fax, much as it does in DID routing. DTMF routing does not require DID lines or equipment but is less reliable and less convenient to use.
Ground start A phone-line signaling method used by many PBXes and large phone installations.
The most commonly used fax machine standard. Group III machines use V.29 fax modems communicating at 14.4 Kbps. LCR software uses a table of area codes to determine which fax server should handle an outbound fax. Once the route is determined, IP fax servers transmit the fax over an IP network to the server closest to the destination number. LCR can provide significant cost savings for organizations with multiple business locations.