Twilio forward call to another Twilio number with custom parameters

Question

I'd like to forward an ongoing Twilio call to a different Twilio Number and pass along custom parameters.

I was able to dial away using Twiml <Dial> + <Number> https://www.twilio.com/docs/voice/twiml/dial but it's not possible to pass along custom data.

Answer 1

You cannot pass along custom parameters across the Public Switch Telephone Network (PSTN). It is not supported by that network.

What is the use case and how would the dialed party even be able to pull out those custom parameters?