def answer(call)
      cmd = "ALTER CALL #{call.call_id} ANSWER"
      r = Skype.send_command cmd
      raise RuntimeError("Failed to answer call.  Skype returned '#{r}'") unless r == cmd
    end
def answer(call)
      cmd = "ALTER CALL #{call.call_id} ANSWER"
      r = Skype.send_command cmd
      raise RuntimeError("Failed to answer call.  Skype returned '#{r}'") unless r == cmd
    end
Answers a call given a skype Call ID.  Returns an Array of Call objects.