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

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.

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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