I have been using a VOIP provider and the delay and quality just isn't there, so we are going to go back to the standard line we have been using as a backup. I am looking at the SPA3102 to connect the standard line to the 3CX and use the IP phones as our extensions. Is this a good way to go or is there a better adapter? I will not be using any VOIP, just a standard line so what is the easiest way to set it up? Thanks.