| 摘要 |
A communication terminal device transmits an ANSam signal (step S2). When the device does not detect a CM signal within a prescribed period (NO in step S3 and YES in step S4), the device transmits a DIS signal with a bit indicating that the communication procedure of the V.8 mode can be carried out (step S5). Then, when receiving a CI signal (YES in step S6), the device transmits an ANSam signal (step S21 in FIG. 3), and afterwards if a CM signal cannot be detected (NO in step 22), and the number of detected CI signals is a prescribed number or more (YES in step S25), the device transmits a DIS signal without a bit indicating that the communication procedure in accordance with V.8 mode can be carried out (step S26).
|
