1. H.323 gatekeeper H.323 gatekeeper controls all H.323 clients (endpoints like MS Netmeeting) in your zone. Its most important function is address translation between symbolic alias addresses and IP addresses. This allows you to call "jan" instead of knowing which IP address he currently works on. To utilise the gatekeeper you require a H.323 client, such as simph323, ohphone or even MS Netmeeting. - can send LRQ to neighbour GK based on prefix - authentication mechanism - Alternate gatekeeper option - rewriting of E.164 numbers - "ping" endpoints (heartbeat) - TCP interface for monitoring and controlling the GK From Debian 3.0r0 APT