Opens the ports necessary to make and receive calls, and to exchange audio and video media.You do not have to complete any additional configuration steps to use IM with the SIP-ALG.
The SIP-ALG supports page-based instant messaging (IM) as part of the default SIP protocol. This can help you to troubleshoot any problems. We recommend you make sure that VoIP connections work successfully before you add an H.323 or SIP-ALG. It can be difficult to coordinate the many components of a VoIP installation. It can support both the SIP Registrar and the SIP Proxy when used with a call management system that is external to the Firebox. The WatchGuard SIP-ALG supports SIP trunks. The WatchGuard SIP-ALG opens and closes the ports necessary for SIP to operate. Together, these components manage connections hosted by the call management system. In the SIP standard, two key components of call management are the SIP Registrar and the SIP Proxy. The call management system can be self-hosted, or hosted by a third-party service provider. 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 with either: For instructions to add the SIP-ALG to your Firebox configuration, see Add a Proxy Policy to Your Configuration.įor supported deployment configurations, see Example VoIP Network Diagrams. Before you configure SIP-ALG, you must create a proxy policy to handle the traffic. There is no default policy for SIP-ALG traffic. To determine which ALG you need 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 behind the 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 a SIP (Session Initiation Protocol) or H.323 ALG (Application Layer Gateway) to open the ports necessary to enable VoIP through your Firebox.
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