Inter-system call transfer

Details Inter-system call transfer Inter-system call transfer

1999-05-07

2002-05-28

Smith, Creighton (Department: 2642)

Telephonic communications

Audio message storage, retrieval, or synthesis

Interacting voice message systems

C379S221010, C379S212010

Reexamination Certificate

active

06396909

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to voice messaging systems, and more particularly to a multiple node messaging system wherein each Network Interface Unit or Telephony Services Platform (which is a form of Network Interface Unit) is shared by two or more host computers.
BACKGROUND OF THE INVENTION
Messaging systems that provide voice, fax and/or e-mail messaging capabilities are well known.
FIG. 1
illustrates an exemplary prior art messaging system developed by Unisys Corporation, Blue Bell, Pa., the assignee of the present invention. The system of
FIG. 1
comprises multiple servers (which may be implemented, e.g., with A-series or Clearpath™ computers offered by Unisys Corporation) each supporting a network applications platform (NAP), which provides an underlying platform for storage and retrieval of messages, and a messaging application running on the platform. A voice mail application, such as the Unisys Universal Voice Messaging System (UVMS), is an example of a messaging application that runs on the messaging platform. The UVMS application determines how calls to the messaging system are handled, what prompts are played to callers, and which features are available. Such applications typically maintain a database of subscribers who have “mailboxes” on the system. The messaging platform interfaces to a telephone network through a Network Interface Unit (NIU). Received messages are stored by the messaging platform in a local message store, or voice file.
The network applications platform, or NAP, may be located at a local telephone company connected to one or more central offices or switches, or could alternatively be located on the premises of a customer, such as a large or medium-sized company. In the latter case, the NAP would typically be connected to a private branch exchange (PBX) instead of directly to a PSTN. Telephone customers typically demand high (close to 100%) system availability, which means that, for a large customer having hundreds or even thousands of employees at a given location, it is extremely difficult to take the telephony application off-line for even a short time to make updates or modifications. Therefore, when it becomes necessary to modify the application in any way, the application provider needs a way to make such modifications in a way that maintains system availability. This need is particularly severe for high volume telephony systems, which typically cannot be taken out of service without inconveniencing significant numbers of users.
Network Interface Units are available from a number of different vendors. For example, NIUs suitable for use with the present invention include: (a) the Telephony Services Platform available from Unisys Corporation, Blue Bell, Pa.; (b) the Summa Four VCO 80 available from Summa Four, Inc., Manchester, N.H.; and (c) the Voice Frame 2020 available from Harris Corporation, Melbourne, Fla. The Telephony Services Platform (TSP) is most preferred. The difference between it and the other products just mentioned is that the TSP includes a board that plays back digitized voice from a voice file whereas the other products require a separate playback module.
In use, if a subscriber is not available when an incoming call is received, the Public Switched Telephone Network (PSTN) forwards the call to the messaging system, which typically allows the caller to record a message, and then will store the message for later retrieval by the subscriber. A key (or token) returned to the messaging application uniquely identifies the stored message data within the message store. This key can be used at a later time to retrieve the message from the message store for playback to the subscriber.
In the exemplary system shown in
FIG. 1
, a first node of the system comprises a server/NAP
10
a
, voice file and database
12
a
and NIU
14
a
. Similarly, a second node comprises a server/NAP
10
b
, voice file and database
12
b
and NIU
14
b
; and a third node comprises a server/NAP
10
c
, voice file and database
12
c
and NIU
14
c
. The first node, e.g., could be responsible for a predefined geographic area encompassing hundreds of thousands of subscribers, or simply for a predefined set of telephone lines or circuits. The respective nodes are separately coupled to a public switched telephone network, or PSTN,
16
, and are thereby made accessible to their subscribers. Moreover, subscribers of one node can employ messaging to transfer copies of messages (such as voice messages) to subscribers of another node. The respective nodes may or may not share access to each other's voice files (see copending application Ser. No. 09/161,214, filed Sep. 25, 1998, “Multiple Node Messaging System Wherein Nodes Have Shared Access To Message Stores Of Other Nodes”).
An important characteristic of a messaging system is that it be highly reliable and able to quickly recover from system failures. This characteristic is generally referred to as system “availability.” The present invention relates to a messaging system architecture that comprises multiple redundant messaging nodes in order to achieve high availability. The present invention was developed in the process of designing a messaging system that would continue to provide access to user services even while one host computer (or disk) is inoperative or otherwise unable to process a call. A goal of the present invention is to implement the “shared TSP” concept described below such that each TSP has the ability to route a call to any one of a number of hosts. More particularly, the present invention was designed to permit a call routed to an application on one host to be transferred to an application on a different host.
Further background information concerning the construction and operation of messaging systems, and particularly systems employing a Network Applications Platform (NAP) for interfacing a telephone network and network applications running on an enterprise server, may be found in the following patents and copending patent applications, which are hereby incorporated by reference:
U.S. Pat. No. 5,133,004, Jul. 21, 1992, “Digital Computer Platform for Supporting Telephone Network Applications”;
U.S. Pat. No. 5,138,710, Aug. 11, 1992, “Apparatus and Method for Providing Recoverability in Mass Storage Data Base Systems Without Audit Trail Mechanisms”;
U.S. Pat. No. 5,384,829, Jan. 24, 1995, “Digital Computer Platform for Supporting Telephone Network Applications”;
U.S. Pat. No. 5,323,450, Jun. 21, 1994, “Telephone Network Applications Platform for Supporting Facsimile Applications”;
U.S. Pat. No. 5,494,606, Feb. 20, 1996, “Multi-Lingual Prompt Management System for a Network Applications Platform”;
U.S. Pat. No. 5,633,916, May 27, 1997, “Universal Messaging Service Using Single Voice Grade Telephone Line Within a Client/Server Architecture”;
U.S. patent application Ser. No. 08/944,924, filed Oct. 6, 1997, “Enhanced Multi-Lingual Prompt Management in a Voice Messaging System With Support for Speech Recognition” (attorney docket TN078);
U.S. patent application Ser. No. 08/964,744, filed Nov. 5, 1997, “Methods and Apparatus for Providing External Access to Executable Call Flows of a Network Application” (attorney docket TN079);
U.S. patent application Ser. No. 08/987,571, filed Dec. 11, 1997, “Multiple Language Electronic Mail Notification of Received Voice and/or Fax Messages” (attorney docket TN091);
U.S. patent application Ser. No. 09/094,126, filed Jun. 9, 1998, titled “Universal Messaging System Providing Integrated Voice, Data and Fax Messaging Services to PC/Web-based Clients, Including a Session Manager for Maintaining a Session Between a Messaging Platform and the Web-based Clients” (attorney docket TN094);
U.S. patent application Ser. No. 09/093,593, filed Jun. 9, 1998, titled “Universal Messaging System Providing Integrated Voice, Data and Fax Messaging Services to PC/Web-based Clients, Including a Content Manager for Receiving Information from Content Providers and Formatting the Same into Multimedia Containers for Distribution to Web-based Cl

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