Panasonic KX-TDA0490 Programming Manual page 36

2.2 Programming
Parameter & Description
* Group No.
Specifies the number of the gateway group to which the
gateway entry belongs.
Grouping is useful when there is more than one card installed
in a PBX, because it allows you to use the automatic route
redirection feature. For details, refer to "Detailed
Explanations" in the next section, "2.2.7 Address Translation
Table—DN2IP Entry".
36 Programming Guide
Default Value Range
0 0 (belong to no group),
1 to 256