摘要 |
The present invention improves probability of success in connection by enabling effective re-calling even for such a partner apparatus, exchanger, or network that takes a long time in releasing processing when a connection protocol fails at calling in G4, the line is disconnected and re-calling is performed in G3 (fall-back). A fall-back wait timer is provided for waiting for a predetermined time before re-calling is performed by the fall-back function. With this, at the time of fall-back, next communication can be activated in a sufficient time. Therefore, effective re-calling is possible even for such a partner apparatus, exchanger, or network that takes a long time in releasing processing, whereby the probability of success in connection is improved.
|