| 摘要 |
PROBLEM TO BE SOLVED: To provide a voice relay server able to house a large-scale of channels that reduces a delay time to the utmost and prevents deterioration in the quality of a reproduced voice in the case of relaying a speech of a telephone set connected to a public network or a speech between mobile phones connected to a mobile network. SOLUTION: The voice relay server relaying a speech of a telephone set is installed at a connecting point between an IP network and a public network or a mobile network. When caller and called communication terminals are telephone sets, the voice relay server selects a PCM with a small processing time and a low processing load for its voice coding system, and selects a coding system used for the mobile network in order to reduce the number of times of code conversion in order to relay a speech with the mobile phone. |
