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When a Codec sends out a video frame, it initially will transmit frames described as I frames (reference frames). The I Frame contains the complete information needed to display a picture. To save on bandwidth, instead of continuously transmitting the I frames, a technique is used where the subsequent video packets sent after the I Frame are just updates to the initial picture. These updates which are labeled P Frames are sent to minimize the amount of video data that needs to be transmitted from one video system to another. Occasionally the P Frames become corrupted through different issues such as packet loss, jitter, or there is too much information. At this point the far end would request a Video Fast Update request. The VFU requests a new I Frame be sent with the full reference frame of video information. Once the new I-Frame is sent, the subsequent packets sent will be P-Frames starting with the new I Frame just sent. The VFU feature is always running on the IMG 2020 and cannot be disabled.
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The SIP VFU object is created under the SIP Profile object. The SIP Profile object that has the VFU object configured under it can be selected from the drop down menu of the SIP Profile field in the External Gateway object.
Field Descriptions
VFU Delay (Default= 0 seconds)
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