Communication system using switching apparatus

Details Communication system using switching apparatus Communication system using switching apparatus

H - Electricity

04

M

344/28

H04M 3/22 (2006.01) H04Q 3/00 (2006.01) H04Q 3/545 (2006.01)

Patent

CA 1277752

ABSTRACT OF THE DISCLOSURE In a telephone switching apparatus having an inter-office interface consisting of a plurality of communication circuits having different priorities and a control line for transfer of call control signals, a first circuit having the highest priority is hunted from the idle one of said communication circuits upon setting of a call and the communication is started. During the communication, if a second circuit having a higher priority than that of the first circuit becomes idle, by communicating a control signal to switch the circuit between the switching apparatuses, the busy circuit for the call is switched from the first circuit of a low priority to the second circuit of a high priority.

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