Network telephony appliance and system for inter/intranet telephony

• US 9,413,585 B2
• Filed: 08/17/2012
• Issued: 08/09/2016
• Est. Priority Date: 06/08/1999
• Status: Expired due to Term

• Current Assignee: Trustees Of Columbia University In The City Of New York (Columbia University)
• Original Assignee: Trustees Of Columbia University In The City Of New York (Columbia University)
• Inventors: Schulzrinne, Henning, Yin, Jianqi
• Primary Examiner(s): Hashem, Lisa
• Application Number:
  US13/588,369
• Publication Number:
  US 20130016715A1
• Time in Patent Office: 1,453 Days
• Field of Search: 709/227, 709/220, 709/230, 379/38, 379/372, 379/219, 379/88.07, 370/261, 370/353
• US Class Current: 1/1
• CPC Class Codes: G06F 3/167 Audio in a user interface, e.g. using voice commands for navigating, audio feedback
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 2012/6486 Signalling Protocols
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/10 of different types
• CPC Class Codes: H04L 61/45 Network directories; Name-to-address mapping
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 69/085 specially adapted for interworking of IP-based networks with other networks
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42

Abstract

A network appliance (100) is provided having a network controller subsystem (110) for coupling the appliance (100) to a data network for providing and receiving data packets to and from a packet data network. A digital signal processing subsystem (120) is coupled to the network controller subsystem (110). A signal conversion subsystem (130) is coupled to the digital signal processing subsystem (120) and a user interface subsystem (160) is coupled to both the signal conversion subsystem (130) and the digital signal processing subsystem (120). The digital signal processing subsystem (120) operates under the control of a computer program which is capable of detecting incoming calls, initiating call sessions, and preferably, implementing advanced telephony features.

Claims

1. A system for digital signal processing over a network, comprising:

a first network device and a second network device, each network device comprising a digital signal processor and one or more memory devices coupled to said digital signal processor, the one or more memory devices comprising;

a first layer of instructions stored in said one or more memory devices of said digital signal processing subsystem operable to provide interrupt services and low-level functions,

a second layer of instructions stored in said one or more memory devices of said digital signal processing subsystem comprising an operating system and instructions operable to perform process level functions, and

a third layer of instructions stored in said one or more memory devices of said digital signal processing subsystem operable to perform application-specific tasks and high-level functions,

wherein at least one of the network devices operates as a User Agent Client (UAC) to detect and initiate call sessions and perform call session control according to Session Initiation Protocol (SIP) functions and at least one of the network devices operates as a User Agent Server (UAS) to detect and receive call sessions and perform call session control according to SIP functions.

2. The system according to claim 1, wherein the first network device operates as a UAC and the second network device operates as a UAS.

3. The system according to claim 1, wherein the first network device operates as a UAS and the second network device operates as a UAC.

4. The system according to claim 1, wherein the first network device operates as a UAC and as a UAS.

5. The system according to claim 4, wherein the second network device operates as a UAC.

6. The system according to claim 5, wherein the second network device further operates as a UAS.

7. The system according to claim 1, wherein the third layer of instructions includes at least one of Session Initiation Protocol (SIP) functions for detecting an SIP state, Real-Time Transport Protocol (RTP) functions for providing real-time audio data transport, and Address Resolution Protocol (ARP) functions to resolve alphanumeric addresses.

8. The system according to claim 7, wherein the third layer of instructions includes SIP functions for detecting an SIP state, and wherein the SIP state comprises idle or busy.