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commit a95ee5e6e192d274d5d2c03fbe47edbc62c38beb Author: Neels Hofmeyr nhofmeyr@sysmocom.de Date: Mon Oct 10 22:46:20 2016 +0200

fix USSD: SS message type mask should be 0x3f, not 0xbf

See 04.80[1], section 3.4: the highest two bits are used as counter or ignored and do not contribute to the SS "Miscellaneous message group". Previous mask of 0xbf included the highest bit, fix to 0x3f.

Observed a value of 0xbb that should mean 0x3b="Register" during testing of 3G USSD requests, which seem to be the first to send a nonzero highest bit to our code. The erratic mask of 0xbf lead to an unhandled message type of 0xbb.

[1] 3GPP TS 24.080 version 7.2.0 Release 7 / ETSI TS 124 080 V7.2.0 (2006-09)

Change-Id: I299001a9e36c16f55622a0acd5d4a55ca49d0055

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Summary of changes: src/gsm/gsm0480.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

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