post https://api.phone.com/v4/accounts//calls
This API places a call to the caller phone number (or caller extension ID). If that number (or extension) answers within the timeout period, then the callee DID (or extension) will be connected to the call.
Make a phone call. You need to provide caller and callee information (as extensions or phone number). At least one extensions should be provided (caller_extension or callee_extension).