Digium D80 Noise

Does anyone have problems with noise on D80 phones? I only have one D80, and it’s not working well. It sounds like packet loss or high latency, but there does not appear to be any network problems. Also, all other phones in the same network segment have no problems. I just swapped it with a spare D62, and there is no noise on the line.

Maybe a bad power supply.

G729ab codec might be the culprit on some phones so switch to xlaw and see.