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NBX 3000 - Dead silence during calls

NBX 3000 - Dead silence during calls

NBX 3000 - Dead silence during calls

I'm experiencing an intermittant problem with my NBX3000 analog, firmware v6_0_40. Every now and again, on an external call we will get a silence on the line, neither party can hear the other. it usually lasts for 5-10 seconds, and can happen at any stage during the call.
I'm connected to a Fractional Rate HDSL line (16 channels) and it happens across a number of different channels. I've replaced our T1 card on the NBX and got our Telco to replace the HDSL modem, and the problem still occurs.
Has anyone ever seen this behavior before? It's driving me nuts!

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