Ringing multiple phones or apps with Twilio

I have a Twilio number

• I have a TwiML app (3rd party web app)
• I have a SIP phone (configured to a SIP domain)
• I have a regular mobile phone

I know Twilio is very powerful, but also complex. I try to find out how I can achieve one of the following scenarios:

1. All phones should ring simultanously
2. If one phone is picked up
3. Other phones should stop ringing

I am quite sure, that this could be done. But I do not know how?

It is not important, which Tools used (Studio, Functions, TwiML, Google Code, or a mix of these...)

First I thought I can do this completely in Studio. I know I can ring multiple PSTN phones together, but how can I solve that with different types of phones.

Can someone please point mein the right direction? Maybe there is some "tutorial" or example code, I did not found

I'm not sure if Studio can handle making calls simultaneously to SIP and regular phones, but you can definitely achieve this with TwiML.

To ring more than one phone at a time, you use the <Dial> verb and nest the endpoints that you want to dial within. For dialling a regular phone you can use <Number> and for dialling a SIP phone you can use <Sip>.

<Response>
  <Dial>
    <Number>YOUR_MOBILE_PHONE_NUMBER</Number>
    <Sip>sip:username@exampl.com</Sip>
  </Dial>
</Response>

The documentation for parallel calling with Sip does note that:

In order to use the SIP Parallel Calling Twilio feature, you must enable the "Enhanced Programmable SIP Features" in your Voice settings in the Console.