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Call management system

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Call notification system, method, computer program and...

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Call progress monitor circuitry and method for a...

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Caller controlled network-based timed ring suppression

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Caller-identification receiving apparatus

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Capacitively coupled ring detector with power provided...

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Central office filter system and method

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Circuit device for controlling the actuated state of an electric

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Circuit for evaluating call signals in a telecommunication syste

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Communication apparatus for responding to calls to a different a

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Communication apparatus having a non-ringing call receiving mode

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Communication apparatus having function of generating calling si

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Communication system for activating an optical display in a comm

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Communication terminal device, holds melody sensing method,...

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Communications apparatus, control method therefor and...

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Communications device with improved ring signal detection

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Computer telephony integrated network

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Control circuit for an electrical telephone accessory

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Controllable telephone annunciator

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Crescendo telephone ringer

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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