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QoS over the WAN

Hi

I have received a complain from one of my customer that they have a quality issue in the VoIP calls between two branches.

I tried to troubleshoot and I found that there is a jitter. while there is no QoS applied between the branches, I am going to add QoS as below:

Access switches; Configuration:

mls qos

mls qos map cos-dscp 0 8 16 24 32 46 48 56

Access Switches; IP Phones Ports:

mls qos trust device cisco-phone

mls qos trust cos

Access Switches; Trunk interfaces:

mls qos trust dscp

Core switch:

mls qos trust dscp

Router: (LAN Interface)

mls qos trust dscp

Router: (WAN Interface)

interface fast 0/0

bandwidth 2000

auto qos voip

I am sorry if it is silly but this is the first time I am trying to implement QoS.

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