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The list of alphabet codes are specified in the SMPP specification v3.4, section 5.2.19.  One notable limitation of the SMPP specification is that there is no alphabet code for explicitly requesting use of the GSM 3.38 (7 bit) character set.  Choosing the value 0 for the alphabet selects the SMSC default alphabet, this usually means GSM 3.38 but it is not guaranteed.  The SMPP gateway Nexmo actually allows the default to be mapped to any other character set with a control panel option. It is suggested that users check with their SMSC operator to confirm exactly which character set is being used as the default.

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