Multiple registrations from the same account and the same IP cannot work reliably to gurantee each device will receive the ring. You might try a simple solution if you want the ring goes preferrably to your softphone. Set the registraion expiration time in your softphone to 120, and 3600 in your hardware. This way, most of the rings will go to your softphone, however, there is still a 1/30 chance that incoming calls will ring your hardware.
Another problem from multiple registrations is that, after you close your softphone, there will be a period of time that incoming call might not reach the hardware depending on when the last time your softphone and hardware registered to the server and when your hardware will re-register with the server.
The best solution is to get it done in a PBX.
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