CallToken support for Conference /Participants API

Developers can now provide a call token from an incoming Programmable Voice call when creating a new conference participant in order to reuse the caller ID from that incoming call.

Previously, call token support was only available for the /Calls API, and developers who wanted to use the /Participants API were limited to using Twilio phone numbers or verified caller IDs as the caller ID when doing a POST to /Participants. 

To reuse the caller ID from an inbound Programmable Voice call when creating a new conference participant simply pass the CallToken from the inbound call as a parameter to the /Participants API.

For more information, see our docs.