Pause option:
On the number pad, this will either appear as a comma (,) or “pause.” Using this option means that when you dial a number, the extension is used automatically after the dialer app detects that the phone has been answered.
这个适用在 dialthrough
Wait option:
The wait option appears as semicolon (;) or “wait” on the number pad.This option should be used when you are calling somewhere that requires listening to the entire automated message before allowing any menu or extension selections. Instead of just keying the numbers for you, a pop-up will appear on the screen with extension, asking if you should send it now. It will remain on the screen while in the call until you decide to send the extension or cancel.
没有想出这个有啥用
如何显示一个 dial pad
http://stackoverflow.com/questions/6450583/how-to-display-a-dial-pad