If voice chat is important to you then theres plenty of third party options that are available to you that probably work a hell of a lot better than PSN or even a built-in voice chat. In fact, if it's a program you can use for your smart phone, you can use it to get a hold of other players in your raid group who are offline, if they have nothing going on then it'd be another option to try to get one of them to go online and join instead of using PF.

If I remember right, WoW had implemented an in-game voice chat a few years back, but every one just kept on using third party chat programs like Ventrilo due to the fact that in-game chat sucked so hard.