On my 3102 this was due to the setting NAT keep alive (clearly a router matter) but if set to NO the 3102 will still register OK and will ring when first switched on, but after a while will say the same thing, essentially the VSP seems to have lost track of it and think it is down when it is still up and you can make outgoing calls, rebooting the device get it to register afresh and receving calls again. Setting NAT keep alive to ON resolve the problem
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