I set up a server running Mekanism, and enabled voice chat on port 36123 mid-game after several clients had connected. I forwarded the port in my router, and myself and two other players tried to communicate over the walkie talkies in-game. We confirmed we were using the same channel in the walkie-talkies, and all were on, but no voice data got through.

Running netstat on the server computer showed connections between the server and the clients on the voice ports, with Recv-Q at ~50,000+ for each of them, and very low Send-Qs.

Disconnecting and reconnecting to the server (all players) did not alleviate the issue.

I completely exited my client and restarted, and the other players were able to hear me but I could not hear them. However when a second player completely restarted their client (the server is on my LAN) it did not fix anything.

We conscripted a third player to help test at this point, and they could not hear me either, despite the second player able to hear me just fine.

tl;dr Mekanism voice chat was able to open a connection to the server, but voice generally did not make it through.

Hmm. What version of Mekanism are you using, and what OS are you running the clients on?

I am running Win7 Ultimate x64 (Java x64)
The server is Linux version 3.2.0-4-amd64 ([email protected]) (gcc version 4.6.3 (Debian 4.6.3-14) ) #1 SMP Debian 3.2.54-2

I have asked the other players for their OS versions and I'll reply back when I have received that information.

Great, that sounds just fine. If you could just pass on the Mekanism version.

Mekanism 6.0.5, sorry. The other players are Win7 and Win8, too.

This should be fixed now :)