Appendix - GSM Modem Error Codes

Ozeki SMS Gateway allows you to send SMS messages through a GSM Modem. If a message send attempt fails through a GSM modem, a log entry, containing one of the following error codes is displayed. This document provides the meaning of the error codes.

What is GSM modem error code

GSM modem error codes are a set of numeric codes that are used to indicate the cause of an error when sending or receiving an SMS message. The codes are used by GSM devices (IoT device that use a GSM modem), such as mobile phones and SMS gateways, to communicate with each other and to provide troubleshooting information to users.

GSM error codes are divided into two categories:

• CMS error codes are used to indicate network-related errors. These errors can occur for a variety of reasons, such as the destination phone being turned off, the network being congested, or the message being too long.
• CME error codes are used to indicate device-related errors. These errors can occur if the device is not properly configured, if the SIM card is not inserted correctly, or if there is a hardware problem with the device.

GSM error codes are typically displayed as a text message that begins with the word "ERROR" followed by the error code. For example, an error code of "300" would indicate a "ME failure" error, which means that the device was unable to process the message.

GSM error codes can be helpful in troubleshooting problems with SMS messaging. If you receive an error code, you can consult a GSM error code chart to determine the cause of the error and take steps to correct it.

Here are the main GSM error codes:

CMS Error Codes

• 200: Message sent successfully
• 300: ME failure
• 400: Network failure
• 500: Unspecified error

CME Error Codes

• 200: Command executed successfully
• 300: Command not supported
• 400: Invalid parameter
• 500: Operation not allowed

You can find a complete list of GSM error codes in the following table: