| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a telephone exchange method and a telephone exchange system which can reduce speech delay or deterioration in speech quality. <P>SOLUTION: The telephone exchange method between telephone terminals makes a call connection between the telephone terminals through a telephone network at a call connection request and sets a channel between the telephone terminals through the telephone network. Then while the channel is disconnected, a channel is set between the telephone terminals through an IP network and speech signals are sent and received through the channel of the IP network. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
