QoS commands from the 7921 deployment guide

QoS Commands for Autonomous Access Points

class-map match-all RTP
 match ip dscp ef
class-map match-all SCCP
 match ip dscp cs3

policy-map Voice
 class RTP
 set cos 6
class SCCP
 set cos 3

interface X
 service-policy input Voice
 service-policy output voice

IOS Router inerface to map RTP and SCCP correctly

ip access-list extended SCCP
 permit tcp any eq 2000 any
 permit tcp any any eq 2000

ip access-list extended RTP
 permit udp any range 16384 32767 any
 permit udp any any range 16384 32767

class-map match-all SCCP
 match access-group name SCCP
class-map match-all RTP
 match access-group name RTP

policy-map Voice
 class RTP
 set dscp ef

 class SCCP
 set dscp cs3

interface X
 service-policy input Voice
 service-policy output Voice