Telecommunications system

The invention system comprises a user equipment, the user equipment comprises a to the first Internet protocol stack of the first Internet protocol (IPV6 operation), and capable according to the second Internet protocol stack of the second Internet protocol (IPV4) operation. The system comprises: For transmitting the second Internet protocol (IPV4) and data packet radio system (GRPS) network, and interworking device. The interworking device and associated opened with user equipment, so the: 1) To act according to the first Internet protocol (IPV6) and data configuration is used for via a packet radio network system (GRPS transmission), automatically according to the second Internet protocol (IPV4) and data; With 2) from the packet radio network system (GRPS), and automatically to the second Internet protocol (IPV4) and data forming integrated network data configuration according to be used to transmit, automatically according to the first Internet protocol (IPV6) and data to a user equipment. The interworking device from the second Internet protocol stack for obtaining expressing Internet's address.