Delivery of identification information

Data processing system, central management unit thereof, and data processing method

Persistent scheduling method and apparatus based on semi-grouping and statistically multiplexing

Charging method and control device for group main line service

Method and system for reporting events in telecommunication networks

System for authentication of network usage

Method, network unit and system for providing subscriber information of a group call to an interception unit

Method and system for handling dynamic incidents

Message modification system and method

System for authentication of network usage

Messaging system

Class-based call request routing

Methods, apparatus and computer program products for allowing access to in-progress calls via calling groups in a voice over internet protocol communication system

Method and system for reporting events in telecommunication networks

Exchange and conference communication method therefor

Premium voice services for wireless communications systems

Telecommunications facility, group of telecommunication facilities, method of configuring and operating such group and software for identifying a client and a facility therein

Method of operating and configuring a telecommunication system; dispatcher software for identifying a client therein and telecommunication apparatus containing same

Call distribution in distributed call centers