enum MtasSipTransparentTelContactDT

Numeric Enumeration: 0-1 (0=TRANSPARENT_RELAY_DISABLED, 1=TRANSPARENT_RELAY_ENABLED)

References from:
MtasSip;

0
TRANSPARENT_RELAY_DISABLED
Transparent relay of a telephone number in the received Contact header is disabled.
1
TRANSPARENT_RELAY_ENABLED
Transparent relay of a telephone number in the received Contact header is enabled.
  enum MtasSipTransparentTelContactDT