C.2.11 DTMF and tone generation +VTS

27.0073GPPAT command set for User Equipment (UE)Release 18TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

This command allows the transmission of DTMF tones and arbitrary tones (see NOTE 1). These tones may be used (for example) when announcing the start of a recording period. The command is write only. In this profile of commands, this command does not operate in data or fax modes of operation (+FCLASS=0,1,2‑7).

NOTE 1: D is used only for dialling.

The string parameter of the command consists of combinations of the following separated by commas:

1. <DTMF>. A single ASCII character in the set 0‑9, #,*,A‑D. This is interpreted as a single ACSII character whose duration is set by the +VTD command.

NOTE 2: In GSM this operates only in voice mode.

2. [<tone1>,<tone2>,<duration>]. This is interpreted as a dual tone of frequencies <tone1> and <tone2>, lasting for a time <duration> (in 10 ms multiples).

NOTE 3: This does not operate in GSM.

3. {<DTMF>,<duration>}. This is interpreted as a DTMF tone of different duration from that mandated by the +VTD command.

NOTE 4: In GSM this operates only in voice mode.

Table C.18: +VTS action command syntax

Command	Return
+VTS=as above
+VTS=?	(list of supported <tone1>s),(list of supported <tone2>s),(list of supported <duration>s)