Enable Differentiated Services Code Point (DSCP) preservation on the Cisco IOS switch and/or use a QoS policy to set
•
DSCP to EF for RTP traffic (UDP port range 16384-32767) on the Cisco IOS router.
For more information about TCP and UDP ports used by the Cisco Unified IP Phone 9971 and the Cisco Unified
Communications Manager, refer to the Cisco Unified Communications Manager TCP and UDP Port Usage document at this
URL:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/port/7_1_2/CCM_7.1.2PortList.pdf
Configuring QoS in Cisco Unified Communications Manager
The SIP DSCP values are configured in the Cisco Unified Communications Manager enterprise parameters. Cisco Unified
Communications Manager uses the default value of CS3 to have devices set the DSCP marking for SIP packets as shown in the
Enterprise Parameters Configuration page.
Configuring QoS Policies for the Network
Set up QoS policies and settings for the following network devices.
Configuring Cisco IOS Access Points
Use the following QoS policy on the Cisco IOS access point (AP) to enable DSCP to CoS (UP) mapping. This allows RTP
packets to be placed into the voice queue, if those packets are marked correctly, when received at the access point level.
class-map match-all RTP
match ip dscp ef
class-map match-all Video
match ip dscp af41
class-map match-all SIP
match ip dscp cs3
!
policy-map Voice
class RTP
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