Initiate an outbound call.
Method: POST
Endpoint: /omni/voice/{user_id}/call
System Authorization: Authorization: Key=your-auth-key
User Authentication: tokenKey: {token}
Initiate an outbound call.
Method: POST
Endpoint: /omni/voice/{user_id}/call
System Authorization: Authorization: Key=your-auth-key
User Authentication: tokenKey: {token}