Question : Service policy is in suspended mode

i have a 3640 router where qos was configured, when checking the qos with
show policy map int mu1
this message comes up

Service policy VOICE_VIDEO is in suspended mode
     any idea why ?

Answer : Service policy is in suspended mode

I'm not strong on QoS, but I did see in the 12.4T documentation where the policy can be suspended if you've configured a guarantee that exceeds the available BW.  See http://www.cisco.com/en/US/docs/ios/qos/configuration/guide/qos_mqc_ps6441_TSD_Products_Configuration_Guide_Chapter.html.  You might also search for troubleshooting guides in general.