| 摘要 |
The invention relates to a method of controlling change-over of a connection route between media gateway apparatuses, and a call agent apparatus. During communications, a connection route of deteriorated quality is changed over to a connection route of high quality selected from a plurality of IP networks. Thus, the transmission quality is maintained, and high-quality transmission services are provided at low cost. In a voice/data integrated network having subscribers lines accommodated in STM channel switches LS 1 and LS 2 connected to an IP network via media gateway apparatuses MG 1 and MG 2 respectively, the media gateway apparatuses MG 1 and MG 2 collect/edit real-time packet quality information of IP packets for each call, and post the quality information to a call agent CA. The call agent CA updates packet quality information for each connection route based on the packet quality information, and transmits an instruction, for changing over a connection route of a call at a deteriorated quality level to a connection route of good quality, to the media gateway apparatuses MG 1 and MG 2.
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