Required Functions
Gatekeepers are required to perform all of the following functions. Since endpoints
are required to use a gatekeeper if one is available, this is an excellent
control point for the network:
Voice and Video Gatekeeper Design • Chapter 5 133
134 Chapter 5 • Voice and Video Gatekeeper Design
Address translation Also known as address resolution, the gatekeeper
will translate an H.323 address (such as an E.164 phone number) into an
IP address.The gatekeeper will do this by resolving the phone number
to an endpoint already registered with the gatekeeper or by finding the
location of the phone number by querying other configured gatekeepers
using the H.225 (RAS) protocol. For example, the gatekeeper can translate
212-555-1212 into 10.15.6.1.The gatekeeper can also translate
based upon H.323 IDs (character strings).