Q1Infrastructure 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?
← → navigate · a answer
Community votes
Discussion · 5
B 5
Selected Answer: B
The correct answer is B. When figuring out how many calls can be placed with location-based call admission control (CAC) in Cisco UCM, you need to account for the bandwidth consumed by the calls. The bandwidth used by a call is the total of the media traffic and signaling traffic, including any IP packet headers. The bandwidth limit is usually set as one total amount for all calls, and the number of calls that can be placed is found by dividing the total available bandwidth by the bandwidth used by each call. Therefore, option B is the correct answer
A 4
Selected Answer: A
I think it should be A here
3
A, correct?
2
The question above literally mentions the 20%, so why is this question not answered correctly.
B 2
Selected Answer: B
A. is incorrect. In the calculation, signaling is not considered.
C. is incorrect. CAC always includes overhead. For audio codecs, the overhead consists of the ip headers. In video, the overhead consists in just adding 20%. Calculation of overhead is different in audio and video, however, overhead is always considered.
D. Video codecs do not have a specific bandwidth rate assigned to them like audio codecs. You can place a video call using 480p30 resolution at 384 kbps or at 2 Mbps. However, using a higher codec can provide better efficiency and therefore use less bandwidth. For this reason, in the regions, the calls are not defined by codecs, but by per-call bandwidth.
B. Is correct. The amount of bandwidth is the sum of the calls, including the media traffic consumed based on the codec, plus the headers.
Reference: "CCNP and CCIE Collaboration Core CLCOR 350-801 Official Cert Guide"
Chapter 18: Cisco Unified Communications Manager Call Admission Control (CAC).