GNU Gatekeeper 2.2.6

The GNU Gatekeeper (GnuGk) is a full featured H.323 gatekeeper that forms the basis for a free IP telephony system (VOIP).
The GNU Gatekeeper (GnuGk) is a full featured H.323 gatekeeper that forms the basis for a free IP telephony system (VOIP).

The GNU Gatekeeper is very stable. It is being used commercially by many organizations to provide VOIP services.

What is a H.323 gatekeeper ?
A H.323 gatekeeper controls all H.323 clients (endpoints like MS Netmeeting) in his zone. Its most important function is address translation between symbolic alias addresses and IP addresses. This way you can call "jan" instead of knowing which IP address he currently works on.

Why should I use a gatekeeper ?
If you currently use a client and are happy with the way it works there may be no reason to use a gatekeeper. If you however work in a larger VoIP setup using symbolic addresses is definitely a great plus. More importantly the gatekeeper is the key to the management of a VoIP network.

VoIP gateways for example register at the gatekeeper and the gatekeeper finds the right one for you to use to call a specific number.

A gatekeeper can also manage the bandwidth used by the clients. Currently we grant all bandwidth requests until a predefined limit is reached. In the future we could implement a more detailed schema.

Main features of GNU Gatekeeper:

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Accounting and call authorization via SQL database, Radius, file or external application
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Flexible call routing
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Number rewriting (calling and called)
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Support for NAT traversal
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Full H.323 proxy
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TCP interface to applications
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CTI functions (eg. VOIP call-center, call transfers)
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Gatekeeper clustering support (neighbors, parent/child, alternates)
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H.235 security
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Graphical user interface
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It's free, including source code