Abstract: An internet protocol (IP) phone establishes a conference call with a plurality of other IP phones until the IP phone has no available audio mixing capacity. The IP phone selects one of the other IP phones having available audio mixing capacity in the conference call when a new IP phone is to join the conference call but the IP phone has no available audio mixing capacity. The IP phone further transmits a selection message to the selected one of the other IP phones to make the selected one of the other IP phones to mix audio line of the new IP phone to accept the new IP phone joining the conference call.

Abstract: A hand-held device including a touch screen includes a detection module and a user interface control module. The touch screen displays content, and receives a slide input. After detecting the slide input, the detection module records slide area information of the slide input, and determines if the slide input corresponds to a menu display command. If the slide input corresponds to the menu display command, the user interface control module controls the touch screen to display icons of menu options related to the content in the slide area allowing a user to see the menus related to the content and ease of selection of the menus.