Technical Configuration (Analog/BRI) MultiVOIP User Guide
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Note that Interface parameters are applied on a channel-by-channel
basis. However, once you have established a set of Interface
parameters for a particular channel, you can apply this entire set of
Voice/FAX parameters to another channel by using the Copy Channel
button and its dialog box. To copy a set of Interface parameters to all
channels, select “Copy to All” and click Copy.