Option bus
Option bus adapter
Opto-coupling device between a modem and a telephone line
Orchestration engine as an intermediary between telephony...
Order confirmation system using clip and method thereof, and...
Order processing and reporting system for telecommunications car
Order wire accommodation system for interoffice communications
Order wire device having function for reducing noise in communic
Order wire in telephone communication system
Ordering telephone messages left for a user
Organization chart based call information routing
Organization of a telecommunication network in exceptional...
Origin device based callee identification
Origin device based callee identification
Origin device billing according to caller
Origin device billing according to caller
Origin device order billing according to caller
Originator disposition options for communications session...
Out-of-range warning system for cordless telephone
Outage notification device