AT Commands User Manual 6.2.5 Responses range of is 0-3. range of is 0-2. 22 Verbose Numeric Description OK 0 Acknowledges successful execution of cmd. Connect 1 A connection has been established No carrier 3 The connection has been terminated or the attempt to establish a connection failed Busy 7 Engaged (busy) signal detected No Answer 8 If no hang up is detected after a fixed network timeout Connect 9 Same as Connect but includes the data rate Connect FAX 11 Same as CONNECT but includes the indication related to FAX call 6.3 Select tone dialing T Command syntax Description This set command causes subsequent D command to assume that DTMF dialing is to be used.
Because in GSM DTMF dialing is default, this command has no effect. OK ATT 6.4 Select pulse dialing P Command syntax Description This set command causes subsequent D command to assume that pulse dialing is to be used. Because in GSM DTMF dialing is default, this command has no effect. OK ATP 6.5 Call answer A Command syntax Description ATA This command instructs the DCE to immediately connect to line and start the answer sequence as specified for the underlying DCE. Any additional command that appears after A on the same command line is ignored. The command is abortable. The user is informed that an incoming call is waiting, by the information result code RING or +CRING displayed on TE.
OK 6.6 Hook control H Command syntax Description This command is used to disconnect the remote user. In case of multiple calls, every call is released the waiting calls are not released. OK ATH 6.7 Monitor speaker loudness L Command syntax Description ATL This command controls the volume of the monitor speaker. It has no effect. 6.8 Monitor speaker mode M Command syntax Description ATM This command controls when the monitor speaker is on. The command has no effect.