Patent ID: 7606261

Claim:
A method of routing calls in a telecommunication system comprising: a mobile communication system comprising at least one mobile services switching center and at least one base station connected thereto, and mobile stations wherefrom a telecommunication connection is established to the mobile services switching center through the base station by using a first predetermined telecommunication protocol on a radio connection, a packet data network, external to said mobile communications system, wherein data to be transmitted is transmitted in data packets, according to a packet data network protocol specified for the packet data network, the packet data network protocol being other than the first predetermined telecommunication protocol, a server communicating with the mobile services switching center and said packet data network, the server being configured to arrange messages according to the first predetermined telecommunication protocol arranged as such into data packets according to said packet data network protocol and supplied from the mobile communication system to be forwarded through said packet data network to a terminal, the server being further configured to decompress messages according to the first telecommunication predetermined protocol arranged as such in the data packets according to said packet data network protocol and supplied from the terminal through the packet data network to be forwarded to the mobile communication system, and at least one terminal of a second wireless communication system, other than said mobile communication system, said terminal being arranged to support said packet data network protocol, the terminal being other than one of said mobile stations in the mobile communication system, the method comprising: establishing a telecommunication connection from said terminal to the mobile communication system by establishing a first part of said telecommunication connection from said terminal to said packet data network by using a second predetermined telecommunication protocol, other than said packet data network protocol and other than said first predetermined telecommunication protocol, through which a first part of the data packets according to said packet data network protocol are configured to be transmitted, the telecommunication connection comprising a second part from said packet data network to the mobile communication system via the server, through which the second part of the messages according to the first predetermined telecommunication protocol can be transmitted; transmitting and receiving by said terminal over said telecommunication connection established using the second predetermined telecommunication protocol the messages according to the first predetermined telecommunication protocol as the data in said data packets, the messages being arranged as such into the data packets according to said packet data network protocol; and emulating, by the terminal of said second wireless communication system, a mobile station of said mobile communication system.