QuestionQ1

Infrastructure and Design

Cisco UCM uses location-based call admission control to control the bandwidth permitted between predefined locations. What must be taken into account when calculating how many calls can be placed?

  • A A limit of 900 kb is the total amount of bandwidth used for the sum of the media and signaling in the calls. The system allows for an actual of 20% overhead of IP packet headers. This is to compare the use of ISDN lines with no IP overhead.
  • B A limit of 900 kb Is the total amount of bandwidth used for the sum of calls of the defined codec including headers and media traffic.
  • C A limit of 900 kb is the total amount of bandwidth used for the sum of calls. The use of compression does not impact the amount of calls because only the codec definition is considered when calculating the CAC in Cisco UCM.
  • D A limit of 900 kb is the total amount of actual used RTP traffic so the oversubscription can be done for multiple calls adding Its maximum RTP stream requirements.
Explanation

Cisco UCM location-based CAC tracks the bandwidth consumed by active calls according to the selected codec. For audio calls, its bandwidth calculation includes the media bit rate plus IP/UDP header overhead, so the configured location bandwidth is allocated against the aggregate calculated call bandwidth rather than signaling traffic or RTP payload alone.

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