LandOfFree - US Patents - Listing for Telephonic communications,Supervisory or control line signaling

Telephonic communications – Supervisory or control line signaling – Substation originated

Communication system

Telephonic communications – Supervisory or control line signaling – Substation originated

Communication system

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Communication system

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

Communication system for activating an optical display in a comm

Telephonic communications – Supervisory or control line signaling – Substation originated

Communication system having an automatic dialer

Telephonic communications – Supervisory or control line signaling – Substation originated

Communication terminal

Telephonic communications – Supervisory or control line signaling – Substation originated

Communication terminal call reminder with automatic dialing

Telephonic communications – Supervisory or control line signaling – Substation originated

Communication terminal device

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Communication terminal device

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

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

Telephonic communications – Supervisory or control line signaling – Substation originated

Communication terminal telephone directory with dynamic director

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Communications apparatus

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

Communications apparatus, control method therefor and...

Telephonic communications – Supervisory or control line signaling – Signal receiver

Communications device including an improved CPE alerting...

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

Communications device with improved ring signal detection

Telephonic communications – Supervisory or control line signaling – Substation originated

Communications headset

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Communications interface providing isolation and ringdown featur

Telephonic communications – Supervisory or control line signaling – Substation originated

Communications system using portable recording medium

Telephonic communications – Supervisory or control line signaling – Substation originated

Communications system using portable recording medium