Communications

Telephonic Communications

Pbx To Central Office Signalling (e.g., Direct Outward Dialing)

No:5452349

Call forwarding control system for isdn

No:5161180

Call interceptor for emergency systems

No:7099454

Caller identification in a communication system

No:3936613

Camp-on detecting system for automatic telephone exchange

No:5572586

Communication control apparatus and method and communication exchange apparatus and method

No:5587999

D channel packet communication system and a method of d channel packet communication

No:6351526

Dialing process for ip telephony

No:5646985

Hierarchical switch support of services for subscribers of independent private branch exchanges

No:5473672

Inband messaging system interface of a pbx

No:5970130

Independent central office which provides local and long distance calling services to new residential and commercial developments

No:5185741

Inter-network connecting system

No:5974133

Method and apparatus for facilitating communication across multiple locations

No:5363435

Method and apparatus for seizing a trunk circuit in a telecommunications private branch exchange

No:6970551

Method and system for identifying calls having the same originating number and destination number

No:6567514

Method and system for processing telephone calls via a remote tie-line

No:6744880

Method for creating a telephone digital switching platform

No:7330443

Method for providing cti services or features via communication channel having communication connections

No:5778058

Method of adding a new pbx and new pbx port to an existing pbx network

No:6453034

Method of and system for extending internet telephony over virtual private network direct access lines

No:6463052

Method, system and apparatus for telecommunications control

No:3736383

Multicustomer centralized call diverter

No:6707897

Private branch exchange

No:7463728

Private branch exchange

No:5475744

Private branch exchange capable of adding a calling station id number to the call signal

No:6819665

Private branch exchange implemented using h.323 gatekeeper

No:5422943

Private branch exchange networks

No:5337352

Private branch exchange system having an automatic optimal route selecting mechanism

No:5003573

Self-diagnosis of loop start and ground start trunk interfaces

No:5621727

System and method for private addressing plans using community addressing

No:5574783

System and method for providing competitive access telephone service for telephones connected to a remote terminal of the monopoly service provider

No:5999608

Telephone exchange apparatus having an integrated services digital network interface

No:5267305

Transparent inband signaling

No:6223054

Wireless local loop system utilizing independent central offices located in new residential and commercial developments