Voice messaging system with user-specified time for deleting messages

<u>Field of the Invention</u>

The present invention relates to telecommunications, and, in particular, to telecommunications systems that provide voice messaging.

<u>Description of the Related Art</u>

Voice messaging, whether provided by a local telephone answering machine or a network-based system, allows a caller to leave a voice message when the callee is not available to answer the call. When the callee later reviews the voice message, she is typically given the option of either deleting it or retaining it in memory for future processing, e.g., repeated playback. Whether deleting a message involves merely removing pointers or actually clearing memory space of the message bits, deleting means that the message is made unavailable for retrieval by the typical user of the voice-messaging system.

One of the limitations of conventional voice messaging systems is the finite amount of memory allocated to recording incoming voice messages from callers. When messages are saved indefinitely by a callee for future processing, the amount of memory available to record subsequent incoming messages is even further limited. As a result, subsequent callers may be unable to leave new messages if and when the allocated memory is completely filled with old messages. Likewise, when there are multiple outgoing messages, e.g., with specific messages being supplied for particular identified callers, such messages may have relevance for only a limited duration, yet take up memory until manually deleted or changed.

<u>Summary of the Invention</u>

To alleviate these problems, in accordance with the principles of the invention, a voice messaging system is arranged to delete stored voice messages at a user-specified time on a per-voice-message basis. In accordance with an aspect of the invention, both caller-left messages as well as callee-stored messages may be associated with delete times and be deleted accordingly. Moreover, in accordance with another aspect of the invention, the delete time information for caller-left or callee-stored messages may be specified by the caller or the callee.

In one embodiment of the invention, a voice messaging system includes a processor connected to a memory for storing the incoming and outgoing voice messages. The processor automatically deletes each stored voice message after the occurrence of, or the elapsing of, a corresponding user-specified time in accordance with the principles of the invention.

<u>Brief Description of the Drawings</u>

<ul id="ul0001" list-style="none" compact="compact"><li>Fig. 1 shows a block diagram of a voice messaging system, according to one embodiment of the present invention;</li><li>Fig. 2 shows a flow diagram of the processing implemented by the system of Fig. 1 when a caller leaves a voice message for a callee; and</li><li>Fig. 3 shows a flow diagram of the processing implemented by the system of Fig. 1 when a callee retrieves a voice message from a caller.</li></ul>

<u>Detailed Description</u>

The present invention addresses the limited memory resources of voice messaging systems. In particular, a voice messaging system of the present invention enables a user to specify a time for retaining each voice message. The time may be a particular length of time, e.g., a number of days or weeks, or a particular time of day, in hours and minutes, and date by month, day, and year. In one embodiment, the callee has the ability to specify the retention time when reviewing voice messages previously left by callers. In one variation of that embodiment, each caller is also able to specify a retention time when his voice message is initially recorded. In either case, the system will automatically delete the voice message after the retention time has expired if the callee has not, in the interim, extended that time.

Fig. 1 shows a block diagram of a voice messaging system <b>100</b>, according to one embodiment of the present invention. Voice messaging system <b>100</b> could be a local telephone answering machine, such as a consumer product for the home or office, or a network-based system that provides voice messaging capabilities to multiple network users. For example, a network-based system could support all the employees at a company's office. Another type of network-based voice messaging system is resident in the central office of a telephone service provider and provides voice messaging capabilities to the customers of that service provider. The basic block diagram of Fig. 1 shows the functionality supported by a voice messaging system for any of these situations.

In particular, transmitter <b>104</b> of Fig. 1 transmits voice messages from system <b>100</b> to the user, receiver <b>106</b> receives voice messages and dual tone, multi-frequency (DTMF) signals from the user, e.g., generated in response to a user pressing the keys of a telephone keypad, and memory <b>108</b> stores both incoming and outgoing voice messages, e.g., in a compressed digital format. Processor <b>102</b> coordinates the activities of the other components of system <b>100</b>, including the interpretation of information received by receiver <b>106</b>, the generation of messages for transmission by transmitter <b>104</b>, and the manipulation, e.g., storage, retrieval, and deleting, of voice messages from memory <b>108</b>. When a caller uses system <b>100</b> to leave a voice message for a callee, the caller is the user of system <b>100</b>. Similarly, when a callee uses system <b>100</b> to retrieve and process stored voice messages, or to generate outgoing voice messages for subsequent callers, the callee is the user of system <b>100</b>. Memory <b>108</b> may be any suitable device for storing voice messages, including magnetic tape recorders and computer memory devices, such as hard drives and random access memory (RAM).

Fig. 2 shows a flow diagram of the processing implemented by system <b>100</b> of Fig. 1 when a caller leaves a voice message for a callee, according to one embodiment of the present invention. System <b>100</b> transmits a pre-recorded message to the caller asking the caller to leave a voice message (step <b>202</b> of Fig. 2). System <b>100</b> then receives and stores the voice message from the caller (step <b>204</b>).

In one embodiment of the present invention, system <b>100</b> queries the caller for a time for retaining the current message (step <b>206</b>). A system query involves transmitting an outgoing voice message to the caller asking the caller to enter a retention time for his message. Depending on the implementation, the caller may enter the retention time via DTMF signals or simply by speaking the desired date/time or time period. In either case, the system then processes the callee's response to implement the callee's selection. The caller is able to select any desired time for the system to retain the voice message. System <b>100</b> automatically deletes the voice message if the time expires before the callee retrieves the message (step <b>208</b>).

Enabling the caller to specify a retention time for saving her voice message provides more efficient use of system memory resources. There are many times when callers leave messages that have relevance for only relatively short periods of time. For example, the message may be an invitation for the callee to join the caller at a specific event. The message may no longer be relevant if the callee has not retrieved the message after the event has already occurred. Allowing the caller to specify a retention time for retaining a voice message avoids filling the system's memory with irrelevant messages.

The retention time could be selected by duration, e.g., numbers of days or weeks, or by end time, e.g., identifying time and date of deletion by month, day, and year. System <b>100</b> preferably provides a default retention time for saving voice messages, which can be superseded by the caller specifying a different retention time. The default retention time could be to store a message indefinitely. System <b>100</b> also preferably gives the callee the ability to disable this function, so that all caller voice messages are retained indefinitely until after being reviewed by the callee.

Fig. 3 shows a flow diagram of the processing implemented by system <b>100</b> of Fig. 1 when a callee retrieves a voice message from a caller, according to one embodiment of the present invention. System <b>100</b> queries the callee about playing back stored voice messages (step <b>302</b> of Fig. 3). If the callee chooses to listen to the stored voice messages, system <b>100</b> transmits to the callee a recorded voice message previously left by a caller (step <b>304</b>). System <b>100</b> then queries the callee for deleting or saving the current message (step <b>306</b>). If the callee selects the delete option (step <b>308</b>), system <b>100</b> deletes the message (step <b>310</b>). Note that, in this embodiment of the present invention, system <b>100</b> provides the callee, for a certain period of time, e.g., 1 hour or 1 day, with the option of retrieving a deleted voice message. This would allow a callee to retrieve and save a voice message that was accidentally or inadvertently deleted.

If the callee selects the message save option (step <b>308</b>), system <b>100</b> queries the callee for a retention time for saving the current voice message (step <b>312</b>). The callee is able to select a different retention time for each voice message saved. System <b>100</b> preferably provides a default retention time for saving voice messages. The retention time could be selected by duration, e.g., numbers of days or weeks, or by end time, e.g., identifying time and date of deletion by month, day, and year.

In addition, system <b>100</b> may also be designed to query the callee for a message identifier (step <b>314</b>). A message identifier identifies the message as belonging to a particular category of messages, for example, messages from the callee's mother or messages from different people about the same topic, e.g., responses to an invitation to a party. The message identifier could be a word or phrase spoken by the callee or one or more DTMF signals corresponding to the desired category. In such an embodiment, system <b>100</b> would provide the callee with the ability to retrieve stored messages category by category.

In another possible embodiment of the present invention, system <b>100</b> is able to interpret the voice message left by the caller to generate automatically a message identifier for the message. Such message interpretation is described in U.S. Patent No. 5,504,805, the teachings of which are incorporated herein by reference. This could occur, for example, if the callee fails to provide a message identifier. In this case, the message identifier could be the caller's phone number or caller's name, which would be identified by interpreting the voice message. Alternatively, the caller's phone number could be provided by a caller ID function for use in a message identifier.

In any case, system <b>100</b> saves the current voice message, categorized according to the message identifier for those embodiments that support message identifiers (step <b>316</b>). After the specified retention time expires, without the callee in the interim otherwise extending the retention time, system <b>100</b> will automatically delete the voice message (step <b>318</b>). This feature prevents memory <b>108</b> of voice messaging system <b>100</b> from getting filled with old messages that may or may not be of further importance to the callee. This feature is particularly useful in network-based voice messaging systems where any number of users may be competing with the limited and potentially expensive memory resources of the system. The present invention prevents users from abusing the voice messaging system by retaining messages indefinitely at the expense of the system's ability to record new messages.

In one embodiment of the present invention, a callee can store voice messages for playback as outgoing messages to subsequent callers and assign individual retention times to these outgoing messages. Each outgoing message may be designated for specific callers, e.g., as identified from CallerID information, for specific groups of callers, or even for all callers. In any case, the system automatically deletes a voice message at the expiration of its corresponding retention time.

It will be further understood that various changes in the details, materials, and arrangements of the parts which have been described and illustrated in order to explain the nature of this invention may be made by those skilled in the art without departing from the principle and scope of the invention as expressed in the following claims.