startPhoneCall implementation
startPhoneCall implementation

this is the initial implementation for starting a phone call
sets toType to 'did'
does not use endpoint object, but signaling should work as it creates an
object for the recipient with the id set to the phone number vs the
endpoint_id
uses existing signalingChannel and call objects
the call object will need to be modified to limit the functionality when
toType is 'did'

Needs testing.

respoke/respoke,respoke/respoke,respoke/respoke