The Alternate Routing Extension field is available on the IP Network Region screen. Each network region uses this field, which is up to 7 digits long, to route the bearer portion of the IGAR call.

If IGAR is enabled for any row on pages 3 through 19, then the user must enter an IGAR extension before submitting the screen. Also, the user is blocked from blanking out a previously administered IGAR extension. If IGAR is disabled by the System Parameter, the customer is warned when any of these fields are updated.