ZyXEL Elite 2864 User Guide - Page 189

(2) The DTE sends a shielded code. (3) A DTE/DCE Inactivity Timer time-out occurs. Upon termination of the voice receival state, the DCE will append a character pair, followed by the OK result code. The DCE then returns to the Voice Command State. The Inactivity Timer is in effect while the receival operation is in progress. If the DTE wishes to use this timer and stop the DCE from performing unwanted restarts, the DTE must assure that there is data being sent from the DTE to the DCE often enough to refresh the timer; the DTE may use the shielded code as a no-operation command to refresh the timer. • AT+VTS= This command causes the DCE to issue DTMF single frequency tones, and optionally, double frequency tones. The DCE accepts to abort playing tones, returns the OK result code, and then returns to the Voice Command State. The tone generation string consists of elements in a list with each element separated by a comma. Each element can be: 1) A single ASCII character in the set 0-9, A-D, #, and *. The DCE interprets the single ASCII character as a DTMF digit with a duration given by the +VTD command. 2) A string enclosed in square brackets, "[]". The DCE interprets the values in square brackets as a general dual tone and duration selection. The quantity within the square brackets consists of a three element list. The first element is the first frequency, the second element is the second frequency, and the third element is the tone duration in 10 ms intervals. 3) A string enclosed in curly braces, "{}". The DCE interprets the quantity in the braces as a DTMF tone with a different duration than that given by the +VTD command. The quantity in the curly braces consists of a two element list. The first element is the DTMF tone character and the second element is the tone duration in 10 ms intervals. For every inter-element comma in the list, the DCE pauses for an interval set by the +VTD command. • AT+VTS=? This command causes the DCE to report the allowable tone frequency range and duration range. The ZyXEL 2864 series modems support two tones, both in the frequency range of 20 to 4800 Hz, and a duration range from 0 to 10 seconds. The response is as follows: (20-4800),(20-4800),(0-1000), 0-9, A-D, *, # OK 16-13