System for integrating mobile telecommunication terminals into a private telecommunication system

A system for integrating mobile terminals into a private telecommunication system, including first and second servers respectively associated with a public mobile telecommunication system accessed by said mobile terminals and with said private telecommunication system, enabling setting up of incoming or outgoing calls relating to said mobile terminals and in accordance with a private numbering scheme specific to said private telecommunication system and holding first and second service data relating to mobile terminal users, and means for cooperation between said first and second servers for setting up calls relating to said mobile terminals and/or managing service data,

• wherein said cooperation means includes a network interconnecting said servers,
• wherein service data information in said first service data is transferred over said network from said first server to said second server, and
• wherein second service data is based on said service data information from said first server.