3.2.2.1 Set Environment Variable CALLID_FIELDS_CFG
Set CALLID_FIELDS_CFG to enable this support. If it is not set, this support
will not be enabled. CALLID_FIELDS_CFG also specifies the configuration file
location and field names. Both absolute file path and relative file path are supported.
export CALLID_FIELDS_CFG=/APPDIR/callid.iniParent topic: Configurations for Customized Call ID Support