Bug No sound when using discord backend

[irgendwr]

Operating System: Linux, Ubuntu 16.04.3 LTS (LXC Container)
SinusBot Version: (secret internal version)
TS3 Version: 3.0.18.2

Problem Description
Halp, my Discord instance not makes sound. it works but just no sound.
pls send help fast, thx.
- irgendwer

ps: movement events and other stuff wurks, only no sound, i have checked that its not muted.
pps: hope I get nice answers, thanks!

Log Output:

2017-09-19T20:10:00+02:00 Done playing
2017-09-19T20:10:00+02:00 Channels now zero
2017-09-19T20:10:00+02:00 Removing channel
2017-09-19T20:06:15+02:00 Storing configuration.
2017-09-19T20:05:58+02:00 PLAY [admin] ff0f8e40-0955-466b-beee-614b7bbf927f OK
2017-09-19T20:05:58+02:00 New channel ff0f8e40-0955-466b-beee-614b7bbf927f ()
2017-09-19T20:05:53+02:00 Done playing
2017-09-19T20:05:53+02:00 Channels now zero
2017-09-19T20:05:53+02:00 Removing channel
2017-09-19T20:05:52+02:00 STOP [admin] OK
2017-09-19T20:05:52+02:00 Stopping
2017-09-19T20:05:45+02:00 Storing configuration.
2017-09-19T20:05:30+02:00 PLAY [admin] 234bd355-4f61-44f5-a486-285fffac6eab OK
2017-09-19T20:05:30+02:00 New channel 234bd355-4f61-44f5-a486-285fffac6eab ()
2017-09-19T20:05:30+02:00 Done playing
2017-09-19T20:05:30+02:00 Channels now zero
2017-09-19T20:05:30+02:00 Removing channel
2017-09-19T20:05:29+02:00 STOP [admin] OK
2017-09-19T20:05:29+02:00 Stopping
2017-09-19T20:03:58+02:00 Storing configuration.
2017-09-19T20:03:58+02:00 voice handler returned with: dial tcp 88.202.186.3:443: getsockopt: connection timed out
2017-09-19T20:02:10+02:00 New channel 3eba1f42-1bcc-4bb1-b962-95f112780577 ()
2017-09-19T20:02:10+02:00 PLAY [admin] 3eba1f42-1bcc-4bb1-b962-95f112780577 OK
2017-09-19T20:01:48+02:00 got voice server information, let's connect
2017-09-19T20:01:47+02:00 client now online