how is the mos factor or r-factor calculated

[rabeder]

hi,

my question is how i can calculate the mos value.

is there a directly correspondence between icpif and mos?

or is the correspondence between the r-factor and mos ?

here is a output of the routers sla agent:

MPLSRBGORTR01#sh ip sla monitor collection-statistics 20192001

Entry number: 20192001

Start Time Index: 09:36:00.952 MES Mon Aug 21 2006

Number of successful operations: 16

Number of operations over threshold: 0

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

Voice Scores:

MinOfICPIF: 11 MaxOfICPIF: 11 MinOfMOS: 4.06 MaxOfMOS: 4.06

RTT Values (milliseconds):

NumOfRTT: 16000 RTTAvg: 4 RTTMin: 2 RTTMax: 26

RTTSum: 67593 RTTSum2: 304199

Packet Loss Values:

PacketLossSD: 0 PacketLossDS: 0

PacketOutOfSequence: 0 PacketMIA: 0 PacketLateArrival: 0

InternalError: 0 Busies: 0 PacketSkipped: 0

Jitter Values (milliseconds):

MinOfPositivesSD: 1 MaxOfPositivesSD: 21

NumOfPositivesSD: 1528 SumOfPositivesSD: 3389 Sum2PositivesSD: 11883

MinOfNegativesSD: 1 MaxOfNegativesSD: 16

NumOfNegativesSD: 1516 SumOfNegativesSD: 3369 Sum2NegativesSD: 11631

MinOfPositivesDS: 1 MaxOfPositivesDS: 4

NumOfPositivesDS: 1201 SumOfPositivesDS: 1532 Sum2PositivesDS: 2352

MinOfNegativesDS: 1 MaxOfNegativesDS: 4

NumOfNegativesDS: 1190 SumOfNegativesDS: 1531 Sum2NegativesDS: 2383

Jitter Avg: 1 JitterSD Avg: 2 JitterDS Avg: 1

Interarrival jitterout: 0 Interarrival jitterin: 0

One Way Values (milliseconds):

NumOfOW: 16000

OWMinSD: 1 OWMaxSD: 23 OWSumSD: 34811 OWSum2SD: 92619

OWMinDS: 1 OWMaxDS: 6 OWSumDS: 32782 OWSum2DS: 69572

OWAvgSD: 2 OWAvgDS: 2

Start Time Index: 08:36:00.948 MES Mon Aug 21 2006

Number of successful operations: 30

Number of operations over threshold: 0

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

Voice Scores:

MinOfICPIF: 11 MaxOfICPIF: 11 MinOfMOS: 4.06 MaxOfMOS: 4.06

RTT Values (milliseconds):

NumOfRTT: 30000 RTTAvg: 4 RTTMin: 2 RTTMax: 25

RTTSum: 126600 RTTSum2: 565324

Packet Loss Values:

PacketLossSD: 0 PacketLossDS: 0

PacketOutOfSequence: 0 PacketMIA: 0 PacketLateArrival: 0

InternalError: 0 Busies: 0 PacketSkipped: 0

Jitter Values (milliseconds):

MinOfPositivesSD: 1 MaxOfPositivesSD: 22

NumOfPositivesSD: 2654 SumOfPositivesSD: 5749 Sum2PositivesSD: 18535

MinOfNegativesSD: 1 MaxOfNegativesSD: 20

NumOfNegativesSD: 2651 SumOfNegativesSD: 5736 Sum2NegativesSD: 18328

MinOfPositivesDS: 1 MaxOfPositivesDS: 5

NumOfPositivesDS: 5133 SumOfPositivesDS: 5601 Sum2PositivesDS: 6867

MinOfNegativesDS: 1 MaxOfNegativesDS: 7

NumOfNegativesDS: 5151 SumOfNegativesDS: 5599 Sum2NegativesDS: 6815

Jitter Avg: 1 JitterSD Avg: 2 JitterDS Avg: 1

Interarrival jitterout: 0 Interarrival jitterin: 0

One Way Values (milliseconds):

NumOfOW: 30000

OWMinSD: 0 OWMaxSD: 23 OWSumSD: 52523 OWSum2SD: 118923

OWMinDS: 1 OWMaxDS: 12 OWSumDS: 74077 OWSum2DS: 193055

OWAvgSD: 1 OWAvgDS: 2

thanks for answer

[gpulos]

with IOS 12.3(14)T and higher use this command to get MOS and ICIPF scores:

show ip sla monitor collection-statistics (as you've used above); view the output as shown below: (excerpt from your output)

Voice Scores:

MinOfICPIF: 11 MaxOfICPIF: 11 MinOfMOS: 4.06 MaxOfMOS: 4.06

(any value of zero means that score was not generated; your MOS score for this is 4.06)

ICPIF corresponds to the score as set by the dialPeer that sent the call. (cisco specific i believe; calculatedPlanningImpairmentFactor)

MOS corresponds to the industry standard of voice quality measurement at the destination end and is expressed as a number from 1 (lowestQuality) to 5 (highestQuality)

you could say that there is correspondence between R-factor and MOS, but not R-factor and ICPIF.

[rabeder]

ok, thanks f answer - sounds logical, but:

if you say my mos corresponds to r-factor - can i calculate the r-factor from the output above?

(sh ip sla collection-stat)

or are the parameters to get the r-factor not in the output

(only for interrest)