Setting ISP Priority for Failover
When using a modem connection, a trustee administrator can manually change an ISP priority. If a failover situation occurs, the priority assigned to an ISP indicates in what order relative to other ISPs that a particular ISP will be contacted. The lower the value, the higher the priority of the ISP. The trustee admin can also check the availability of an ISP with a priority setting of zero (0).
A root administrator (not a trustee admin) can configure up to four ISPs. The priority of each ISP must be a unique number. You can also configure more than one ISP with a priority of zero.