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Level 9

MOS score of zero

Hello,

Just wondering why I will randomly get a mos score of zero on some of my call paths, jitter, latency, and packet loss is all at zero, is like the call path was not created, but I don't get any errors or events in relation to that. Anyway I can confirm that is not been created or why is at zero?

 thanks
 

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5 Replies
Level 13

If after following Bryan's suggestion you are still unsure send your VoIPMonitorService.log files in through support and we can look and see the actual values being returned from your device via SNMP.

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 thanks.

I know you can check the probe on the router itself and I have before, the MOS score just seems to be very incosistent, sometimes it returns zero  and then it comes back with a normal value, as it is right now.

I will check the log as suggested.

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 ok I saw this on the last fail:
 

xxxxxxxxx>show ip sla mon statistics 4
Round trip time (RTT)   Index 4
        Latest RTT: NoConnection/Busy/Timeout
Latest operation start time: 17:23:24.632 EST Wed Feb 20 2008
Latest operation return code: Timeout
RTT Values
        Number Of RTT: 0
        RTT Min/Avg/Max: 0/0/0 ms
Latency one-way time milliseconds
        Number of one-way Samples: 0
        Source to Destination one way Min/Avg/Max: 0/0/0 ms
        Destination to Source one way Min/Avg/Max: 0/0/0 ms
Jitter time milliseconds
        Number of Jitter Samples: 0
        Source to Destination Jitter Min/Avg/Max: 0/0/0 ms
        Destination to Source Jitter Min/Avg/Max: 0/0/0 ms
Packet Loss Values
        Loss Source to Destination: 0           Loss Destination to Source: 0
        Out Of Sequence: 0      Tail Drop: 0    Packet Late Arrival: 0
Voice Score Values
        Calculated Planning Impairment Factor (ICPIF): 0
        Mean Opinion Score (MOS): 0
Number of successes: 11
Number of failures: 1
Operation time to live: 0

 

Issue with the router in this case? 

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Something in the chain from source to destination and back again is timing out. This can be due to the destination device flooding or being overloaded or any device between the source and destination having issues.

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Level 12

If this is a Cisco router you can verify what it is seeing in terms of the tests using 'sho ip sla mon stat' :

 

router#sho ip sla mon stat
Round trip time (RTT)   Index 1
        Latest RTT: 41 ms
Latest operation start time: 13:53:11.270 EST Wed Feb 20 2008
Latest operation return code: OK
RTT Values
        Number Of RTT: 100
        RTT Min/Avg/Max: 40/41/47 ms
Latency one-way time milliseconds
        Number of one-way Samples: 100
        Source to Destination one way Min/Avg/Max: 19/19/20 ms
        Destination to Source one way Min/Avg/Max: 21/21/27 ms
Jitter time milliseconds
        Number of Jitter Samples: 99
        Source to Destination Jitter Min/Avg/Max: 1/1/1 ms
        Destination to Source Jitter Min/Avg/Max: 1/1/6 ms
Packet Loss Values
        Loss Source to Destination: 0           Loss Destination to Source: 0
        Out Of Sequence: 0      Tail Drop: 0    Packet Late Arrival: 0
Voice Score Values
        Calculated Planning Impairment Factor (ICPIF): 11
MOS score: 4.06<----------------------------------
Number of successes: 5
Number of failures: 0
Operation time to live: Forever

MOS is listed here.

BB

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