Cisco Cisco MediaSense Release 8.5(2) Guía De Diseño

Proportion (M) of recorded session hours which are converted to .mp4 and retained

.mp4 average bit rate (K) in MB/hour

o Write Rate (W) = (B * P * U) * (1 + K * M)

If Call Admission Control (CAC) is enabled, Unified CM automatically estimates whether there is enough available bandwidth between the
forking device and the recording server so that media quality for either the current recording or for any other media channel along that path is
not impacted. If sufficient bandwidth does not appear to be available, then Unified CM will not record the call; however the call itself does not
get dropped. There is also no alarm raised in this scenario. The only way to determine why a call did not get recorded in this situation is to
examine its logs and CDR records.

It is important to provision enough bandwidth so that this does not happen. In calculating the requirements, the Unified CM administrator
should include enough bandwidth for 

, even though the reverse direction of each stream is not actually being

used.

Bandwidth requirements also depend on the codecs in use, and in the case of video, on the frame rate, resolution and dimensions of the
image.