Solution: There is no workaround for these limitations at this time. The only exception is if the session is initiated by an external Internet client that is not behind a NAT device. ISA Server does not have a SIP application filter at this time to handle such traffic. Instant text messaging from an internal client to an external client can go out through Web proxy.Īudio, video, and whiteboard features use SIP/SIMPLE. This avoids NAT issues that arise when an external client needs the IP address of the internal client. Presence and instant message is essentially a client/server application, where the server mediates the communication between the two clients. Problem: Not all Live Communications Server functionality works through ISA Server 2004.Ĭommunication between two clients on the same side of the ISA Server computer should work in a simple internal network configuration. Live Communications Server Has Limited Functionality through ISA Server Relevant part of the article quoted below Live Communications Server used SIP and it became a problem. Troubleshooting Unsupported Configurations The article was for ISA2004 but it continued to be a problem all the way to TMG2010. SIP being the example here, but was true for any complex protocol that carries connection information inside the payload where the NAT process is left "unaware" of it and hence cannot manage the connection properly. This is a link to the material using ISA Server as an example to show the issue with complex protocols. People from the product team back then even admit to that to us (the MVPs), but never changed the documentation or the wording in the GUI. Even MS does in the ISA/TMG product when they refer to Application Layer Filters which are actually Application Layer "proxys". Various other trademarks are held by their respective owners.I am saying that Watchguard does that in how they use terminology in their documentation. WatchGuard and the WatchGuard logo are registered trademarks or trademarks of WatchGuard Technologies in the United States and other countries. If you do not want to log connections made by a user with an access level exception, clear the Log check box adjacent to the exception. To delete an exception, select it in the list and click Remove.Ĭonnections made by users who have an access level exception are logged by default. These settings apply only to SIP VoIP traffic. You can select whether to allow users to Start calls only, Receive calls only, Start and receive calls, or give them No VoIP access. įrom the Access Level drop-down list, select an access level and click Add. This is usually a SIP address in the format such as. To create an exception to the default settings you specified, type the Address of Record (the address that shows up in the TO and FROM headers of the packet) for the exception. To create a log message for each SIP VoIP connection that is started or received, select the adjacent Log check box. To allow all VoIP users to receive calls by default, select the Receive VoIP calls check box. To allow all VoIP users to start calls by default, select the Start VoIP calls check box. When enabled, the SIP-ALG allows or restricts calls based on the options you set. To enable the access control feature, select this check box. SIP-ALG Action access control configuration in Policy Manager SIP-ALG Action access control configuration in Fireware Web UI In the SIP-ALG Action Access Control configuration, you can create a list of users who are allowed to send VoIP network traffic.
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