This error is an indication that your GSM modem returns an error when Diafaan SMS Server tries to send an SMS message. The error code that was returned from the modem is manufacturer specific and it is therefore difficult to determine what the exact cause of the error is. Possible reasons for the error are an invalid destination number, an invalid SMSC number or connection problems between the GSM modem and the GSM network.
If your license for Diafaan SMS Server is still in the free upgrade and support period, you can send the communication log of the GSM Modem Gateway to firstname.lastname@example.org and I will have a look to see if I can find something wrong in the log. Please include the serial number or purchase order number of your license in the email.
I am getting this error using diafaan sms gateway.
300, Error: Unknown error after PDU sent.
Please give me a solution to this errror.
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