ah, truly sorry we don't support that! whatsapp messaging (i.e. sms) API is a thing -- but takes a lot of effort to get setup & approved.

for voice... I truly don't know. it seems possible via some very entreprise-y twilio solutions, but it's not simple.

sorry again about this! if anyone knows the whatsapp (or telegram?) to pstn/phone channel?? stuff well - let me know here! thanks!