Self-contained distinctive ring, voice, facsimile, and...

Self-contained fax communications appliance

Self-installable and portable voice telecommunication service

Self-service checkout system utilizing portable self-checkout co

Self-service checkout system utilizing portable...

Semiconductor emulation of tube amplifiers

Sensing device for monitoring conditions at a remote...

Sensing method for monitoring conditions for a remote location

Sequential digital profile for processing analog signals

Serial-port powered caller identification computer interface

Series connected telephone service system

Service system for interconnecting heterogeneous communication t

Shared access to voice and information

Signal amplitude and clock signal frequency selection

Signal converter server network information system control...

Signal proessing circuit for use in telemetry devices

Signaling mechanism for modem connection holding and...

Signaling mechanism for modem connection holding and...

Simple modem log-on authentication

Simultaneous voice and data communications