I'm trying to build a Google Assistant Action that dials a phone number (using my device and my phone number) and once the call is connected interact using Dialogflow's voice synthesis to interact for a few minutes before connecting me.
Is there an option to do this inside the Actions SDK?
The desired behavior is to do this the same way Assistant does when I say "Hey Google call Mom". (This might be a North America only feature at the moment) Basically, it connects the call via my Google account phone number so caller ID looks like it's from me via either a mobile device or smart speaker.
Dialogflow appears to have a beta telephony option that might be a usable workaround, but it's a handoff, not the call coming from me.
Alternately is there a service like Twilio for voice calls?