WO2005038594A2 - Method and apparatus for enhanced internet telephony - Google Patents
Method and apparatus for enhanced internet telephony Download PDFInfo
- Publication number
- WO2005038594A2 WO2005038594A2 PCT/US2004/033812 US2004033812W WO2005038594A2 WO 2005038594 A2 WO2005038594 A2 WO 2005038594A2 US 2004033812 W US2004033812 W US 2004033812W WO 2005038594 A2 WO2005038594 A2 WO 2005038594A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- message
- intermediate point
- internet
- source
- router
- Prior art date
Links
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/102—Gateways
- H04L65/1023—Media gateways
- H04L65/1026—Media gateways at the edge
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/255—Maintenance or indexing of mapping tables
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/256—NAT traversal
- H04L61/2564—NAT traversal for a higher-layer protocol, e.g. for session initiation protocol [SIP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1069—Session establishment or de-establishment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
- H04L65/1104—Session initiation protocol [SIP]
Definitions
- FIG. 1 is a schematic representation of an example user Internet Telephony environment.
- a cable modem 10 provides access to the Internet 20.
- the user employs an intermediate communication point, e.g., router 30 to provide multiple devices access to the Internet 20.
- the router 30 assigns respective private dynamic IP addresses to the Media Terminal Adapter 40 and to the computer 50.
- the Media Terminal Adapter 40 is coupled to a common telephone handset 60.
- the Media Terminal Adapter 40 receives * signals from the handset 60, creates packets and sends data packets to the Router 30. which in turn sends them to the cable modem 10 and eventually to the Internet 20.
- a major drawbacks of the above typical environment is the difficulty in accommodating the Network Address Translation (NAT) that is typically implemented by the router 30.
- NAT Network Address Translation
- a Dynamic Host Computer Protocol server running on the router 30 assigns private dynamic IP addresses to the Media Terminal Adapter 40 and computer 50; thus effecting Network Address Translation (NAT).
- NAT Network Address Translation
- the Media Terminal Adapter 40 then begins the communication/registration process with an Internet telephone service provider.
- the communication between the Media Terminal Adapter 40 and a server of the Internet telephone service provider employs a standard protocol such as Session Initiation Protocol. But, the router 30 performs the Network Address Translation on a timed basis. As is commonly known, typical routers used in home environments assign private IP addresses to devices connected to the router. But, those addresses are valid only for a limited time. Thus, after the limited time expires, the private address is no longer assigned to a given device, such as the Media Terminal Adapter 40. As a result, the SIP messages sent from Internet telephone service provider's server are not passed by the router 30 to the Media Terminal Adapter 40.
- FIG. 2 is a schematic representation of an example environment that addresses the issue of router 30 losing an outbound port during an Internet telephone connection.
- a destination e.g., a pre-proxy server 70 receives messages from the router 30.
- Pre- proxy server 70 records the private IP address of the Media Terminal Adapter 40 during, for example, the SIP registration process.
- the Media Terminal Adapter 40 passes fields used to communicate with the pre-proxy server 70. Examples of fields that can be passed include, for example, the private IP address of the Media Terminal Adapter 40, the public IP address of the router 30, and port information.
- the pre-proxy server 70 receives the information from the Media Terminal Adapter 40, the pre-proxy server 70 periodically sends, for example, blank UDP messages to the Media Terminal Adapter 40, which contain the same destination and source address as a typical SIP message would have. Other messages could be use in stead of the UDP message.
- the message used should prompt the Media Terminal Adapter 40 to send a response to the pre-proxy server70.
- the pre-proxy server 70 sends, for example, the UDP message to the router 30 using the public IP address of the router 30 and the port information received in the message from the router 30.
- the pre-proxy server 70 sends, for example, the UDP within the limited time that the router 30 maintains that private address assigned to the Media Terminal Adapter.
- the router 30 accordingly routs the message to the destination designated in the message from the pre-proxy server 70.
- the pre-proxy server 70 also maintains the private and public IP addresses of the MTA and rewrites the headers m the actual SIP messages based on this information.
- the present invention provides a method for providing enhanced Internet telephony that includes receiving a message from a source at an intermediate point; sending at least a portion of the message from the intermediate point to a destination over the Internet; sending a response to the message from the destination to the intermediate point over the Internet; sending the response from the intermediate point to the source; repeatedly sending other messages from the destination over the Internet to the intermediate point; sending at least a portion of corresponding ones of the other messages from the intermediate point to the source; and sending responses to the portions of the other messages from the source to the intermediate point.
- Figure 1 is a schematic representation of an example user Internet Telephony environment.
- Figure 2 is a schematic representation of an example environment intended to address the issue of a router losing an outbound port during an Internet telephone connection.
- Figure 3 is a schematic representation of an example environment employing the present invention.
- FIG. 3 is a schematic representation of an example environment employing the present invention.
- a user initiates a call using a telephone handset 60.
- the media terminal adapter 40 implements standard signaling between itself and an Internet telephony regional data center 80.
- the media terminal adapter 40 implements standard signaling between itself and an Internet telephony regional data center 80.
- SIP Real-time Transfer Protocol
- communication between the caller 60 and a customer in a destination area 100 proceeds using, for example, Real-time Transfer Protocol (RTP) between the caller and the a customer in the destination area 100 via the Internet 20 and, for example, a RTP relay 90 in Internet telephony point- of-presence 110 in the destination area 100.
- RTP Real-time Transfer Protocol
- the router 30 may close the outbound port after a timeout period.
- voice data from the customer in the destination area 110 will not reach the telephone handset 60 behind router 30.
- the present invention causes the media terminal adapter 40 to send an outbound message to the Internet telephony regional data center 80.
- One way of accomplishing this is to have the pre- proxy server 75 periodically send an empty SIP notify message to the media terminal adapter 40.
- the media terminal adapter 40 responds to this notify message in accordance with SIP standards by, for example sending an acknowledgement message.
- the Internet telephony regional data center 80 has the pre-proxy server 75 separated from the RTP relay 85. While this separation is not necessary to the present invention, in some environments is allows additional functionality to be more easily added to the pre- proxy server 75. An example of such additional functionality is the dynamic allocate allocation of the RTP relay 85.
- the pre-proxy server 75 can allocate the closest RTP relay between the two calling parties. That allocation enables the ability to decrease latency and travel time of the RTP stream.
- the RTP stream need not travel to the data center, and depending upon the location of the caller and the destination area 100, can travel within a limited geographic area.
- the telephone handset could be ocated in California, and the Internet telephony regional data center 80 could be located in New Jersey.
- the destination area 100 is also in Calrfomia, the Internet telephony point of presence in the destination area 90 would be allocated by the pre-proxy server 75 to also be in California.
- the RTP stream would remain in California; tending to reduce to decrease latency and travel time of the RTP stream.
- the pre-proxy server 75 is shown and discussed as a separate computer. This is for convenience of discussion, for purposes of practicing the invention, it does not neeito be separate. Instead, the discussed functions that typically would be implemented in a pre-proxy server can be implemented in a computer that is also functioning as a server.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04795031A EP1726140B1 (en) | 2003-10-15 | 2004-10-14 | Method and apparatus for enhanced internet telephony |
AT04795031T ATE540512T1 (en) | 2003-10-15 | 2004-10-14 | METHOD AND APPARATUS FOR ADVANCED INTERNET TELEPHONE |
CN2004800340173A CN1883179B (en) | 2003-10-15 | 2004-10-14 | Method and apparatus for enhanced internet telephone technology |
AU2004282932A AU2004282932B2 (en) | 2003-10-15 | 2004-10-14 | Method and apparatus for enhanced internet telephony |
CA2542421A CA2542421C (en) | 2003-10-15 | 2004-10-14 | Method and apparatus for enhanced internet telephony |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/684,593 | 2003-10-15 | ||
US10/684,593 US7417981B2 (en) | 2003-10-15 | 2003-10-15 | Method and apparatus for enhanced Internet Telephony |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005038594A2 true WO2005038594A2 (en) | 2005-04-28 |
WO2005038594A3 WO2005038594A3 (en) | 2005-11-17 |
Family
ID=34465459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/033812 WO2005038594A2 (en) | 2003-10-15 | 2004-10-14 | Method and apparatus for enhanced internet telephony |
Country Status (7)
Country | Link |
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US (3) | US7417981B2 (en) |
EP (2) | EP1726140B1 (en) |
CN (1) | CN1883179B (en) |
AT (1) | ATE540512T1 (en) |
AU (1) | AU2004282932B2 (en) |
CA (1) | CA2542421C (en) |
WO (1) | WO2005038594A2 (en) |
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- 2004-10-14 CN CN2004800340173A patent/CN1883179B/en not_active Expired - Fee Related
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EP1726140A2 (en) | 2006-11-29 |
EP1726140B1 (en) | 2012-01-04 |
US20050083908A1 (en) | 2005-04-21 |
CN1883179A (en) | 2006-12-20 |
CN1883179B (en) | 2010-06-09 |
US20080183892A1 (en) | 2008-07-31 |
CA2542421C (en) | 2014-12-02 |
EP2264978A1 (en) | 2010-12-22 |
AU2004282932A1 (en) | 2005-04-28 |
CA2542421A1 (en) | 2005-04-28 |
WO2005038594A3 (en) | 2005-11-17 |
US7924822B2 (en) | 2011-04-12 |
US20080181375A1 (en) | 2008-07-31 |
ATE540512T1 (en) | 2012-01-15 |
AU2004282932B2 (en) | 2009-11-05 |
US7417981B2 (en) | 2008-08-26 |
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