| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission control method in accordance with a detection result by detecting an error of arrival order information caused by a transfer error of a PB signal attributed to a network.SOLUTION: The IP centrex system prevents transmission processing with an erroneous arrival order information by repeating, between a VoIP gateway 3 and a PB receiver 5, transmission of a PB signal and conversion to an arrival order information, comparing pieces of converted arrival information, when a transmission possible condition is met, proceeding to a transmission processing, and, when the transmission possible condition is not met, promoting to confirm with a second telephone about arrival order information. |
