[PATCH 05/12] Modify ussd parser

[Denis Kenzior]

Hi Yang,

> * Original code doesn't call unpack_7bit(), which seems not correct.
> * An utility function is used to handle it, which supports 8-bit
> and ucs2 besides 7-bit character.
> * Status is assigned with correct value when error occurs

Please drop this patch for now, the problem is that all AT modems do not 
actually report USSD data as a PDU, instead they actually decode this into the 
current character set of the modem (as set by +CSCS.)  The spec really screwed 
up on this one.

This is one of the weirder parts of the spec, I don't think USSDs that are not 
GSM 7 bit are even possible.  At least not on the AT modems I've encountered.

Feel free to investigate this further.

Regards,
-Denis