Quectel UG Series User Manual

UMTS/HSPA Module Series
WCDMA UGxx AT Commands Manual
WCDMA_UGxx_AT_Commands_Manual Confidential / Released 91 / 247
Parameter
7.5. AT+CHUP Hang up Call
AT+CHUP cancels all voice calls in the state of Active, Waiting and Held. For data connections, use ATH.
Example
RING //Incoming call
AT+CHUP //Hang up call
OK
7.6. +++ Switch from Data Mode to Command Mode
The +++ character sequence causes the module to switch from data mode to AT command mode. It
allows inputting AT commands while maintaining the data connection with the remote device.
<mode> 0 ATH is disconnected
1 ATH is ignored but "OK" response is returned
AT+CHUP Hang up Call
Test Command
AT+CHUP=?
Response
OK
Execution Command
AT+CHUP
Response
OK
ERROR
Maximum Response Time
90s, determined by network.
Reference
3GPP 27.007
+++ Switch from Data Mode to Command Mode
Execution Command
+++
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 you to enter AT command while maintaining the
data connection with the remote server or, accordingly, the
packet domain connection.
Quectel
Confidential

Quectel UG Series Specifications

General

Brand	Quectel
Model	UG Series
Category	Control Unit
Language	English

Summary

Introduction to AT Commands

AT Command Syntax and Structure

Explains the basic, S parameter, and extended syntax of AT commands.

Safe Module Power Off Procedure

Describes the recommended procedure to safely turn off the module.

General AT Commands Reference

Requesting Device Identification

Commands to retrieve manufacturer, model, and IMEI information.

Parameter Configuration and Defaults

Commands for setting parameters to defaults and storing user profiles.

Phone Functionality and Error Reporting

Commands to set phone functionality and control error message formats.

Serial Interface Control Commands

Configuring UART Baud Rate

Command to query and set the UART baud rate.

Status Control Commands

Extended Error Report and Configuration

Commands for extended error reports and general module configuration.

SIM Card Related Commands

IMSI and SIM Card Security

Commands for requesting IMSI and managing SIM card PIN/PUK.

Generic and Restricted SIM Access

Commands for direct SIM control and restricted SIM database access.

Network Service Commands

Operator and Network Registration Status

Commands for operator selection and network registration status.

Signal Quality Reporting

Command to indicate received signal strength and channel bit error rate.

Call Related Commands

Basic Call Operations

Commands for answering, dialing, and hanging up calls.

Switching Between Data and Command Modes

Procedures for switching between data and AT command modes.

Phonebook Management Commands

Writing and Managing Phonebook Entries

Commands for writing, deleting, and reading phonebook entries.

Short Message Service (SMS) Commands

SMS Service and Message Formatting

Commands to select SMS service and set message format.

Sending and Managing SMS Messages

Commands for sending, deleting, listing, and reading SMS messages.

Packet Domain Commands

Packet Domain Attachment and PDP Context

Commands for attaching to PS service and defining PDP contexts.

PDP Context Activation and Data State

Commands to activate/deactivate PDP contexts and enter data state.

Supplementary Service Commands

Call Forwarding and Waiting Control

Commands for managing call forwarding and call waiting services.

Call Identification and Restriction

Commands for controlling calling and connected line identification.

Audio Command Reference

Volume and Audio Configuration

Commands for speaker volume, mute, and digital audio interface.

Audio Tuning and Noise Reduction

Commands for audio tuning, echo cancellation, and noise reduction.

Hardware Related Commands

Module Power Off and Clock Settings

Commands for powering off the module and managing clock sources.

Appendix and Error Summaries

Error Code Summaries

Lists CME and CMS ERROR codes and their meanings for troubleshooting.

Summary of Unsolicited Result Codes (URC)

Provides a summary of Unsolicited Result Codes (URCs) and their conditions.