At+Chup Hang Up Call; Switch From Data Mode To Command Mode - Quectel EC25 Command Manual

Parameter
<mode> 0
1

7.5. AT+CHUP Hang up Call

The command cancels all voice calls in the state of Active, Waiting and Held. For data connections, use
ATH.
AT+CHUP Hang up Call
Test Command
AT+CHUP=?
Execution Command
AT+CHUP
Maximum Response Time
Reference
3GPP 27.007
Example
RING
AT+CHUP
OK

7.6. +++ Switch from Data Mode to Command Mode

The +++ character sequence causes the module to switch from data mode to command mode. It allows
inputting AT commands while maintaining the data connection with the remote device.
+++ Switch from Data Mode to Command Mode
Execution Command
+++
EC25&EC21_AT_Commands_Manual
ATH can be used to disconnect the voice call.
ATH is ignored but OK response is returned.
Response
OK
Response
OK
ERROR
90s, determined by network.
//Incoming call
//Hang up the call
Response
This command is only available when TA is in data mode. The
"+++" character sequence causes the TA to cancel the data
flow over the AT interface and switch to command mode. This
allows entering AT command while maintaining the data
connection with the remote server or, accordingly, the GPRS
LTE Module Series
EC25&EC21 AT Commands Manual
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