enum MtasShIfEffMandBitSettingDT

Numeric Enumeration: 0-1 (0=MBIT_SET_STANDARD, 1=MBIT_SET_INFORMATIVE)

References from:
MtasShIf;

0
MBIT_SET_STANDARD
In standard mode the M bit is set in all Sh request messages (not set in Sh answer messages).
1
MBIT_SET_INFORMATIVE
In informative mode the M bit is set in only those Sh request messages that contain multiple ServiceIndications (not set in Sh answer messages).
  enum MtasShIfEffMandBitSettingDT