We have voIP between two sites, connected over MPLS and voice calls drop now and then. We use Avaya for Voice boxes and Cisco routers/switches elsewhere. QoS is configured on both ends of the MPLS to prioritize voice packets and I do not see any drops in the voice packets at both the ends under "sh policy-map interface" command.
I am new to Voice and wondering where to start the troubleshooting.
You will need to check first the codec configured in the dial-peers voip (Commonly G.729),
then check if you have configured the qos command in each dial-peer to mark voice packets.
ip qos dscp csX media
ip qos dscp csX signaling
ip precedence X (On earlier versions)
(where X is the Class of Service 3 or 5 depending on your MPLS Service Provider).
If you Voice Gateway is behind of your MPLS Router, you must be to configure a Policy-map in the Interface connected to the segment to identify and mark voice packets if this packet are not marked previously (service policy input XXX command).
Check in the output policy-map the command "priority XX" for the voice class (This ensure voice packets to go at priority queue).
And the last verify is the fragmentation in the output interface only if you use Frame Relay....
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