Enter show rtp-stat thresholds. For example:

Gxxx-001(super)# show rtp-stat thresholds
Item                  Threshold      Event Threshold
--------------------  -------------  -----------------
Codec Loss            6.0%           1
Average Codec Loss    3.0%           N/A
Codec RTT             700mS          2
Echo Return Loss      0dB            1
Loss                  6.0%           2
Average Loss          3.0%           N/A
Remote Loss           6.0%           2
Average Remote Loss   3.0%           N/A
RTT                   500mS          2
Local Jitter          50mS           2
Remote Jitter         50mS           2
SSRC Changes          N/A            2