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Configuring Qos for VoIP

sarfarazkazi
Level 1
Level 1

Dear All,

Hi, I have a cisco 2811 router. I would like to configure QoS for VoIP on that. Can someone guide me with the same?

Attached is the configuration of the router.

Regards

sarfaraz

16 Replies 16

cuevas
Level 5
Level 5

This is what I've done normally for QoS of VOIP. now this is QoS over an MPLS

class-map match-any AF41

match ip dscp af41

match access-group name AF41_VOICE_CONTROL

class-map match-any VOICE

match ip dscp ef

match access-group name EF_SOFTPHONE

match ip precedence 5

!

!

policy-map 50_49

class VOICE

priority percent 50

set ip dscp ef

class AF41

set ip dscp af41

bandwidth percent 49

class class-default

set ip dscp default

fair-queue

ip access-list extended AF41_VOICE_CONTROL

permit tcp any 10.21.192.0 0.0.0.255 eq 2000

permit tcp any 10.21.192.0 0.0.0.255 eq 2428

permit udp any 10.21.192.0 0.0.0.255 eq 2427

permit tcp any 10.21.192.0 0.0.0.255 eq 1720

ip access-list extended EF_SOFTPHONE

permit udp any range 16384 16390 any

For QoS on the LAN, i just noramlly use Auto QoS

One caution: using fair queue in the class-default doesn't seem to strictly adhere to keeping the bandwidth settings for other non-LLQ classes on most routers.

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