Specifications

Chapter 17 – Audio Commands
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 215
17.6 AT+VTD Tone Duration
Description: This command refers to an integer <duration> that defines the length of tones transmitted
with the AT+VTS command.
Test Command Syntax: AT+VTD=?
Response: +VTD: (list of supported<duration>s)
OK
Read Command Syntax: AT+VTD?
Response: <duration>
OK
Write Command Syntax: AT+VTD=<duration>
Response: OK
Parameter Description:
<duration>
Duration of the tone in 1/10 second
1...255 Default = 1
17.7 AT+VTS DTMF and Tone Generation
Description: AT+VTS is intended to send ASCII characters or strings which cause the Mobile Switching
Center (MSC) to transmit DTMF tones to a remote subscriber. The command can only be
used during active voice calls and offers the following variants:
• AT+VTS=<dtmfString> allows to send a sequence of DTMF tones with a duration
defined with AT+VTD.
• AT+VTS=<dtmf>[,<duration>] allows to send a single DTMF tone. In this case, the
duration can be indvidually determined during the call.
Test Command Syntax: AT+VTS=?
Response: +VTS: (list of supported<dtmf>s), (list of supported<duration>s)
OK
Write Command Syntax: AT+VTS=<dtmfString>
Response: OK
Write Command Syntax: AT+VTS=<dtmf>[, <duration>]
Response: OK
Parameter Description:
<dtmfString> String of ASCII characters in the set 0-9,#,*,A, B, C, D. Maximal length of the string is 29.
The string must be enclosed in quotation marks (“...”).
<dtmf> ASCII character in the set 0...9,#,*, A, B, C, D.
<duration> Tone duration in 1/10 second. If not specified current setting of AT+VTD is used.
1...255