Greetings, zedo.
Unfortunately, there isn´t any way to implement an voice chat ingame, but these are the ones you requested:
IP for Argonath Teamspeak is here :
http://wiki.argonathrpg.eu/index.php?title=Main_Page (not sure, whether it´s down or not.)
Also, an IV:MP official Discord channel :
https://discordapp.com/invite/WsU4x3HIV:MP client doesn´t work with the 1.0.8.0., but as many have noticed, there is an T4 version in work and it will be much better than the current one, it will run on GTA EFLC, which means it will have more possibilites for you players, we are trying as hard as we can, just be patient and await the future update, for now, you can play on the standard T3, once it comes back online.