The Alternate Gateway List (AGL) is created using an entry from DHCP, a TFTP script, DNS server, or manually by administration on the IP endpoint. It can contain the IP addresses of up to thirty (30) eligible Gateways that the IP endpoint can register with. In addition, there are three (3) parameters associated with the use of the Alternate Gateway List.

AGL changes made within Communication Manager administration are downloaded to the IP endpoint during the registration process and as soon as possible after any administration is performed.