enum mtasSipTransparentEarlyByeDT

0=TRANSPARENT_EARLYBYE_DISABLED. EARLY BYE is immediately answered with 200OK and CANCEL is sent .1=TRANSPARENT_EARLYBYE_ENABLED.SIP SFW will be sent transparently.

References from:
MtasSip;

0
TRANSPARENT_EARLYBYE_DISABLED
EARLY BYE is immediately answered with 200OK and CANCEL is sent
1
TRANSPARENT_EARLYBYE_ENABLED
SIP SFW will be sent transparently