Preliminary communication identification
Premises gateway and premises network interfaces for...
Presence based DTMF signaling enablement of voice...
Printer-option system for exchanging data between a terminal and
Priority line switching system
Private automatic business exchange
Private branch exchange
Private branch exchange
Process for data communications and a data communications system
Processor-assisted communication system using tone-generating te
Product registration system
Program material screening device
Programmable data access arrangement having combined command sig
Programmable messaging system for controlling playback of messag
Programmable system controller for remote devices
Programmable telephone interface device
Programmable universal modem system and method for using the sam
Provision of proprietary and enhanced capabilities in Group 3 fa
PSTN appliance security system with reduced PSTN traffic loading
Public access facsimile system