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98 errors out of 260 sent messages is a lot more than I usually see with Siemens or Cinterion modems. Hopefully the send delay will decrease the number of errors to a more normal value. A high number of errors usually points to a problem with the connection to the mobile network, sometimes a better antenna or another placement of the modem can help to improve the reliability of the modems.

The reliability of the Wavecom modem modules is more or less the same as the reliability of the Conterion/Siemens modules. However, sometimes a specific modem module works better on a specific network than other modem modules.

Regards, Henk

Hello Allan,

Are you sure that the error 'CMS ERROR: 500' is returned after each message? If that would be the case, and you still receive the messages, I would expect that you receive each message multiple times because Diafaan SMS Server re-sends the message when this error occurs.

It is not unusual that the error 'CMS ERROR: 500' is returned once in a while but when this does not happen too much it is not a problem. The Siemens and Cinterion modems seem to generate more send error messages than some other modem brands but not so much that it would normally cause problems.

You can see the number of message errors on the status page of the GSM Modem Gateway. The 'Message send errors' indicate the number of errors after attempting to send the messages and the 'Messages sent' indicates the number of messages that are successfully sent. The number of send errors should be low in comparison with the number of sent messages. If it is too high then it indicates that there are connection problems between the modem and the network.

To decrease the number of send errors, you can slow down the send speed with the 'SendDelayTime' property in the advanced settings of the GSM Modem Gateway. If you set this property to 1 or 2 seconds you should see a decrease in the number of send errors.

Regards, Henk