Update: The problem was caused by two installations of Diafaan SMS Server using the same MessageOut table of the SQL database. Removing one of the installations of Diafaan SMS Server solved the problem.
I'm using Diafaan 2.1 version.
last month I changed sms device "Huawei" to "8-port TCP/IP modem pool"
It is good to manage but about 40% messages are not sent.
We had to resend it.
but in the log, there is no error text. so, I cannot find solution.
If want to see log, I can send you.
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