End users report bad video quality and voice choppiness on Cisco Collaboration endpoints. The engineer changed the device pool the users were in but did not correct the problem. Which action should be taken to troubleshoot this issue?
A.
Restart the Cisco Location Bandwidth Manager service on the Cisco UCM publisher
B.
Check for duplex/speed mismatches between the network port settings of the system and network switch
C.
Use direct IP address calls between two endpoints to troubleshoot call quality issues
D.
Set the service parameter Use Video Bandwidth Pool for Immersive Video Calls to ג€falseג€
question says : "ENDPOINTS" - plural - which means there is more of them and we should than check D ... if there was 1 users we''ll be checking network port settings.
Another tricky question, in real production, you won't go and change service parameteres for single user, first you go and check the the device network port, correct. And again in real life when you get duplex/speed mismatch you are getting bigger problem than voice/video quality, the phone may got disconnected, and you get dial tone with delay and few more signaling issue. And for such things, the issue only is not affected one user and could be reported with many users. So, if the issue is not the network port, then you go and disable "Video Bandwidth Pool for Immersive Video Calls", and test it again.
I say answer is B. Bandwidth control in CUCM is about limiting bandwidth usage and whether to allow calls to set up.
This question discusses poor call quality suggesting poor packet throughput. So more network related, therefore answer is B.
I'm not sure if that's true. This is the description of the service parameter taken from a v12.5 CUCM - This parameter specifies whether Cisco Unified Communications Manager reserves bandwidth from desktop video bandwidth pool for immersive video calls. When this service parameter is set to True, Unified CM will use the value from 'Maximum Session Bit Rate for Video Calls' in the Region Configuration window. When this service parameter is set to False, Unified CM will use the value from 'Maximum Session Bit Rate for Immersive Video Calls' in the Region Configuration window for Immersive to Immersive call.
Therefore, by setting it to False you are allowing CUCM to reserve bandwith from the Immersive video call bandwith pool (used for Location CAC) and therefore potentially oversubscibing your network bandwith, ie you are allowing more high bandwidth Telepresence video calls to be allowed on the network. This looks like a network related issue to me, ie Answer B - duplex/collision sort of thing causing packet drops?
The max session bit rate per call would be taken from the setting in the video devices Region config
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