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At the moment there is no way to add the destination number of the message to the event description. But it is a good idea and I will add it to the list of new features for the next version of Diafaan SMS Server.

Regards, Henk

Diafaan SMS Server tries to re-send failed messages two times by default, but you can increase the maximum number of send-attempts in the 'Gateways' settings of each connector. A message send error means that one attempt to send the message failed but if there are no errors in the send log, one of the next send attempts for the message was successful.

I don't think that it is possible to change the operator code on the SIM card, at least not by you, but your network operator might be willing to exchange the SIM card for new ones with the most recent home network code.

There is not much that you can do in Diafaan SMS Server to solve the roaming problem or the CMS errors, the modem automatically logs on to the best network that is allowed by the SIM card. It is possible to force the modem to log on to a specific network if you know the operator code of the network. I don't think it will have much effect on the number of CMS errors but maybe it is worth a try. For instance, to force the modem to use network code '12345', you can set the 'ModemInitializationBeginning' property in the advanced settings of the GSM Modem Gateway to 'AT+COPS=1,2,"12345"'.

Another measure that sometimes works to prevent CMS errors is to slow down the send speed, you can try to set the 'SendDelayTime' in the advanced settings of the GSM Modem Gateway to 1 or 2 seconds and see how that affects the number of send errors.

Regards, Henk

Hello Allan,

It is not certain that CMS ERROR 513 and the roaming problem are related but it is not unlikely either. The alert in the event log of Diafaan SMS Server is a warning that the modem is not able to log on to the home network of the SIM card and uses an alternative network instead. In itself this does not have to be a problem, it is just a warning to remind you of a situation that might be undesirable when roaming is more expensive.

There can be a couple of reasons why your modem is roaming. Perhaps the network strength of your home network is too low in the location of the modem. In that case it might help to move your modems to another location or use better antenna's.

It is also possible that the modem modules are not fully compatible with your home network, the Q2403A modules use a pretty old GSM chipset that sometimes has a problem with modern mobile networks. The Q24Plus modules that are often an option for GSM modem pools are more expensive but they are of a newer design and seem to have fewer compatibility problems.

Another problem could be that your network does not have 2G coverage in your area anymore. In some countries, the 2G network is slowly being dismantled and replaced by 3G and 4G cells. If that is the case then the only option might be to use 3G modems. This could also explain why you do not see roaming on a 3G phone.

Regards, Henk