![]() 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". This is particularly important in connection with any issues which may impact on your network security or local IT policies.I am saying that Watchguard does that in how they use terminology in their documentation. It is recommended that your firewall maintainer, switch maintainer or IT consultant is consulted on all matters relating to your communications network including, but not limited to, PBX configuration, LAN and firewall configuration. ![]() The information in this document is provided for general guidance only. equipment which that is not part of BT's network and which is owned or controlled by the customer) then BT may apply a charge. If faults are reported to BT which are found to be caused by customer equipment (i.e. If this is not implemented correctly then this may result in a degraded service. In order to maintain the quality it is essential that the internal network components suitably support the service for delivery of your voice calls. ![]() Your BT SIP Trunks service together with a correctly dimensioned BTnet access service has been designed to appropriately support a quality voice service alongside the use of data. If your router and/or firewall are "SIP Aware" / has a SIP ALG enabled, then this functionality must be turned OFF so that the device does not interfere with any signalling. making and receiving incoming or outgoing call.If SIP ALG is activated, it can stop your SIP trunks from: How can it affect SIP calls and registration? Routers will often have SIP ALG activated by default. It inspects any VoIP traffic to prevent problems caused by firewalls and if necessary modifies the VoIP packets. SIP (Session Initiation Protocol) ALG (Application Layer Gateway) is an application within many routers.
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