AT Commands User Manual is a single ASCII character in the set 0-9, #, *, A-D. integer in range 0-255, meaning 10ms multiples. is a integer in range 0-255. Default setting: S0=0, meaning automatic answering is disabled. 24 6.13 DTMF and tone generation +VTS Command syntax Description AT+VTS= [, ] This command allows the transmission of DTMF tones and arbitrary tones. These tones may be used e.g. when announcing the start of a recording period. In GSM this operates only in voice mode. If the optional parameter is left out, the tone duration is given by the setting +VTD (see +VTD description). Test command AT+VTS=? +VTS:
(list of s), (list of supported s) OK 6.14 Redial last telephone number ATDL Command syntax Description ATDL This command is used to redial the last number used in the ATD command. This command is abortable. OK or CME ERROR: 6.15 Automatic answer S0 Command syntax Description ATS0= ATS0=2 ATS0= This S-parameter command controls the automatic answering feature of the DCE. If set to 0, automatic answering is disabled, otherwise it causes the DCE to answer when the incoming call indication (ring) has occurred the number of times indicated by the value. OK (Automatic answer after 2 rings) or CME ERROR: ATS0=2 Read command S0: OK ATS0?