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

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

Signaling mechanism for modem connection holding and...

Signaling mechanism for modem connection holding and...

Simple modem log-on authentication

Simultaneous voice and data communications

Single button operations for a device

Single tone telephone receiver

Sketching unit for transmission of sketches and notes over norma

Smart card based system for telephone-securized transactions

Smart facsimile machine pick-up