![]() In a peer-to-peer connection, each of the two devices knows the IP address of the other device and connects to the other directly, without the use of a proxy server to route their calls.Ĭonnections managed by a call management system (PBX). It is important to understand that you usually implement VoIP by using either: ![]() To determine which ALG to add, consult the documentation for your VoIP devices or applications. You can use both H.323 and SIP ALGs at the same time, if necessary. H.323 is commonly used on videoconferencing equipment. These ALGs have been created to work in a NAT environment to maintain security for privately addressed conferencing equipment protected by your Firebox. An ALG is created in the same way as a proxy policy and offers similar configuration options. If you use Voice-over-IP (VoIP) in your organization, you can add an H.323 or SIP (Session Initiation Protocol) ALG (Application Layer Gateway) to open the ports necessary to enable VoIP through your Firebox.
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