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Low MOS, high concealment seconds, no packet loss

I'm troubleshooting a weird issue we're seeing due to some reports from Cisco Prime, which is reporting that a call leg through a SIP Trunk to voice gateway is showing random low MOS scores. Looking into the details the concealment seconds could be as follows:

Call Duration : 560 sec

Concealment:  410 sec

Packet loss: 0

Codec: G711ulaw 64k

Jitter: 1ms

There is no preceived call quality issues reported from the end users though...

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