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Each VoIP Bearer port can have up to seven individual Codecs configured under it. The Vocoder Profile object pane gives a user the ability to specify a codec or payload type such as G.711 ulaw etc. Maximum, Minimum, and Preferred payload types can also be modified through the drop down menu. Once created under the IP Profile object, the IMG 2020 IP signaling stacks will negotiate their use in the order in which they appear in the under the IP Profile object in the Web GUI. The priority with which the codecs are selected and utilized is determined by what position in the Web GUI tree the codec is positioned. If the codec is positioned at the top of the IP Profile codec list, it gets highest priority and the priority gets lower as the codec is positioned lower down the list. However, the priority of the codec can be changed by clicking on the codec icon in the configuration tree and dragging the codec up or down the IP Profile list of codecs. If a blue bar appears while moving the object, that indicates the object can be moved to that location. If a red circle with a line though it appears while moving the object, that indicates the object cannot be moved to that location. The screen capture just below displays a red circle with a line through it indicating the object could not be moved to that specific location in the Web GUI configuration tree.
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