A few things you can do:
Find out where your WAN circuits are. Don't know? Do a traceroute and telnet to each device, and use show ip route and show run interface to find out. Look for a WAN interface with a policy map. After you find out which interface the packet is going out of on each hop, do a 'show policy-map interface' and see if the selected interface has QoS applied.
Also, IP SLA is your friend. Here's a little bit I configured/tested:
Sending side:
ip sla monitor 3
type jitter dest-ipaddr 172.16.1.2 dest-port 16384 codec g711ulaw codec-numpackets 30
tos 184
frequency 10
ip sla monitor schedule 3 start-time now
ip sla monitor 4
type jitter dest-ipaddr 172.16.35.5 dest-port 16386 codec g711ulaw codec-numpackets 20
tos 184
frequency 5
ip sla monitor schedule 4 start-time now
Receiving side:
ip sla monitor responder
R3#sh ip sla moni stat
Round trip time (RTT) Index 3
Latest RTT: 54 ms
Latest operation start time: 00:11:46.823 UTC Tue Jan 1 2008
Latest operation return code: OK
RTT Values
Number Of RTT: 13
RTT Min/Avg/Max: 108/124/153 ms
Latency one-way time milliseconds
Number of one-way Samples: 0
Source to Destination one way Min/Avg/Max: 0/0/0 ms
Destination to Source one way Min/Avg/Max: 0/0/0 ms
Jitter time milliseconds
Number of Jitter Samples: 7
Source to Destination Jitter Min/Avg/Max: 5/6/7 ms
Destination to Source Jitter Min/Avg/Max: 1/1/1 ms
Packet Loss Values
Loss Source to Destination: 17 Loss Destination to Source: 0
Out Of Sequence: 0 Tail Drop: 0 Packet Late Arrival: 0
Voice Score Values
Calculated Planning Impairment Factor (ICPIF): 25
Mean Opinion Score (MOS): 3.50
Number of successes: 20
Number of failures: 0
Operation time to live: 3393 sec
Round trip time (RTT) Index 4
Latest RTT: 2 ms
Latest operation start time: 00:12:01.167 UTC Tue Jan 1 2008
Latest operation return code: OK
RTT Values
Number Of RTT: 20
RTT Min/Avg/Max: 2/2/2 ms
Latency one-way time milliseconds
Number of one-way Samples: 0
Source to Destination one way Min/Avg/Max: 0/0/0 ms
Destination to Source one way Min/Avg/Max: 0/0/0 ms
Jitter time milliseconds
Number of Jitter Samples: 19
Source to Destination Jitter Min/Avg/Max: 0/0/0 ms
Destination to Source Jitter Min/Avg/Max: 0/0/0 ms
Packet Loss Values
Loss Source to Destination: 0 Loss Destination to Source: 0
Out Of Sequence: 0 Tail Drop: 0 Packet Late Arrival: 0
Voice Score Values
Calculated Planning Impairment Factor (ICPIF): 1
Mean Opinion Score (MOS): 4.34
Number of successes: 6
Number of failures: 0
Operation time to live: 3570 sec
hth,
nick
