NAT/FW settings must have a APPREF parameter that defines a string that is referred by the TO-APPREF parameter:
<parm name="APPREF" value="Example_NAT_FW_settings"/>
Reference to SIP settings:
<parm name="DOMAIN" value="example.com"/>
Domain links the NAT/FW settings to SIP settings. Domain here must be the same as the domain in Public User ID (PUID) of the SIP settings.
References to access points:
<parm name="TO-NAPID" value="INTERNET"/>
TO-NAPID must refer to a specific NAP using the value of the NAPID defined the same provisioning document or it can refer to "INTERNET" when any network access point can be selected with the attribute INTERNET defined.