ip SLA RTP based VOIP Operation - To find out MOS value

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May 13th, 2008
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Hi All,


I am new to VOIP. We are trying to find out the MOS value in our VOIP network. For that we thought of using IP SLA RTP Based VOIP operation to get the MOS values. http://www.cisco.com/en/US/docs/ios/12_4t/12_4t4/htrtpvip.html



I ve used 3825 with NM HDV module with 3 DSP as SLA originator and AS 5400 XM as SLA responder.


But i'm not getting the MOS values,


show ip sla statistics shows that the operation failed due to Format Failure.


I ve attached the config of my 3825. Kindly go through it and advise if any changes to be done.



In AS 5400 XM there is no special config related to this. I ve enabled only " IP SLA RESPONDER"


Error message:


LAB-3825-R6# sh ip sla stat


Round Trip Time (RTT) for Index 1

Type of operation: rtp

Latest operation start time: *05:04:58.707 UTC Wed May 14 2008

Latest operation return code: Format failure

Latest RTT (milliseconds): 0

Source to Destination Path Measurements:

Interarrival Jitter: 0

Packets Sent: 0

Packets Lost: 0

Estimated R-factor: 0 MOS-CQ: 0.00

Destination to Source Path Measurements:

Interarrival Jitter: 0

Packets Sent: 0

Packets Lost: 0

Estimated R-factor: 0 MOS-CQ: 0.00

Operation time to live: Forever

Operational state of entry: Active

Last time this entry was reset: Never



LAB-3825-R6# sh ip sla stat aggre


Round Trip Time (RTT) for Index 1

Type of operation: rtp

Start Time Index: *05:06:21.019 UTC Wed May 14 2008

Number of successful operations: 0

Number of operations over threshold: 0

Number of failed operations due to a Timeout: 0

Number of failed operations due to a No Connection: 1

Number of failed operations due to an Internal Error: 5

Number of failed operations due to a Sequence Error: 0

RTT (avg/min/max): 0/0/0 ms

Source to Destination Path Measurements:

Interarrival Jitter (avg/min/max): 0/0/0

Packets Sent (avg/min/max): 0/0/0

Packets Lost (avg/min/max): 0/0/0

Estimated R-factor (avg/min/max): 0/0/0

MOS-CQ (avg/min/max): 0.00/0.00/0.00

Destination to Source Path Measurements:

Interarrival Jitter (avg/min/max): 0/0/0

Packets Sent (avg/min/max): 0/0/0

Packets Lost (avg/min/max): 0/0/0

Estimated R-factor (avg/min/max): 0/0/0

MOS-CQ (avg/min/max): 0.00/0.00/0.00



Any help is greatly appreciated.


thanks in advance.



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arun kumar Wed, 05/14/2008 - 02:58
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Hi,


Even i tried using 2811 with NM HDV card but still getting the same error. I think something i've missed out in the configuration part. Can anyone advise.


thanks in advance

arun kumar Tue, 05/20/2008 - 02:47
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Hi,


AS 5400 cannot be used even as SLA responder for RTP probe. Thats the reason i got the Format Failure error. We can view the type of SLA Probes the router supports by issuing the following command:


sh ip sla application.


for eg below is what i ve taken from AS 5400



sh ip sla application

IP Service Level Agreements

Version: Round Trip Time MIB 2.2.0, Infrastructure Engine-II

Time of last change in whole IP SLAs: 10:48:00.737 IST Tue May 20 2008

Estimated system max number of entries: 49625


Estimated number of configurable operations: 49608

Number of Entries configured : 17

Number of active Entries : 17

Number of pending Entries : 0

Number of inactive Entries : 0


Supported Operation Types

Type of Operation to Perform: dhcp

Type of Operation to Perform: dlsw

Type of Operation to Perform: dns

Type of Operation to Perform: echo

Type of Operation to Perform: frameRelay

Type of Operation to Perform: ftp

Type of Operation to Perform: http

Type of Operation to Perform: icmpJitter

Type of Operation to Perform: jitter

Type of Operation to Perform: pathEcho

Type of Operation to Perform: pathJitter

Type of Operation to Perform: tcpConnect

Type of Operation to Perform: udpEcho

Type of Operation to Perform: voip


IP SLAs low memory water mark: 68416281


chnmgw1#



Hope this will help others looking for RTP based VOIP operation..



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