In a voice gateway, the configured codec complexity of the DSPs on a voice card can be changed.
What is the impact on the DSPs if high codec complexity is configured?

A.
The codec complexity affects call density, which is the number of calls that are reconciled on the DSPs. This results in lower call density when high complexity is configured.

B.
With higher codec complexity, more calls can be processed.

C.
Lower codec complexity supports the fewest number of voice channels, provided that the lower complexity is compatible with the particular codecs that are in use.

D.
The DSP will process codecs that support high complexity transparently and shift to flex mode for those codecs that are not high complexity.

Explanation:

The difference between medium and high complexity codecs is the amount of CPU utilization necessary to process the codec algorithm, and therefore, the number of voice channels that can be supported by a single DSP. For this reason, all the medium complexity codecs can also be run in high complexity mode, but fewer (usually half) of the channels are available per DSP.

http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00800b6710.shtml#code_ com