Telephone system
Telephone usage control
Telephonic switching system with automatic port assignment capab
Telephony controller with functionality command converter
Telephony security system
Telephony security system
Telephony security system
Telephony security system
Telephony security system
Telephony security system
Termination number screening
Third party regulation of calls based on the caller and...
Three way call detection
Three way call detection by counting signal characteristics
Three-way call detection and response system
Three-way call detection and response system
Three-way call detection system
Three-way telephone call prevention system and method
Tightly integrated cooperative telecommunications firewall...
Time based regulation of use of a telephone line