What Internet Voice Services Can Asterisk be Connected To

Hello everyone,

Does anyone know of any internet voice services, apart from GoogleTalk, Google Voice and Skype that Asterisk can be connected to for free?
Also, does anyone know how to connect Asterisk to Skype for free?

Microsoft have withdrawn the licence for Skype for Asterisk. I suspect you will find that other ways of hooking them together breach the Skype licence. Especially now that the free Skype is advertising funded, I can’t imagine them wanting the user interface to be bypassed for free calls.

I believe I’ve heard that Googletalk is going away as well.

More generally, if you find a free to use service that costs money to run, you need to carefully consider the business model. If your usage is not consistent with the business model, you should expect to lose the service relatively quickly.