Side-tone adjusting system and method for key telephone system e

Signal detection circuit and telephone apparatus

Signal discrimination circuit for determining the type of signal

Signal processor

Signal transfer arrangement

Signal transmission for transmitting message to destination

Signal-based session management for telephonic applications

Signaling system for broadband communications networks

Simplified uniform network provisioning and restoration

Simultaneous telephone ring apparatus and method

Single line telephone call forwarding device

Single phone line device for automatic interconnection from a re

Single telephone line call forwarding device

Single telephone number access to multiple communications...

Single telephone number access to multiple communications...

Smart internodal transfer for subscriber access in multinode voi

Smart transfer for answer positions

Social error prevention

Software architecture for a computer telephony system

Sorting speakers in a network-enabled conference