| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve reliable voice call, in a call processing system including a load distribution device.SOLUTION: In a load distribution device 1, an acknowledgement request for confirming the operation state of a TTS server 3a is transmitted, the operation state of a TTS server 3a is determined from a response result for the acknowledgement request, and the operation state of a TTS server 3a is managed as closed state or non-closed state based on the determination result.</p> |
