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    One-Way Audio

    This is when caller A can hear caller B, but caller B cannot hear caller A.

    The usual culprit for one-way audio relates to IP routing. Remember, not all packets take the same path to the destination. Packets A, D, and E might go across an OC-3 link that has no compression or any type of security functionality, whereas packets B and C go over a T1 line used by everyone. The T1 line uses header compression, access lists, and firewalls on both ends.


      

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