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IP SLA for Isolating Voice Packets Being Dropped

Test calls between site A and site B affirm users' complaints and phone statistics at site B show intermittent massive Rcvr Lost Packets count incrementing. MPLS network in-between both sites. I've validated DSCP=EF for voice stream packets received at site B. Site A "show policy-map int" shows PQ is not dropping any packets, and looking at site B's MPLS PE priority queue, I don't see any drops there.

So I am setting IP SLAs on both CE WAN routers to see if perhpaps the provider may be dropping (voice) packets in their cloud.   

On router A, I have config:

ip sla 30

udp-jitter 10.10.252.30 16390

tos 46

verify-data

ip sla schedule 30 life forever start-time now ip sla 30
udp-jitter 10.10.252.30 16390
tos 46
verify-data
ip sla schedule 30 life forever start-time now

On router B, I have the config:

ip sla responder

My question(s) - "show ip sla statis shows: My questions are

1)  the operation id of 30 (which is my SLA #) do not show any RTT information

2) Do I assume that operation number 126489, 126490, 126491 are just sequential re-iterations of "operation id 30"?

It seems my jitter is all-over the place and my thougt is now that the phone at site B is discarding packets due to excessive latency BETWEEN packets which the phone's jitter buffer cannot compensate.. Anyway, below is my SLA statis output.....can someone verify my questions 1 and 2 above please?

THANKS!


IPSLA operation id: 30
Type of operation:
        Latest RTT: Unknown
Latest operation start time: Unknown
Latest operation return code: Unknown
RTT Values:
        Number Of RTT: 0                RTT Min/Avg/Max: 0/0/0 milliseconds
Number of successes: 0
Number of failures: 0
Operation time to live: Forever

IPSLA operation id: 126489
        Latest RTT: NoConnection/Busy/Timeout
Latest operation start time: 16:41:47.930 UTC Thu Oct 11 2012
Latest operation return code: Timeout
Number of successes: 0
Number of failures: 13
Operation time to live: Forever

IPSLA operation id: 126490
        Latest RTT: NoConnection/Busy/Timeout
Latest operation start time: 16:41:49.622 UTC Thu Oct 11 2012
Latest operation return code: Timeout
Number of successes: 0
Number of failures: 13
Operation time to live: Forever

IPSLA operation id: 126491
        Latest RTT: 51 milliseconds
Latest operation start time: 16:41:51.465 UTC Thu Oct 11 2012
Latest operation return code: OK
Number of successes: 13
Number of failures: 0
Operation time to live: Forever


IPSLA operation id: 126492
        Latest RTT: 120 milliseconds
Latest operation start time: 16:41:53.336 UTC Thu Oct 11 2012
Latest operation return code: OK
Number of successes: 13
Number of failures: 0
Operation time to live: Forever

IPSLA operation id: 126493
        Latest RTT: 191 milliseconds
Latest operation start time: 16:41:55.184 UTC Thu Oct 11 2012
Latest operation return code: OK
Number of successes: 12
Number of failures: 1
Operation time to live: Forever

IPSLA operation id: 126494
        Latest RTT: 51 milliseconds
Latest operation start time: 16:41:57.035 UTC Thu Oct 11 2012
Latest operation return code: OK
Number of successes: 13
Number of failures: 0
Operation time to live: Forever

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