Yeah, probably. From what I've read about them, they're decent phones for more generic type SIP services. You're not going to get Avaya-specific features on them, but you shouldn't have too much trouble getting the absolute basics working. As far as I can tell, they make nice phones that work on free asterisk PBXs that providers can offer some hosted voip with. Beyond curiosity or just because I happened to have one, I wouldn't have any particular reason to care about it.