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When Callee has no internet and caller place call, ringing volume play on caller side and at server Status CallBack Request following status flow occur :

1.Initiated 2. Ringing 3. no-answer

So the question is why Ringing callback status occur while callee has not network connection.

philnash
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Giru Bhai
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1 Answers1

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The answer depends on the dial number and how the terminating carrier handles calls for that number. It is really difficult to say.

Alan
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  • Thanks to reply, I am talking about VOIP call. – Giru Bhai Mar 05 '20 at 04:19
  • Similar issue, the path to the VoIP device you are sending to may have a device called a Back-to-Back-UA (B2BUA) in the path which terminates and re-establishes the SIP session. It could be sending a 180-Ringing back to Twilio. "Ringing: Twilio has received a signal from our Super Network partner advising the destination phone is ringing." – Alan Mar 05 '20 at 13:25