Ooma is servicing my home telephone numbers. I have the Ooma Premiere service which is $120/year or $10/month. With Ooma Premiere, I get two telephone numbers included with my plan. While this will seem like overkill, I do try to put both numbers to use.
Line 1 is the number that is displayed for when I make an outgoing call with my home phone. Line 2 is used with important callers that call my Google Voice number. Such important callers will ring my home phone in addition to my cellular phone.