Another possibility is that the number base of the msg-id does not match with the SMSC. Do you maybe have connecion to more than one SMSC, either explicitelly or behind the virtual IP of the smsc? Check the manual:

msg-id-type number Optional, specifies which number base the SMSC is using for the message ID numbers in the corresponding submit_sm_resp and deliver_sm PDUs. This is required to make delivery reports (DLR) work on SMSC that behave differently. The number is a combined set of bit 1 and bit 2 that indicate as follows: bit 1: type for submit_sm_resp, bit 2: type for deliver_sm. If the bit is set then the value is in hex otherwise in decimal number base. Which means the following combinations are possible and valid: 0x00 deliver_sm decimal, submit_sm_resp decimal; 0x01 deliver_sm decimal, submit_sm_resp hex; 0x02 deliver_sm hex, submit_sm_resp decimal; 0x03 deliver_sm hex, submit_sm_resp hex. In accordance to the SMPP v3.4 specs the default will be a C string literal if no of the above values is explicitly indicated using the config directive.


On Feb 18, 2020, at 06:13, Robin C <robi...@refined.co.in> wrote:

Hi,

The same is happening to me also. Sometimes I am not receiving the DLR of delivered messages also. If i sent 1000  messages i might get 900 DLRs. What might be the reason.

On Mon, Feb 17, 2020 at 3:57 PM Tolga Ulas <tolga.u...@tolgaulas.com> wrote:
Also check your smpp logs (raise it to debug level in your config) and
check if kannel can successfully create outgoing dlr records and can
match them with incoming dlrs during transactions. If all goes well
you will see no warning or error for all messages

> - Maybe you have messages that are pending and they have different status. - Try with a simple mask (3) and then set a short expiration of the messages that you are going to test. Have one test phones on, one that you will turn on before expiration and a third one that you don’t turn-on before the expiration. Record all the dlrs that the SMSC will send and try to figure out the logic. Increase the dlr-mask and check the other scenarios - check with the SMSC operator if they send back an SLR if the message is expired or deleted from the SMSC DB for whatever reason. Regards, Davor



--
 Thanks & Regards,
    






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