Service and information management system for a...

Service node for a telephony network

Signaling using phase rotation techniques in a digital...

Single or multi-stage switching field for telephone exchanges

Stored program controlled digital public exchange

Switching system

Switching system and method for network having a plurality of te

Switching system data inheritance method and system

Switching system reliability

System and method for backup network glare reduction

System and method for integrated telephony switching

System and method for integrated telephony switching

System and method for precise DTMF signal detection

System and method for providing directory assistance information

System for transmitting DTMF signal and communication...

Systems configured to distribute a telephone call,...