I have redundancy in both phone and internet services. I run incoming voice and fax lines through Comcast, and also get their internet and cable. I have two other phone lines for outgoing calls, and DSL internet through CenturyLink. I use the DSL as guest internet for my patients, but can switch to it if Comcast is done (which is has never been). For a while, I also had a Verizon business-class dongle and corresponding router, which I used while on the road, but also as a backup to the backup internet in the clinic.
