This is an error generated by the GSM modem, it could be a bug in the firmware of the modem. What 3G/GSM modem do you use currently?
If you send the communication log of the modem to dms at diafaan dot com I will have a look at it. (See http://www.diafaan.com/how-to/log-modem-problems/ on how to create a communication log)
When I send more than 145chars on an sms, the server submit an error 500 Unknown Error.
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