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Up to 104 trunk ports including Central Office (CO), DID, Tie, Foreign Exchange (FX), Wide Area Telecommunications Service (WATS), and 800 Service; An Auxiliary Trunk interface for paging and dictation systems; Up to 240 ports that support a combination of the following: Up to 200 ports for voice terminals and auxiliary feature port equipment.
The telephone system will then display the extension number of the parked call so that the call can later be retrieved. At this point, the telephone system will often provide an option for the person to make an announcement through a public address system (often consisting of some or all of the telephone sets and or overhead paging speakers ...
Small paging systems, such as those used in restaurant and retail establishments, often integrate a keyboard and paging system into a single box, reducing both cost and complexity. Paging systems support several popular direct connection protocols, including TAP , TNPP, SNPP and WCTP , as well as proprietary modem- and socket-based protocols.
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The wiring plans evolved into modular hardware building blocks with a variety of functionality and services in the 1A key telephone system developed in the Bell System in the 1930s. [3] Key systems can be built using three principal architectures: electromechanical shared-control, electronic shared-control, or independent key sets.
Instead the system includes a separate paging controller connected to a trunk port of the telephone system. The paging controller is accessed as either a designated directory number or central office line. In many modern systems, the paging function is integrated into the telephone system, so the system can send announcements to the phone speakers.