Key telephone system accommodating both digital and analog telep

Details Key telephone system accommodating both digital and analog telep Key telephone system accommodating both digital and analog telep

1989-10-20

1990-09-18

Schreyer, Stafford D.

Telephonic communications

Multi-line or key substation system with selective switching...

379157, 379164, H04M 100, H04M 172

Patent

active

049583697

ABSTRACT:
In response to a calling-out command from an extension telephone set connected to an extension line from the main equipment of a key telephone system, an ISDN line and a PSTN line which are accommodated as external lines are searched for a free external line, until a free external line is acquired. A determination is made as to which type is the acquired external line, whether it is the ISDN line or the PSTN line. On the basis of the result of this determination, different kinds of audible sound are sent to the extension telephone set, thereby informing the type of the acquired external line.

REFERENCES:
patent: 3789152 (1974-01-01), Medill et al.

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