Softphones on PineTab or PinePhone

[my3ke]

So far I don't have Pine anything here at home to toy with and am waiting for a Pinetab w/keyboard to ship.  But while I'm waiting, I got to thinking what could be possible for it and maybe the Pinephone as well.  Like VOIP softphones maybe?  Linphone looks interesting and I'm sure there are others.  Could be useful when hanging around a hotel where your cell service doesn't work since it's wifi calling.

Thinks it's possible?

Thanks for your input!