Polycom QDX 6000 Release Notes page 10

Release Notes
Polycom® QDX 6000™, Version 4.0.1.1
Interoperability
Polycom QDX 6000 systems are tested extensively with a wide range of
products. The following list is not a complete inventory of compatible
equipment; it simply indicates the products that have been tested for
compatibility with the 4.0.1.1 release.
Video conferencing systems use a variety of algorithms to compress audio and
video. In a call between two systems, each end transmits audio and video using
algorithms supported by the other end. In some cases, a system may transmit a
different algorithm than it receives. This process occurs because each system
independently selects the optimum algorithms for a particular call, and different
products may make different selections. This process should not affect the
quality of the call.
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