It's a pair-once-and-forget-it. You can set it up to automatically switch between devices, like your computer or your phone or something else, but I find that i

It's a pair-once-and-forget-it. You can set it up to automatically switch between devices, like your computer or your phone or something else, but I find that it sometimes connects to the wrong thing. I've gone into my iPhone and basically said "Always sync to HA". I haven't tried with a landline. I don't have a landline.