Telephone extension switch hook state detection system
US6021192A
Tone detector
US6075855A
Method of accessing a SCP in an ISUP network with partial release
US5944432A
Device for providing disposable sanitary keyboard covers
US5978373A
Wide area network system providing secure transmission
US5930237A
Video conference system with ATM cell reuse
US5956379A
Digital phase lock detector and low-pass filter selector
US5808486A
Glitch free clock enable circuit
US5796594A
Interlocking circuit card faceplate for reduced EMI emissions
CA2198055A1
System for displaying real-time aggregate user responses through a television system
US5854794A
Digital transmission framing system
US5898917A
System for providing enhanced services in cellular radio telecommunication systems using #CCSC based triggers
US5875231A
Telephone call on hold service for a party placed on hold by another party
US5946378A
Information on hold telephony service
US5828735A
Games on hold telephony service
US5729678A
Bus monitor system
US5633634A
Data rate conversion circuit
US5727057A
Storage, transmission, communication and access to geographical positioning data linked with standard telephony numbering and encoded for use in telecommunications and related services
CA2122182A1
Method for rapid prototyping of programming problems
