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If you are willing to test out the fix for Kannel, I can send you a plugin for the SMPP Connector. We already implemented the solution in the code for the next version of Diafaan SMS Server but have not yet tested it out completely.

Regards, Henk

I have set up a test installation to see how Kannel handles the DLRs from Diafaan SMS Server and confirmed that the SMPP Connector in Diafaan SMS Server 4.1.0.0 does not send DLRs back to Kannel for multi-part messages.

It turns out that Kannel only requests a DLR for the first part of a multi-part SMS message and Diafaan SMS Server looks at the last part of the multi-part message to determine if it should send back a DLR for all the message parts.

In the next version of Diafaan SMS Server we will change the way that the SMPP Connector determines which message parts should trigger a DLR so that Diafaan SMS Server only sends back the DLR for the messages parts with a DLR request and not for the message parts without a DLR request.

Regards, Henk

Hello Dmitry,

I think this problem occurs because SMPP Connector in Diafaan SMS Server 4.1.0.0 (and earlier) does not use the optional TLV parameters to specify the delivery status information to the SMPP client, it only uses the receipt text. Apparently, Kannel only processes the receipt text when it is sent in a deliver_sm message and when it is sent in a data_sm packet it expects the status information to be available in a TLV.

We had a similar report from another user and in the next version of Diafaan SMS Server we will add status TLVs in the receipts when the 'MessageInHandling' is set to 'Deliver_SM_UsePayloadTlv' or 'Data_SM'.

Regards, Henk