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The V.A2 resolves some issues with a Motorola cordless phone chipset - and perhaps others.
Contact Primus TBB Technical Support if you have the V.A1 and are having problems with phones not ringing.
Note that you should test with only one phone at a time plugged into the DVG ATA. If there are multiple phones connected to the DVG, there may be other factors whereby the phones do not ring !