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|Des - NowSMS Support
Post Number: 620
From a tech support e-mail ... posted here for future searches...
This error code is in the manufacturer specific range (512+) ... and unfortunately, it is does not seem to be documented in the Multitech EDGE modem documentation.
However, in this particular case, the UDH (user data header) appears to be invalid.
The first byte of the UDH is the length of the UDH, which is fine in this case. The second byte would be the length of the first information element in the UDH ... and this value cannot exceed the overall UDH length. In this case it does, which would make it an invalid format.