CA2364979A1 - Interworking of dissimilar packet networks for telephony communications - Google Patents

Interworking of dissimilar packet networks for telephony communications Download PDF

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Publication number
CA2364979A1
CA2364979A1 CA002364979A CA2364979A CA2364979A1 CA 2364979 A1 CA2364979 A1 CA 2364979A1 CA 002364979 A CA002364979 A CA 002364979A CA 2364979 A CA2364979 A CA 2364979A CA 2364979 A1 CA2364979 A1 CA 2364979A1
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Canada
Prior art keywords
pdus
broadband transport
protocol
broadband
data
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002364979A
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French (fr)
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CA2364979C (en
Inventor
Dany D. Sylvain
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rockstar Consortium US LP
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Nortel Networks Ltd
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Filing date
Publication date
Application filed by Nortel Networks Ltd filed Critical Nortel Networks Ltd
Priority to CA2734584A priority Critical patent/CA2734584C/en
Publication of CA2364979A1 publication Critical patent/CA2364979A1/en
Application granted granted Critical
Publication of CA2364979C publication Critical patent/CA2364979C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/06—Arrangements for interconnection between switching centres using auxiliary connections for control or supervision, e.g. where the auxiliary connection is a signalling system number 7 link
    • H04M7/063—Arrangements for interconnection between switching centres using auxiliary connections for control or supervision, e.g. where the auxiliary connection is a signalling system number 7 link where the telephone network is a network other than PSTN/ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0025—Provisions for signalling

Abstract

An Interworking Gateway enabled to provide continuous conversion of Protocol Data Units (PDUs) of any one of a provisioned set of transport protocols to any other member of the set is disclosed. Each transport protocol is associated with at least one transport protocol unit comprising at least one signaling port, at least one receive path, and at least one transmit path. Receive paths are adapted to convert PDUs of respective transport protocols into a base format, and transmit paths are adapted to convert a stream of base format data into PDUs of respective transport protocols. Transport protocol units are autonomous modules. The Interworking Gateway permits telephone services to extend across different broadband telephony networks in today's telecommunications system of networks.

Claims (22)

1. A method for providing conversion between Protocol Data Units (PDUs) conforming to a first transport protocol, and PDUs conforming to a second transport protocol, comprising steps of:
a) receiving PDUs conforming to the first transport protocol from a first broadband network;
b) extracting a content portion of each received PDU;
c) converting the content portion of the PDU into a data stream conforming to a base format;
d) converting the data stream in the base format into a PDU conforming to the second transport protocol; and e) transmitting the PDUs conforming to the second transport protocol to a second broadband network.
2. The method as claimed in claim 1 wherein the base format comprises Pulse Code Modulated (PCM) data.
3. The method as claimed in claim 1 further comprising a step of sequencing received PDUs with respect to sequencing data contained in headers of the received PDUs, prior to extracting respective content portions.
4. The method as claimed in claim 1 further comprising a step of decoding received PDUs prior to converting the content portions into the base format.
5. An interworking gateway for providing conversion among members of a provisioned set of broadband transport networks, comprising:
a) at least one receive path connected to each of the broadband transport networks, each receive path being adapted to receive protocol data units (PDUs) from a respective broadband transport network, extract a content of the PDUs, and convert the content to data in a base format;
b) at least one transmit path connected to each of the broadband transport networks, each transmit path being adapted to receive a stream of base format data from one of the at least one receive paths, convert the base format data into PDUs of a respective broadband transport network, and send the PDUs into the respective broadband network;
c) a switch for selectively connecting and disconnecting a one of the at least one receive paths to a one of the at least one transmit paths; and d) a controller for controlling the switch in response to connection setup messages received from the respective broadband transport networks.
6. An interworking gateway as claimed in claim 5, wherein the PDUs of the members of the provisioned set of broadband transport networks include: Real-time Transfer Protocol over Internet Protocol (RTP/IP) packets, Asynchronous Transfer Mode (ATM) Adaptation Layer 1 (AAL 1) cells, (ATM) Adaptation Layer 2 (AAL 2) cells and Frame Relay (FR) frames.
7. An interworking gateway as claimed in claim 5 wherein the base format is Pulse Code Modulated (PCM) data format.
8. An interworking gateway as claimed in claim 5, wherein each receive path comprises:
a) a receive buffer adapted to temporarily store PDUs received from the broadband transport network of the receive path; and b) a receive format adapter enabled to extract content from the received PDUs, and convert the content into the base format.
9. An interworking gateway as claimed in claim 8 wherein the receive format adapter comprises:
a) a decoder adapted to decode the payload data of the received PDUs, and pass the decoded payload data to a converter; and b) the converter is adapted to convert the payload data to the base format.
10. An interworking gateway as claimed in claim 9, wherein the decoder of a Real-time Transfer Protocol over Internet Protocol (RTP/IP) format adapter is adapted to decode the extracted payload data of the PDUs using a selected one of G.711, G.729 or G.726encoding methods .
11. An interworking gateway as claimed in claim 5, wherein the controller is adapted to exchange control messages with Media Gateways of each of the respective broadband transport networks.
12. An interworking gateway as claimed in claim 11 wherein the control messages conform to an H.248 control messaging protocol.
13. An interworking gateway as claimed in claim 11 wherein the controller is adapted to perform messaging functions of a Media Gateway in each of the provisioned set of broadband transport networks.
14. An interworking gateway as claimed in claim 5, wherein each transmit path comprises:
a) a transmit buffer adapted to temporarily store PDUs prior to transmission into the broadband transport network of the transmit path; and b) a transmit format adapter enabled to convert a stream of base format data into PDUs of the broadband transport network to which the transmit path is connected.
15. An interworking gateway as claimed in claim 14 wherein the transmit format adapter comprises:
a) an encoder adapted to encode the stream of base format data, and b) a PDU generator for generating PDUs in a protocol of the broadband transport network to which the transmit path is connected, and for inserting the encoded data as payload into the PDUs.
16. An interworking gateway as claimed in claim 15, wherein the encoder of a Real-time Transfer Protocol over Internet Protocol (RTP/IP) is adapted to encode the data stream in the base format using a selected one of G.711, G.729, or G.726voice encoding methods.
17. A method of establishing a communications session through an interworking gateway that provides interworking among a provisioned set of broadband transport networks, said method comprising steps of:
a) receiving from a Call Server (CS) connected to a first broadband transport network, a control message indicating a second broadband transport network, a first Signaling Correlation Tag (SCT) associated with the second broadband transport network, and a second SCT associated with the first broadband transport network;
b) associating with the first SCT both a receive path and a transmit path connected to the first broadband transport network;
c) associating with the second SCT both a receive path and a transmit path connected to the second broadband transport network;
d) interconnecting the receive path associated with the second SCT with the transmit path associated with the first SCT; and e) interconnecting the receive path associated with the first SCT with the transmit path associated with the second SCT.
18. A method as claimed in claim 17 wherein the control message conforms to H.248 control messaging protocol.
19. A method as claimed in claim 16 wherein the step of receiving the signaling message comprises steps of:
a) receiving from the CS, an Initial Address Advisory message providing an identifier of the second broadband transport network, the network address of a first Media Gateway in the second broadband transport network, and the first SCT;
and b) receiving from the CS a correlate message containing the first SCT and the second SCT.
20. A method as claimed in claim 19 further comprising a step of initiating a connection setup through the second broadband transport network in order to establish virtual trunk connection between the interworking gateway and the first media gateway.
21. A method as claimed in claim 19 further comprising steps of:
a) receiving from the second media gateway a connection setup message containing the second SCT, as well as a network address of the second media gateway; and b) transmitting a connect message through the first broadband transport network to the second media gateway.
22. A method as claimed in claim 17 wherein protocol data units (PDUs) respectively transported by the set of broadband transport networks comprise at least one of: Real-time Transfer Protocol over Internet Protocol (RTP/IP) packets, Asynchronous Transfer Mode ATM Adaptation Layer 1 (AAL 1) cells, ATM Adaptation Layer 2 (AAL 2) cells and Frame Relay (FR) frames.
CA2364979A 2000-12-21 2001-12-13 Interworking of dissimilar packet networks for telephony communications Expired - Fee Related CA2364979C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2734584A CA2734584C (en) 2000-12-21 2001-12-13 Interworking of dissimilar packet networks for telephony communications

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/741,041 US6819678B2 (en) 2000-12-21 2000-12-21 Interworking of dissimilar packet networks for telephony communications
US09/741,041 2000-12-21

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA2734584A Division CA2734584C (en) 2000-12-21 2001-12-13 Interworking of dissimilar packet networks for telephony communications

Publications (2)

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CA2364979A1 true CA2364979A1 (en) 2002-06-21
CA2364979C CA2364979C (en) 2011-06-21

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CA2364979A Expired - Fee Related CA2364979C (en) 2000-12-21 2001-12-13 Interworking of dissimilar packet networks for telephony communications
CA2870174A Abandoned CA2870174A1 (en) 2000-12-21 2001-12-13 Interworking of dissimilar packet networks for telephony communications
CA2734584A Expired - Fee Related CA2734584C (en) 2000-12-21 2001-12-13 Interworking of dissimilar packet networks for telephony communications

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CA2870174A Abandoned CA2870174A1 (en) 2000-12-21 2001-12-13 Interworking of dissimilar packet networks for telephony communications
CA2734584A Expired - Fee Related CA2734584C (en) 2000-12-21 2001-12-13 Interworking of dissimilar packet networks for telephony communications

Country Status (5)

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US (2) US6819678B2 (en)
EP (1) EP1217804B1 (en)
AU (1) AU783793B2 (en)
CA (3) CA2364979C (en)
DE (1) DE60115826T2 (en)

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Also Published As

Publication number Publication date
EP1217804B1 (en) 2005-12-14
CA2734584A1 (en) 2002-06-21
CA2734584C (en) 2015-02-03
DE60115826D1 (en) 2006-01-19
US6819678B2 (en) 2004-11-16
CA2364979C (en) 2011-06-21
EP1217804A3 (en) 2002-07-03
US20020080791A1 (en) 2002-06-27
AU783793B2 (en) 2005-12-08
DE60115826T2 (en) 2006-07-20
CA2870174A1 (en) 2002-06-21
AU9738801A (en) 2002-06-27
US7675934B2 (en) 2010-03-09
US20050047438A1 (en) 2005-03-03
EP1217804A2 (en) 2002-06-26

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