| 摘要 |
A method and a system for signaling used in a call setup in a telecommunication system comprising a telephone network, a Centrex exchange belonging to the telephone network and implementing a private number plan, a first telecommunication terminal, which is connected via a first Centrex subscription to the Central exchange, and a second telecommunication terminal, which is connected to the telephone network with a number comprised in the private numbering plan. In the method, a connection is set up between the first and second telecommunication terminals by using the number comprised in the private numbering plan. In the invention, the same APP parameter is used in the Centrex exchange, both for communication with another Centrex exchange and for communication with a VPN exchange, as is used by a OSIG VPN network in VPN ISUP signaling.
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