Systems usually require verbal or telephone keypad entry of information. Testing should be done to determine an appropriate length of time to wait; keep in mind that phone keypads can be awkward and very slow for entering textual information.

• 系统通常需要的是键盘输入信息或者语音输入信息，可以通过测试来决定等待时间的长短。 要记住，用电话的小键盘来输入文字信息很不方便，而且很慢。