[JeremyBanks]

Google Voice has never received a lot of attention or polish. (Disappointing to me, as a user since it was still named GrandCentral.) I hope it is integrated into Hangouts, because presumably it would see more improvement as part of such an important product than it sees now.

[yeukhon]

It is sad. I like Google Voice a lot. When it came out it was ahead of its time. When my phone is down I can use Voice to make calls for free (I am US based). I don't think Voice is available to international users yet? Have it?

The ability to call people using Google is already available on Hangout. If you upgrade your Gmail to use Hangout (I still have accounts that are not using Hangout) you will make calls via Hangout interface.