The following environment variables affect the behaviour of libvpb.
Sets the region to use for global default values. Its value may be either a string, indicating the name of the region such as
AUSTRALIA
,
JAPAN
,
UK
,
USA
, or the numerical value of that region used for international phone numbering, such as 61, 81, 44, 1, respective to the names above. If not specified, the default value is
AUSTRALIA
. Per port country selection may be made programmatically using the
vpb_set_country()
api call, or through the use of a
configuration file.
Sets new default parameters for use by the programmable
tone detector. The variables
VPB_TONE1
...
VPB_TONE9
may also be specified if more than one tone is to be redefined.
If set to the value of
1
, this variable will cause libvpb to output debugging messages tracing its activity to
stdout
. If set to any other value it will be used as the path to a file where such messages will be written.
If set to the string
"V4LOG"
, this variable indicates that
OpenLog cards should be assumed if the
OpenLine card type has not otherwise been explicitly specified. Has no effect with cards of other types.