Voice chat using Steamworks api

I’ve asked this before on the old forums, but thought I should repost (given that people can no longer post on the old forums).

Has anyone integrated voice chat using the Steamworks api?

I’m looking to implement a proximity voice chat to my UDK project, such that players can press/hold a key to chat to other players within their proximity.

Any advice or insight would be greatly appreciated.

I sort of assumed once logged into steam then use of the functions below would become possible, although that is more blind hope then expectation (based on my other experiences with steam integration):

Also I know it GC not steam but may give a clue, see the very small section on voice …

If you need help testing PM me

Thanks for the response, and links.