Methods for establishing a phone call between a subscriber and an additional part, and to establish a call from a calling party to a called party.Telecommunications system including at least one subscriber for voice traffic and a telephone central office, access link between a subscriber for voice traffic and a telephone central office.The telecommunications system to support traffic of telephone and at least one subscriber, and telephone central office

摘要

Methods to establish a phone call between a subscriber and an additional part, and to establish a call from a calling party to a called party.Telecommunications system including at least one subscriber for voice traffic and a telephone central office, access link between a subscriber for voice traffic and a telephone central office.The telecommunications system to support traffic of telephone and at least one subscriber, and telephone central office.The invention provides a hybrid arrangement, which allows an existing circuit switched telephony network by being folded in a packet switched network.The underlying transport circuit switched network is replaced with that of a packet switched network based on IP (30), while the circuit switched infrastructure.Such as terminals, telephone centrals and the like are kept.In the preferred invention achievements, both a subscriber (10, 11, 20, 21) and a local telephone system (40, 50) are connected and separated.A packet switched network based on IP as the Internet (30).The signalling between the subscriber (10, 11, 20, 21) and a telephone exchange (40, 50) is effected using a protocol of the user to the network standard, such as for PSTN and ISDN bri V5.1 or DSS 1 to ISDN pri.This protocol of user to network pattern is overlaid on an IP based network protocol, such as TCP or UDP in IP.