Patent ID: 8798668

Claim:
A call control system that performs call control for a terminal which accesses different radio access network systems, comprising: a communication exchange processing apparatus that includes: an emergency notification call maximum bandwidth storage device that stores a maximum bandwidth for emergency notification calls processed in a radio access network system to which the processing apparatus belongs; an emergency notification call bandwidth measuring device that measures a present bandwidth for emergency notification calls presently processed in the radio access network system to which the processing apparatus belongs; a band ratio computation device that computes a ratio of the present bandwidth to the maximum bandwidth for emergency notification calls; and a band ratio notification device that sends emergency notification call band ratio information which indicates the ratio of the present bandwidth to the maximum bandwidth for emergency notification calls to a radio network control apparatus which is provided in the radio access network system and is connected to the processing apparatus; wherein the radio network control apparatus provided in the radio access network system includes an emergency notification call band ratio information sending device that sends the emergency notification call band ratio information to a terminal which is connected to the radio network control apparatus by radio communication, and wherein the terminal includes: an emergency notification call band ratio information receiving device that receives the emergency notification call band ratio information from each of the different radio access network systems; and a call connection processing device that issues an emergency notification call connected to the radio access network system which sent the emergency notification call band ratio information that indicates a minimum ratio.