Obviousness

An analysis of the obviousness of U.S. Patent 6,108,329 ("the '329 patent") under 35 U.S.C. § 103 is provided below, based on the prior art cited by the patent examiner during prosecution. The analysis concludes that the claims of the '329 patent would have been obvious to a person of ordinary skill in the art (PHOSITA) as of the priority date of December 18, 1995.

Deconstruction of Independent Claim 1

Independent claim 1 of the '329 patent can be broken down into the following key limitations for analysis:

a) System Architecture: A telephone apparatus connected via a telephone network to an internet network, which uses a server for transmitting audio data.
b) Server Database: The server maintains a database with user information, including a public phone number for Point-to-Point Protocol (PPP) and an IP address.
c) Caller Information Forwarding: The server sends information identifying the calling party to the destination apparatus.
d) Local Caller List: The destination apparatus stores a list of approved callers in a local memory.
e) Call-Type Determination: The apparatus can determine whether an incoming call is a data call via its modulator/demodulator (modem) or a standard voice call over the telephone network.
f) Data Connection Handling: If the call is a data call, the apparatus establishes a PPP connection.
g) Voice Connection Handling: If the call is not a data call, it establishes a standard telephone connection.
h) Caller Screening: The apparatus compares the received caller information against its stored list of approved callers.
i) Connection Control: The apparatus connects or disconnects the call based on the result of the caller screening.
j) E-mail Storage: The apparatus can receive and store an e-mail message if the user does not answer the call.

Obviousness Combination and Motivation to Combine

The limitations of claim 1 would have been obvious to a PHOSITA by combining the teachings of prior art references that addressed known problems in both the telephony and data networking fields. A particularly strong combination exists in WO 1996/038018 A1 (Ericsson), hereinafter "WO '018", in view of U.S. Patent 5,062,133 (Logotronix) and U.S. Patent 5,546,448 (Multi-Tech Systems).

1. Primary Reference: WO '018 (System for Hybrid Network Voice Calls)

WO '018, with a priority date of May 24, 1995, discloses the core architecture of the '329 patent. It teaches a system for setting up a voice call that travels partially over the traditional Public Switched Telephone Network (PSTN) and partially over a data network like the Internet. The express motivation is to reduce costs for long-distance calls.

• Teaches Limitations (a), (b), (c): The system in WO '018 uses servers (gateways) on a data network. A user connects to a local server via the telephone network. This server looks up information about the destination and routes the call over the data network to a server near the recipient, which then completes the call. This inherently requires the server to maintain and use a database of user/routing information (similar to a phone number and network address) and to handle caller information to establish the end-to-end connection. Therefore, WO '018 discloses the fundamental system of using a server on a data network to facilitate a voice call initiated from a telephone apparatus.

2. Secondary Reference: U.S. Patent 5,062,133 (Call Management and Screening)

U.S. Patent 5,062,133 to Logotronix, filed in 1989, teaches a sophisticated telephone call management system that addresses the problem of unwanted calls.

• Teaches Limitations (d), (h), (i): Logotronix explicitly discloses a system that uses incoming Caller ID information to screen calls. The system stores lists of telephone numbers designated by the user and compares the incoming caller's number to these lists. Based on the comparison, the system can take various actions, including connecting the call, blocking it, or routing it to an answering machine.

• Motivation to Combine WO '018 with Logotronix: A PHOSITA in 1995 would have been motivated to combine the call-screening features of Logotronix with the Internet telephony system of WO '018 for a clear and compelling reason: to solve a known problem. The '329 patent itself notes the desire to "avoid or reject mischievous or misdirected telephone calls" (Col. 4, ll. 5-7). This was a well-understood issue in traditional telephony, and Logotronix provided a well-understood solution. As voice communications moved to a new medium (the Internet), it would have been entirely predictable and obvious to implement the same proven screening features in the new system. The server in WO '018 already processes caller information for routing; it would have been a simple design choice to forward this information to the end user's device to allow it to perform the screening functions already common in advanced telephones, as taught by Logotronix.

3. Secondary Reference: U.S. Patent 5,546,448 (Caller ID Modem Interface)

U.S. Patent 5,546,448 to Multi-Tech Systems, filed in 1994, is directed to the specific technical problem of creating a device that must handle both incoming voice calls and incoming data calls on the same line.

• Teaches Limitations (e), (f), (g): Multi-Tech discloses a modem interface that can intelligently distinguish between different types of incoming calls before answering. It describes a method for detecting the presence of a Caller ID signal (indicating a voice call) versus a modem carrier tone (indicating a data call). This allows the device to respond appropriately—by handling a voice call or establishing a data connection.

• Motivation to Combine with WO '018 and Logotronix: The '329 patent claims a single "telephone apparatus" that performs both as a standard telephone and an Internet telephone. A PHOSITA tasked with building such a device would immediately confront the need for it to differentiate between incoming call types. Multi-Tech provides a direct and explicit solution to this exact implementation challenge. The motivation to incorporate the teachings of Multi-Tech is one of practical necessity; without a mechanism to distinguish call types, a dual-function device would be inoperable. Therefore, adding the call-type determination logic of Multi-Tech to the Internet-capable, call-screening telephone derived from WO '018 and Logotronix would have been an obvious step to make the product functional.

4. The E-mail Limitation (j)

The final limitation, receiving and storing an e-mail if a call is unanswered, would have been obvious in light of the art related to unified messaging, such as WO 1996/020553 A2 (Alphanet). Alphanet, with a 1994 priority date, teaches a unified messaging system that combines voice mail, fax, and e-mail into a single user mailbox. The motivation was user convenience. A PHOSITA developing an Internet-based communication device would naturally look to integrate various Internet-based services. If a user is unavailable for a real-time voice call over the Internet, allowing the caller to send an e-mail—another native Internet data type—is a logical and predictable extension, consistent with the known trend toward unified communications.

Conclusion

The independent claim of the '329 patent represents a combination of known elements from the prior art, with each element performing its expected function. A PHOSITA would have been motivated to combine the Internet telephony architecture of WO '018 with the established call-screening features of Logotronix to provide a desired feature (security/privacy) in a new environment. To make such a dual-use device functional, it would have been necessary and therefore obvious to incorporate a call-type-detection mechanism as taught by Multi-Tech. The result of this combination would be a telephone apparatus possessing all the key features of claim 1 of the '329 patent.