Cannot get voiceChannel playfile() example to work

With discord.js@9.2.0, I’m doing:

var Discord = require('discord.js');
var bot = new Discord.Client();
bot.login("token").then().catch(err => console.log(err));

bot.on('ready', (message) => {
  var voiceChannel = bot.channels.filter(g => {
    return g.type == 'voice' && g.name == 'General';
  }).first();

  voiceChannel.join()
   .then(connection => {
     console.log('playing');
     const dispatcher = connection.playFile('sound.mp3');
   })
   .catch(err => console.log(err));

});

The bot correctly joins the audio channel, but the ‘playing’ message is never displayed nor audio played.
I’m getting this output after 15 seconds:

Error: Connection not established within 15 seconds.
    at Array.client.setTimeout (/home/v/tjs/node_modules/discord.js/src/client/voice/ClientVoiceManager.js:121:43)
    at Timeout.setTimeout (/home/v/tjs/node_modules/discord.js/src/client/Client.js:163:16)
    at tryOnTimeout (timers.js:232:11)
    at Timer.listOnTimeout (timers.js:202:5)

Is this the new correct way of doing this ? Code for playing sample is taken from new documentation.

[loic-pryv]

@tuneitbaby it’s a bit late but here is the answere message.member.voiceChannel.join()

[vikbez]

The reason was firewall; on audio chat join, a UDP connection is done for audio (on port 52710 for me) firewall was blocking, connection never made, .then() code never executed etc etc. Hope this will help someone some day 🎉