Monday, 22 February 2016

Prioritize SIP / voice traffic with QoS / traffic-shaping on the ASA

The configuration following demonstrates how you can shape traffic on the outside interface - limiting it to 5mbps for the outside interface - although ensuring SIP traffic is being prioritized:
priority-queue outside
queue-limit 2048
tx-ring-limit 256
class-map Voice
match dscp ef sip rtp
exit
policy-map p1_priority
class Voice
priority
exit
exit
policy-map p1_shape
class class-default
shape average 5000000
service-policy p1_priority
exit
exit
Note: 'class-default' defines everything - except any other traffic matched in the policy.

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