Thanks Josh. "Real-Time Communication (RTC) client communications may not work if the client is located behind a Network Address Translation (NAT) device. The hotfix that is described in this article enables NAT-aware programs to configure the RTC API to use the correct address and port when it sets up the audio or video streams. After you install this hotfix, clients that are located behind the NAT device can use audio and video communications with other clients or gateways that are located outside the NAT device. Note that this hotfix does not help clients that are located behind a NAT device to connect to the Session Initiation Protocol (SIP) server. This hotfix does not enable Microsoft Windows Messenger clients that are located behind a NAT device to use audio and video with each other. However, the hotfix does enable Windows Messenger clients that are located behind a NAT device to communicate with phone gateways. "
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