Abstract:
Extensions are provided for mobile electronic devices including cellphones, wherein different extensions may correspond to different communication contexts. In an exemplary embodiment, a call is answered using an automated answering system. The caller is requested to enter an extension number. In response to the extension number, a call alert (such as a ring tone) unique to that extension is activated.

Description:
BACKGROUND 
     1. Field of the Invention 
     The present invention relates to mobile electronic devices such as cellphones. 
     2. State of the Art 
     With the widespread adoption of cellphones, increasing numbers of users rely exclusively on their cellphones for voice communications. A user, however, will typically have several distinct communication contexts: e.g., work, family, outside business, etc. If the cellphone is equipped with caller-ID (CID), the context of the call may be determined some of the time. Depending on the caller (e.g., frequent or first-time), determining the context using CID may require minimal effort and take an instant or an appreciable effort and take a few moments. Answering of the call may be rushed, without sufficient opportunity to prepare for the context of the call as may be desired. 
     SUMMARY 
     The present invention, generally speaking, provides extensions for mobile electronic devices including cellphones, wherein different extensions may correspond to different communication contexts. In an exemplary embodiment, a call is answered using an automated answering system. The caller is requested to enter an extension number. In response to the extension number, a call alert (such as a ring tone) unique to that extension is activated. 
    
    
     
       DESCRIPTION OF DRAWING 
       The foregoing may be further understood from the following description in conjunction with the appended drawing. In the drawing: 
         FIG. 1  is a block diagram of a mobile electronic device in which the invention may be used. 
         FIG. 2  is a flowchart illustrating call handling by the mobile electronic device of  FIG. 1 . 
         FIG. 3  is an example of an extensions setup screen. 
         FIG. 4  is an example of another extensions setup screen. 
         FIG. 5  is an example of another extensions setup screen. 
         FIG. 6  is an example of another extensions setup screen. 
     
    
    
     DETAILED DESCRIPTION 
     Referring now to  FIG. 1 , a block diagram is shown of a mobile electronic device in which the invention may be used. A processor  101  is coupled to memory  103 , to a display sub-system  105 , and to an input sub-system  107 . The processor is also coupled to a sound sub-system  109  and a communications sub-system  111 . 
     Referring to  FIG. 2 , call handling of the mobile electronic device of  FIG. 1  will be described. In step  201 , the program check to see whether an incoming call is being received. The mobile electronic device may have extensions turned on or turned off in accordance with user settings. If extensions are turned on (Step  203 ), then an automatic answering routine answers the call (Step  205 ) and prompts the caller to enter an extension number. This prompt may be recorded by the user in the user&#39;s own voice or downloaded, in which case the prompt may be professionally recorded. The prompt may or may not describe available extensions. If not, then a type of call screening occurs by default. The caller then enters an extension number, and the mobile electronic device, using, for example DTMF detection (Step  207 ), determines the entered extension number. If the extension number is not a valid one (Step  209 ), the caller is re-prompted to enter a valid extension number. If after some number of times a valid extension number is not received, the call may then be terminated with a polite “goodbye.” 
     If a valid extension number is received, then the mobile electronic device produces a call alert (Step  211 ); for example, it produces a ring using an extension-specific ring tone. Alternatively, the same ring tone may be used for all extension numbers, but with the extension number (together with a user description of that extension, if desired) being displayed so as to be visible to the user prior to answering the call. 
     Optionally, the mobile electronic device may in addition play an extension-specific message to the caller (Step  213 ). For example, the message might say, “Thank you for calling Gumball International. Your call will answered momentarily. Please hold.” The user might answer the call in the midst of the message, in which case it continues to play to completion, after which the user may say hello. The user might answer the call after delay following completion of the message, in the same manner. Or, a time limit may expire without the user answering the call, in which case a follow-on message may apologize and prompt the caller to leave a message. Such operation provide the user an opportunity to complete a task or extricate him or herself from a conversation if needed in order to take a call. 
       FIG. 3  shows an example of an extensions setup screen. Using this screen, the user is able to turn extensions on or off. 
       FIG. 4  shows another example of an extensions setup screen. Using this screen, the user enters extension numbers and associated descriptive text. 
       FIG. 5  shows another example of an extensions setup screen. This screen represents the ability of the user to associate distinctive ring tones with each specified extension number. 
       FIG. 6  shows another example of an extensions setup screen. As depicted in this screen, call setup is complete, and each specified extension has associated with it both descriptive text and a distinctive ringtone. In the case of any particular extension number, it may have associated only descriptive text, only a distinctive ringtone, or both. 
     In alternative embodiments, the extensional functionality described may be realized in the network instead of in the handset, with setup being accomplished through the internet. Extension information may be transmitted using caller-ID (CID) or similar mechanisms. In the case of CID, the extension information may be transmitted following the first ring signal. If desired, the mobile electronic device may be programmed to suppress the first ring signal prior to the receipt of extension information. In this embodiment, extensions become a value-added service offered by service providers. 
     It will be appreciated by those of ordinary skill in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential character thereof. The described embodiments are therefore considered in all respects to be illustrative and not restrictive. The scope of the invention is given by the appended claims, not the foregoing description, and all changes which come within the meaning and range of equivalents thereof are intended to be embraced therein.