Part 4 – AT Commands for the SocketModem iCell, SocketModem IP, and MultiModem iCell

Chapter 14

#CALLBACKTIMER – Set Automatic Call-Back Wait

Description: This parameter defines the number of seconds the TCP/IP stack will wait before an automatic call-back operation occurs after receiving an incoming call. It applies only when the ANSWERMODE parameter is set to an automatic call-back mode (value>1). This timer starts at the end of the ringing signal.

Syntax: AT#CALLBACKTIMER=<value>

AT#CALLBACKTIMER? Read or display the current setting (or AT#VPHY, AT#VALL).

Values: Integer between 2 and 255 inclusive. This timer is set in seconds.

Default: 2

#CALLSCREENNUM – Set Caller ID Service

Description:

When receiving an incoming call, the caller identification (Caller ID) service allows the TCP/IP

 

stack to identify the phone number of the remote caller. This information is helpful in preventing

 

unauthorized callers to trigger actions on the TCP/IP stack.

 

This parameter allows the user to filter the incoming calls when the ANSWERMODE parameter is

 

set to an automatic mode (value>0). This filtering doesn’t apply when the ANSWERMODE

 

parameter is set to 0. In this case, it is the host’s responsibility to accept or reject the incoming

 

call. If an incoming phone number is not authorized, the TCP/IP stack will ignore it.

Syntax:

AT#CALLSCREENNUM=<value>

 

AT#CALLSCREENNUM? Read or display the current setting (or AT#VPHY, AT#VALL).

Values:

0 - Zero. Remote caller not authorized.

 

* - All. No filtering is applied on incoming calls. All remote phone numbers are authorized. This

 

value must be set to receive incoming calls when Caller ID service is not available.

 

Not valid for Analog Devices.

 

Decimal Phone Number. Only the phone number configured here is authorized for incoming

 

calls. Alphanumeric ASCII text string up to 64 characters.

Default:

0

#KEEPALIVEMODE – Keep-Alive Mode

Description:

If the keep-alive mode is not equal to zero, then the keep-alive function will trigger. The function

 

allows a persistent physical connection to be established. If enabled and a remote host is not

 

reached, the physical connection is disconnected (if connected) and reestablished.

Syntax:

AT#KEEPALIVEMODE=<Keepalivemode value>

 

AT#KEEPALIVEMODE? Read or display the current setting (or AT#VKEEPALIVE or AT#VALL).

Values:

0

- Keep-Alive mode is disabled

 

1

- Keep-Alive mode is enabled using a TCP connection

 

2

- Keep-Alive mode is enabled using ICMP

Default:

0

 

Example:

AT#KEEPALIVEMODE=1

Universal IP AT Commands Reference Guide (Document S000457K)

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Multi-Tech Systems iCell GPRS (MTSMC-G2-IP #CALLBACKTIMER Set Automatic Call-Back Wait, #KEEPALIVEMODE Keep-Alive Mode
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iCell GPRS (MTSMC-G2-IP specifications

Multi-Tech Systems iCell GPRS (MTSMC-G2-IP) is a versatile and powerful device designed for seamless connectivity in various applications, particularly in industrial and commercial environments. Known for its robust performance, the iCell GPRS module incorporates advanced technologies that enable effective communication over GPRS networks, making it an ideal solution for IoT applications, remote monitoring, and data collection processes.

One of the main features of the iCell GPRS is its dual SIM capability, which enhances network reliability and ensures continuous connectivity even in the event of network outages. By allowing the use of two SIM cards from different carriers, the device can switch between networks automatically, thereby minimizing downtime and maintaining critical communication channels.

The iCell GPRS supports various protocols including TCP/IP, UDP, and MQTT, which facilitates seamless integration with a range of applications. This flexibility in communication protocols allows developers to create customized solutions tailored to their specific needs, ensuring that the device can fit seamlessly into their existing infrastructure.

Another key characteristic of the MTSMC-G2-IP is its compact design and durability, making it suitable for deployment in a variety of environments. It features a wide operating temperature range that allows it to function efficiently in both extreme heat and cold, thereby catering to diverse applications across different industries. Additionally, the device is designed for easy installation and integration, which helps reduce deployment time and costs.

The iCell GPRS also includes built-in security features such as firewalls and secure data transmission protocols, protecting sensitive information from unauthorized access. This is particularly important for applications in sectors such as healthcare, finance, and transportation, where data integrity and security are paramount.

Furthermore, the device is equipped with various I/O ports that facilitate connectivity with external sensors, actuators, and other hardware. This feature makes it highly adaptable for monitoring and control systems, enabling users to gather real-time data and respond promptly to changing conditions.

In sum, the Multi-Tech Systems iCell GPRS (MTSMC-G2-IP) is a reliable and feature-rich solution designed for modern communication needs. Its dual SIM support, protocol versatility, robust design, and integrated security features make it an ideal choice for IoT and remote monitoring applications across numerous industries. Whether used in industrial automation, environmental monitoring, or smart cities, the iCell GPRS stands out as a dependable device that enhances connectivity and operational efficiency.
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