Call Related Commands TRM250
Call Related Commands
ATA Answer an Incoming Call
The command connects the module to an incoming voice or data call indicated by a RING URC.
ATD Mobile Originated Call to Dial a Number
The command can be used to set up outgoing voice and data calls. Supplementary services can also be controlled with this command.
ATH Disconnect Existing Connection
The command disconnects circuit switched data calls or voice calls. AT+CHUP is also used to disconnect the voice call.
AT+CVHU* Voice Hang up Control
The command controls whether ATH can be used to disconnect the voice call.
AT+CHUP* Hang up Call
The command cancels all voice calls in the state of Active, Waiting and Held. For data connections, use ATH.
+++ Switch from Data Mode to Command Mode
The +++ character sequence causes the module to switch from data mode to command mode. It allows inputting ATcommandswhile maintaining the data connection with the remote device.
ATO Switch from Command Mode to Data Mode
The command resumes the connection and switches back from command mode to data mode.
ATS0 Set Number of Rings before Automatically Answering Call
The command controls automatic answering mode for the incoming calls.
ATS6 Set Pause before Blind Dialing
The command is implemented for compatibility reasons only, and has no effect.
ATS7 Set Timeto Wait for Connection Completion
The command specifies the amount of time(unit: second) to wait for the connection completion in case of answering or originating a call. If no connection is established during the time, the module disconnects from the line.
ATS8 Set the Timeto Wait for Comma Dial Modifier
The command is implemented for compatibility reasons only, and has no effect.
ATS10 Set Disconnection Delay after Indicating the Absence of Data Carrier
The command determines the amount of time(unit: tenths of a second) during which the UE remains connected in absence of a data carrier.
AT+CSTA* Select Type of Address
The Write Command selects the type of number for further dialing commands ATD according to 3GPP Specifications. Test command returns values supported a compound value.
AT+CLCC List Current Calls of ME
The execution command returns the list of all current calls. If the command is executed successfully, but no calls existed, no information response but OK is sent to TE.
AT+CR Service Reporting Control
The command controls the module whether or not to transmit an intermediate result code +CR: <serv> to the TE when a call is being set up.
If it is enabled, an intermediate result code is transmitted at the point during connect negotiation at which the TA has determined which speed and quality of service will be used, before any error control or data compression reports are transmitted, and before any final result code (e.g. CONNECT) is transmitted.
AT+CRC Set Cellular Result Codes for Incoming Call Indication
The command controls whether or not to use the extended format of incoming call indication. When it is enabled, an incoming call is indicated to the TE with unsolicited result code +CRING: <type> instead of the normal RING.
AT+CRLP Select Radio Link Protocol Parameter
The Write Command sets radio link protocol (RLP) parameters used when non-transparent data calls are originated.
AT+QECCNUM Configure Emergency Call Numbers
The command can be used to query, add and delete ECC numbers (emergency call numbers). There are two kinds of ECC numbers: ECC numbers without (U)SIM and ECC numbers with (U)SIM. The default ECC numbers without SIM is 911, 112, 00, 08, 110, 999, 118 and 119. The default ECC number with (U)SIM is 911 and 112.911 and 112 will always be supported as ECC numbers, and cannot be deleted. ECC numbers can be saved into NV automatically. If the (U)SIMcard contains ECC file, the numbers in ECC file can also be regarded as ECC numbers.
The maximal supported ECC numbers of each type is 20.
AT+QHUP* Hang up Call with a Specific Release Cause
The command can terminate a call or calls (including both voice call and data call) with a specific 3GPP TS 24.008 release cause specified by the host.