The research and implementation of call establishment procedures between gateways.
网关间呼叫建立规程的研究与实现;
Thereafter, when the packet call establishment response signal is received, the packet data storing part (12) reads the packet data from the memory and deletes it therefrom.
If the packet data is received earlier than the packet call establishment response signal, a packet data storing part (12) of the mobile telephone unit (1) stores the packet data into a memory.