... when we get calls it sounds like we are using dialup internet ...
When you make calls, is it ok? Does the problem affect GV? a SIP provider (which one)? OBiTALK? Does the dial tone sound choppy? Is the choppy voice heard by you, the remote party, or both? If GV is affected, are calls made from Gmail also bad? If SIP is affected, do you have the same problem with a softphone?
If there is not trouble with the affected provider(s) when connecting via another device, trying a factory reset is a good idea. If you are provisioning the device directly (not via OBiTALK), you should back up your configuration, so you can easily restore it after the reset.