"window is not defined" when using JsSIP in Node.JS

[FloppiTuna]

I'm able to create a connection between JsSIP and my Asterisk/FreePBX server, however as soon as it receives/sends a call, it throws the following exception:

/Users/tuna/src/Quizmaster/node_modules/jssip/lib-es5/RTCSession.js:269
      if (!window.RTCPeerConnection) {
      ^

ReferenceError: window is not defined
    at RTCSession.connect (/Users/tuna/src/Quizmaster/node_modules/jssip/lib-es5/RTCSession.js:269:7)
    at UA.call (/Users/tuna/src/Quizmaster/node_modules/jssip/lib-es5/UA.js:241:15)
    at file:///Users/tuna/src/Quizmaster/index.js:36:18
    at ModuleJob.run (node:internal/modules/esm/module_job:195:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:337:24)
    at async loadESM (node:internal/process/esm_loader:34:7)
    at async handleMainPromise (node:internal/modules/run_main:106:12)

The code:

import JsSIP from 'jssip';

var socket = new JsSIP.WebSocketInterface('ws://x.x.x.x:8088/ws');
var configuration = {
  sockets  : [ socket ],
  uri      : 'sip:[email protected]',
  password : '....'
};

var ua = new JsSIP.UA(configuration);

ua.start();

ua.on('registered', () => {
    console.log('Registered!');
})

ua.on('newRTCSession', function(data){
   console.log("Call!");
});