Use your own twimlet scripts to add a call to the conference, dial multiple numbers together, etc. in the Twilio auto dialer.
How to enter your script URL in dialer?
In keyword shortcuts, auto dialer has the option to enter either number or URL of twimlet scripts. If you dial the corresponding shortcuts the Twilio will invoke the URL, and the Twiml returned from the URL is processed by Twilio. This enables you possibilities to add a call to the conference, dial multiple numbers together, generate a sip call, set custom caller id, etc.