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Hello Tony,

Receipts, or delivery reports, are enabled by default in Diafaan SMS Server. There can be two reasons for missing receipts, the most obvious reason is that the receipts are simply not received by Diafaan SMS Server. Some mobile operators don't send receipts back or they skip some of the receipts when there is a lot of SMS traffic.

Another reason could be that the format of the phone number in the SMS message differs from the format of the phone number in the receipt, for instance the number in the message uses national number format and the receipt uses international number format. If that is the case, Diafaan SMS Server won't be able to match the receipt to the original message. It is usually best to use only numbers in international number format (starting with a '+' and country code) when you send a message with Diafaan SMS Server. Diafaan SMS Server has an option to change the number format in the connectors before sending the messages.

Regards, Henk