Communication joint establishment system and manner

摘要

(57) Abstract The subscriber terminal of the narrow band network which differs (40, 52 and 54) through broadband communication network (48), to be jointed mutually, this broadband communication network, the respective narrow band network (40, 52 and 54) the signaling protocol which is maintained at on support the signaling protocol which differs. 1st narrow band network (40) the call server in, the 1st subscriber terminal (12) from, the narrow band network which differs (52) the 2nd subscriber terminal which is jointed (85) to call (100) responding, chooses the virtual trunk between two networks (202). This virtual trunk has the only circuit identifier, this circuit identifier, first, the 2nd subscriber terminal (85) is used in order to relay address for 2nd network. Next, the only circuit identifier the 1st subscriber terminal (12) is used in order to relay address to 2nd network. When the fact that two joint requests are received with the both ends of the identical virtual trunk is recognized, the processor in 2nd network, direct connect between the 1st and 2nd subscriber terminals through broadband communication network (48), can decide that it is required.