Apparently, there are a few different issues that you will be able to see if you are failing to connect to voice. Aside from ICE checking and no route, another one is called Discord RTC connection issue. Do you want to know more about it? Please keep reading the article until the last word.
As stated before, all of them are different issues. However, they are generally related to the same kind of technical issue which is Discord is being stopped in its tracks when attempting to connect to the voice server. It means the method to fix all the three issues are the same.
For those who are having those kinds of issue mentioned above, here are the steps that you can try in order to resolve those errors. The very first thing that you need to do is to restart the modem, router and computer. You might be surprised at how often the trick named “turn it off and turn it back on again” works. Then, check either Firewall or anti virus and make sure that Discord is whitelisted or temporary disabled. The thing thing that should be done is to check the VPN. Please take a note that Discord only works on VPNs that have UDP. After that, check with the network admin. For those who are using the work or school network, Discord could be blocked. When this step is done, please change the voice region. For the admin, you are able to try different voice region in Server Settings -> Server region. Beside, admin will also be allowed to change the voice region in private voice calls. In the next step, please disable QoS. You can do it by going straight to Use Settings. Then, head over to Voice & Video and turn off “enable Quality of Service High Packet Priority”. For the last step, you have to go to http://test.webrtc.org/ and see if any errors pop up.
If you still face the issue of Discord RTC connection even after you have followed all the steps, you do not have to be panic and worried about the way out as there is another alternative that you can try. This one is to join the voice channel or voice call. After that, hit Ctrl+Shift+i in order to bring up the Developer Tools. For the last step, you have to do is to click the Console tab.
If it still remains the same even after the last alternative, please call the customer service of Discord. You are are also recommended to seek a help from an expert who knows about this kind of thing related to Discord RTC connection issue. Aside from that, you you might want to seek a help from the community related to the topic. There might be the answer to the question o fthe issue on the community. If there is no answer yet, you can try to discuss with the members about the best thing that you can do.