Abstract: The invention relates to a method for setting up telephone calls between connections of a public telephone network and such connections of the public telephone network as are connected under the control of the method, such as the connections of a distributed call center or a virtual PBX. In the method, a call setup request is received, a connection corresponding to the setup request is sought, and the call is connected to this connection. When using the method according to the invention, data on the state of each controlled connection is entered in a database (8) and, when searching for a connection corresponding to the setup request, the data on the state of at least one controlled connection is accessed from database (8) and a decision, as to which controlled connection to connect the call to, is made using the data checked in database (8).

Abstract: A method and system for changing the state of an A-number. The system comprises control logic for implementing a service based on a B-number and control logic for identifying the calling A-number. The control logic of the system also provides for changing the state of the A-number automatically when the connection from said A number to the B-number has been established.