Twilio iOS SDK incoming call not received

Question

I have an app where users on the app can make and receive calls. I'm having an issue where, when an outside user (+1234567890) is trying to call the Twilio number and connect with user john, client app is not receiving the incoming call.

User (+1234567890) calls Twilio number, when connected it dials the user john which is on the client app.

Access token is created with incomingAllow permission. identity also matches with the TwiML response of the incoming call function.

<Response >
   <Dial callerId="+1234567890">
      <Client><Identity>john</Identity></Client>
  </Dial>
</Response>

Call logs on the dashboard shows status as not answered.

I referred voice-quickstart-ios sample app. (https://github.com/twilio/voice-quickstart-ios) My code is basically the same.

TwilioVoiceSDK.register(accessToken: self.accessToken, deviceToken: cachedDeviceToken)

Above function returns success as well. Any help would be much appreciated.

Answer 1

Figured it out. Apple push certificate id on Twilio Credentials was not enabled for Sandbox environment.