QoS on ADSL Router cisco 826

Hi,
I want to priorise voip traffic on a cisco 826. The current setup is
attached, but does not do the job - bad voice quality when there is other
outgoing traffic on the link. Any ideas?


class-map match-all voice
match access-group 102

!-- match rtp ports
access-list 102 permit udp any any range 11000 12000
!-- match sip
access-list 102 permit tcp any eq 5060 any
access-list 102 permit tcp a ..
Telecom, Cabling and VoIP continues...