PacketLossSD IP SLA MOS

Unanswered Question
Apr 21st, 2010

Hello,

Peridocally we see MOS deviations that cannot be explained by errors on the network (primarily our radio WAN).  This sample shows PacketLossSD.  The router we use for IP SLA does not show any output drops, nor do any of the relevant switch interfaces between the SLA router and the responder.  All switches do not show any QOS issues, nor any relevant queue drops.  Are there any additional things that can be checked to determine where the packet loss is occurring?  Additional ideas would be apprecated. The SLA router and responder (router) are separated by three switches:

SLA-Router<-->3750<-->6506<-->3550<-->Responder

Voice Scores:

ICPIF Value: 38 MOS score: 2.85
RTT Values (milliseconds):
NumOfRTT: 247   RTTAvg: 2       RTTMin: 2       RTTMax: 3
RTTSum: 496     RTTSum2: 998
Packet Loss Values:
PacketLossSD: 753       PacketLossDS: 0
PacketOutOfSequence: 0  PacketMIA: 0    PacketLateArrival: 0
InternalError: 0        Busies: 0       PacketSkipped: 0
Jitter Values (milliseconds):
MinOfPositivesSD: 1     MaxOfPositivesSD: 1
NumOfPositivesSD: 35    SumOfPositivesSD: 35    Sum2PositivesSD: 35
MinOfNegativesSD: 1     MaxOfNegativesSD: 1
NumOfNegativesSD: 35    SumOfNegativesSD: 35    Sum2NegativesSD: 35
MinOfPositivesDS: 1     MaxOfPositivesDS: 1
NumOfPositivesDS: 33    SumOfPositivesDS: 33    Sum2PositivesDS: 33
MinOfNegativesDS: 1     MaxOfNegativesDS: 1
NumOfNegativesDS: 33    SumOfNegativesDS: 33    Sum2NegativesDS: 33
Jitter Avg: 1   JitterSD Avg: 1 JitterDS Avg: 1
Interarrival jitterout: 0       Interarrival jitterin: 0
One Way Values (milliseconds):
NumOfOW: 247
OWMinSD: 1      OWMaxSD: 2      OWSumSD: 282    OWSum2SD: 352
OWMinDS: 1      OWMaxDS: 1      OWSumDS: 214    OWSum2DS: 214
OWAvgSD: 1      OWAvgDS: 0
Bucket Index: 80
Aggregation start time 07:18:22.629 PDT Wed Apr 21 2010
Target Address: 10.8.2.26
Number of failed operations due to a Disconnect: 0
Number of failed operations due to a Timeout: 0
Number of failed operations due to a Busy: 0
Number of failed operations due to a No Connection: 0
Number of failed operations due to an Internal Error: 0
Number of failed operations due to a Sequence Error: 0
Number of failed operations due to a Verify Error: 0

I have this problem too.
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