EP1714473A1 - Etablissement d'une liaison multimedia de transmission par paquets au moyen d'un systeme de reponse vocale interactif - Google Patents

Etablissement d'une liaison multimedia de transmission par paquets au moyen d'un systeme de reponse vocale interactif

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Publication number
EP1714473A1
EP1714473A1 EP05716643A EP05716643A EP1714473A1 EP 1714473 A1 EP1714473 A1 EP 1714473A1 EP 05716643 A EP05716643 A EP 05716643A EP 05716643 A EP05716643 A EP 05716643A EP 1714473 A1 EP1714473 A1 EP 1714473A1
Authority
EP
European Patent Office
Prior art keywords
subscriber
network
connection
ivr
oriented
Prior art date
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.)
Withdrawn
Application number
EP05716643A
Other languages
German (de)
English (en)
Inventor
Klaus Hoffmann
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.)
HMD Global Oy
Original Assignee
Siemens AG
Nokia Siemens Networks GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG, Nokia Siemens Networks GmbH and Co KG filed Critical Siemens AG
Publication of EP1714473A1 publication Critical patent/EP1714473A1/fr
Withdrawn legal-status Critical Current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
    • H04M7/006—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

Definitions

  • Line-oriented networks also called voice networks, telephone networks or Public Switched Telephone Network (PSTN) - are designed for the transmission of continuously flowing (voice) information, referred to in the technical field as (voice) connection, conversation or call.
  • the information is usually transmitted with high quality of service and security.
  • a minimal - e.g. ⁇ 200 ms - Delay without fluctuations in the delay time (delay jitter) is important, since speech requires a continuous flow of information when played back in the receiving device.
  • a loss of information cannot therefore be compensated for by retransmitting the non-transmitted information and usually leads to acoustically perceptible disturbances in the receiving device (e.g. crackling, distortion, echo, silence).
  • the transmission of speech is also generally referred to as real-time (transmission) service or as real-time service.
  • Packet-oriented networks - also called data networks - are designed for the transmission of packet streams, which are also referred to in the technical field as data packet streams, session or flow.
  • a high level of service usually does not have to be guaranteed here become.
  • the transmission of the data packet streams takes place, for example, with delays that fluctuate over time, since the individual data packets of the data packet streams are usually transmitted in the order in which they are accessed by the network, ie the more packets to be transmitted from a data network, the greater the time delays.
  • the transmission of data is therefore also referred to as a transmission service without real-time conditions or as a non-real-time service.
  • the packets usually differ depending on the type of packet-oriented network. For example, they can be configured as Internet, X.25 or frame relay packets, but also as ATM cells. They are sometimes referred to as news, especially then when a message is delivered in a packet.
  • the Internet is a well-known data network. Because of the Internet protocol IP used there, this is sometimes also called the IP network, although this term is to be understood broadly and includes all networks in which the IP protocol is used.
  • IP Internet protocol
  • the Internet is designed as an open (wide area) data network with open interfaces for connecting (mostly local and regional) data networks from different manufacturers. It provides a transport platform that is independent of the manufacturer.
  • Connections are communication relationships between at least two participants for the purpose of a - mostly mutual, ie bi-directional - information transfer.
  • the participant initiating the connection is usually referred to as an 'A participant'.
  • a subscriber connected through an A-subscriber is called a 'B-subscriber'.
  • connections also represent clear paths through the network on a physical level, along which the information is transmitted.
  • Signaling is used to coordinate network components with one another, but not for the "actual" transmission of information in the above sense.
  • the information transmitted for signaling is usually referred to as signaling information, signaling data or simply signaling.
  • the term is to be understood broadly. For example, also includes the messages for the control of registration, admission and status (RAS), the messages for the control of user channels of existing calls (e.g. in accordance with the H.245 standard) and all other similarly designed messages.
  • the "actual information” is also called user information, payload, media information, media data or simply media to distinguish it from the signaling.
  • Communication relationships leading to. Serving transmission of the signaling are also referred to below as signaling connections.
  • the communication relationships used to transmit the user information are e.g. Speech connection, user channel connection or - simplified - user channel, bearer channel or simply called bearer.
  • out-of-band or outband means the transmission of information in a different way / medium than that provided in the communication network for the transmission of signaling and useful information.
  • this includes a local configuration of devices on site, which e.g. is done with a local control facility.
  • in-band at in-band
  • voice transmission services and increasingly also broadband services such as Transmission of moving picture information also implemented in packet-oriented networks, i.e.
  • the transmission of the real-time services which have hitherto usually been line-oriented is carried out in a convergent network - also called voice-data network or multimedia network - in a packet-oriented manner, i.e. in packet streams.
  • Realtime packet streams called.
  • the transmission of voice information over a packet-oriented IP network is also identified with 'VoIP' (Voice over IP).
  • the basic standard H.323, Defines the transport of voice, data and video streams over an IP network. Audio and video streams are transmitted in accordance with the RTP / RTCP protocol. The connection control is caused by the H.225 protocol, which enables the signaling, registration and synchronization of media streams.
  • the H.323 architecture primarily provides the following types of functional units:
  • - terminal e.g. a terminal in a Local Area Network (LAN), for bi-directional real-time communication with other end devices, gatekeeper for performing the connection control,
  • LAN Local Area Network
  • MSC Media gateway controller
  • Session Description Protocol SDP
  • RFC2327 RFC2327
  • IP address of the Bearer Connection RTP / UDP port of the Bearer Connection (depending on whether there is voice or data transmission) Codec (s) that can (can) be used for voice or data transmission
  • a SIP proxy server can be used for a connection setup, for example if the connected endpoints do not know each other. It can also be designed to evaluate, change and / or forward a received request for a client (eg an IP telephone, a PC or a PDA).
  • MG and MGC are also provided at the interface to other networks.
  • the MGCP protocol Media Gateway Control Protocol
  • the MGCP protocol is used to control the MG. bindings, using the H.248 protocol and for converting between different signaling protocols.
  • Session Description Protocol SDP
  • RFC2327 RFC2327
  • IP address of the Bearer Connection RTP / UDP port of the Bearer Connection (depending on whether there is a voice or data transmission) Codec (s) that can be used for voice or data transmission Stream mode of the Bearer Connection
  • a SIP proxy server can be used for a connection setup, for example if the connected endpoints do not know each other. It can also be designed to evaluate, change and / or forward a received request for a client (eg an IP telephone, a PC or a PDA).
  • MG and MGC are also provided at the interface to other networks.
  • the MGCP protocol Media Gateway Control Protocol
  • the MGCP protocol is used to control the MG. It is common to both architectures that the connection control level and the resource control level are functionally clearly separated from each other and are usually even implemented on different hardware platforms.
  • connection control level is used for the controlled activation, control and deactivation of network services.
  • it can include dedicated connection controllers, to which the following functions can be assigned: - Address translation: conversion of E.164 telephone numbers and other alias addresses (e.g. computer names) to transport addresses (e.g. Internet addresses).
  • - Admission control check whether and / or to what extent use of the communication network is permitted.
  • - Alias Address Modification Return of a modified alias address, which is used by endpoints e.g. be used to establish a connection.
  • Bandwidth Control Management of transmission capacities, for example by controlling the permissible number of devices that can use the communication network at the same time - ⁇ .
  • Connection authorization admissibility check for incoming and outgoing connection requests.
  • Connection control signaling switching and / or processing of signaling messages.
  • Dialed Digit Translation Translation of the dialed digits into an E.164 telephone number or a number from a private numbering scheme.
  • connection controllers are those from the ITU in the H.323 gatekeeper or the SIP proxy.
  • the Resource Control level is used for the regulated implementation of activated services.
  • To control network resources e.g. transmission nodes, it can include resource controllers, to which the following functions can be assigned: - Capacity Control: Control of the volume of traffic fed to the communication network, for example by checking and possibly limiting the permissible transmission capacity of individual packet streams.
  • Priority management Preferred transmission of priority traffic flows, e.g. with the help of priority indicators, which are provided in priority packets.
  • a separate connection controller can be provided in each domain.
  • a domain can also be operated without a connection controller. If several connection controllers are provided in a domain, only one of them should be activated. From a logical point of view, a connection controller should be seen separately from the facilities. Physically, however, it does not have to be implemented in a separate connection controller device, but can also be implemented in each end point of a connection (for example in the form of an H.323 or SIP terminal, media gateway, multipoint control unit) or in a primarily for program-controlled data processing Device (for example: computer, PC, server) can be provided. A physically distributed implementation is also possible.
  • connection controller is a media gateway controller, to which the optional functions connection control signaling and connection management are usually assigned. Furthermore, the assignment of a signaling conversion function to implement different (signaling) protocols is conceivable, for example in the Boundary of two different networks, which are combined to form a hybrid network, may be required.
  • the resource controller is also known as a 'Policy Decision Point (PDP)'. It is implemented, for example, within so-called edge routers - also called edge devices, access nodes or, when assigned to an Internet service provider (ISP), also called provider edge routers (PER). These edge routers can also be designed as media gateways to other networks to which the multimedia networks are connected. These media gateways are then connected both to a multimedia network and to the other networks and are used internally for the implementation between the different (transmission) protocols of the different networks.
  • the resource controller can also be designed only as a proxy and forward information relevant to the resource controller to a separate device on which the relevant information is processed in accordance with a function of the resource controller.
  • connection controller Connection Controller Routed Signaling - CCRS
  • DERS Direct Endpoint Routed Signaling - DERS
  • all signaling messages are transmitted by at least one call controller. All facilities send and receive signaling messages only via the call controller. A direct exchange of signaling messages between the facilities is prohibited.
  • connection controller With DERS, copies of selected signaling messages can be transmitted to the connection controller, so that a connection controller also has knowledge of the connections between the end devices in this variant can. However, these connections are not actively influenced or verified by himself.
  • the function split between the two levels can be described in such a way that the resource control level is assigned only the functions that are required for the transmission of useful information, while the connection control level includes the intelligence for controlling the resource control level.
  • the facilities at the resource control level have as little network control intelligence as possible and can subsequently be implemented in an economically particularly advantageous manner on separate hardware platforms. This is a particularly nice advantage because of the higher number of installations in this level compared to the connection control level.
  • Interworking between two different protocols can be effected indirectly or directly.
  • indirect interworking a further, third protocol is switched between the two protocols - for example the protocol BICC (Bearer Independent Call Control) according to the Standard Q.1902 or the SIP_T protocol (SIP for Telephones), which is described in the RFC3372 standard.
  • SIP_T protocol SIP for Telephones
  • the invention is based on the knowledge that during the evolution of hybrid networks which result from the interconnection of proven line-oriented networks with modern multimedia networks, many of the performance features which have long been established in line-oriented networks do not or at least not be fully supported.
  • the invention is based on the knowledge that the differentiated specifications for bearer handling in the different PSTN networks and multimedia networks do not match. For example, in PSTN networks and H.323 networks the partner is signaled that their own sending direction is blocked, while in SIP networks the partner is signaled that the partner is (from the point of view of the signaling party) remote
  • Transmission direction has to be interrupted, since in SIP networks only the own transmission direction, but not the own reception direction, is separated and thus each SIP subscriber suppresses his own transmission direction himself by deactivating his transmitter.
  • some signal tones such as the ringback, are generated at the B subscriber in PSTN networks and transmitted through the network to the A subscriber, while in multimedia networks the beep should preferably only be generated at the A subscriber.
  • these divergences mean that the intelligent network services of the PSTN network, such as the prepaid services - also called Interactive Voice Response IVR - have to be integrated into the complex structure of the growing networks when used in a packet-oriented multimedia network. According to the knowledge of the invention, it is no longer possible to transmit ringback tones across the packet-oriented multimedia networks as before. According to the knowledge of the invention, it is also undesirable to permanently connect the connections established with the aid of IVR systems via the IVR systems.
  • the IVR service is currently standardized at the IETF. In the previous draft standard draft-ietf.sipping-3pcc-03.txt, however, there is no reference to the findings of the invention. The problem of ringback tones is not discussed. As a result, this function is currently lost if the B subscribers are assigned to the multimedia network and therefore do not feed ringback tones into the payload stream.
  • a ringback By announcing the ringing to the B subscriber, a ringback can be displayed to the A subscriber.
  • the A-subscriber is only shown the ringback if there is actually ringing at the B-subscriber.
  • the simulation solution is no longer prone to errors. The solution is therefore acceptable from the operator's point of view and can also be offered commercially.
  • the line-oriented terminals can continue to be used unchanged. This is the nice advantage of a seamless connection of the two networks to form a hybrid overall network.
  • the method can be optimally used on devices with a display, e.g. Computers, mobile phones, etc. can be customized.
  • FIG. 1 shows an exemplary arrangement for carrying out the method according to the invention with a hybrid communication network, consisting of two packet-oriented multimedia networks and a line-oriented voice network, which are connected by intermediary media gateways, media gateway controllers and SIP proxies, and one end point each common features in each of the three networks
  • FIG. 1 shows an exemplary arrangement for carrying out the method according to the invention. It comprises a line-oriented network PSTN A and two multimedia networks IN B and IN I VR, which are preferably designed as integrated voice-data networks SDN.
  • the PSTN A , IN B and IN 1VR networks are combined to form a hybrid network.
  • the networks are IN
  • IP networks 13 preferably designed as IP networks and each include a SIP proxy SP B or SPIVR as a call controller.
  • SIP proxy SP B or SPIVR as a call controller.
  • the invention can of course be used in any packet-oriented networks IN, such as, for example, the Internet, intranet, extranet, H.323 network with a gatekeeper as a call controller, a local area network (LAN) or a company internal network (Corporate Network), for example, a Virtual Private Network (VPN).
  • LAN local area network
  • Coreporate Network for example, a Virtual Private Network (VPN).
  • VPN Virtual Private Network
  • a subscriber A is connected to the network PSTN A using a conventional telephone T and to the network IN B a subscriber B using a SIP-capable telephone, for example a SIP client SC implemented in software.
  • An Interactive Voice Response System IVR is assigned to the IN IVR network.
  • a first connection is provided between subscriber A and the IVR system, which comprises a bearer an end-to-end user channel TDM, RTP / RTCP A / IVR .
  • a second connection is provided between the system IVR and subscriber B, which acts as a bearer, an end-to-end user channel
  • RTP / RTCP I VR / B includes. Finally, a direct connection is provided between subscriber A and B, which as bearer comprises an end-to-end user channel TDM, RTP / RTCP A / B.
  • the combination of the line-oriented Bearer TDM with the packet-oriented Bearer RTP / RTCP is done by an intermediate Media Gateway MG for conversion between different, network-specific user channel technologies RTP / RTCP (Real Time [Control] Protocol) and TDM (Time Deviation Multiplex), the connection the signaling SS7 of the network PSTN with the signaling SIP of the networks IN is effected by interposed media gateway controllers MGC A / B and MGC I VR.
  • the controller MGC A / B effects direct interworking between the different network-specific signaling protocols ISUP of the network PSTN and SIP B of the network IN B.
  • a BICC or SIP_T protocol is used between the MGC A / B and MGC I VR controllers
  • the gateway MG is controlled by the controller MGC A / B assigned to it by a - preferably internationally standardized - protocol, for example MGCP (Media Gateway Control Protocol) or H.248. It is usually implemented as a separate unit which runs on a different physical device / hardware platform than the MGC AB controller assigned to it.
  • MGCP Media Gateway Control Protocol
  • H.248 Media Gateway Control Protocol
  • a first connection TDM, RTP / RTCP A / IR is set up between subscriber A and the system IVR, which is assigned to the packet-oriented network IN IV R. Because subscriber A is assigned to the line-oriented network PSTN, its line-oriented signaling ISUP is mapped to the packet-oriented signaling SIP and SIP_T and its line-oriented bearer TDM is mapped to the packet-oriented bearer during the transition between the networks
  • the first connection set up in this way comprises at least one bearer TDM, RTP / RTCP IVR (usually bidirectional in a telephone conversation) for transmitting information between subscriber A and the system IVR.
  • the system IVR is informed by subscriber A of the data required for authenticating subscriber A and for identifying subscriber B.
  • subscriber A transmits a passcode and the subscriber B's number on the bearer TDM, RTP / RTCP A / IVR .
  • the second connection RTP IVR / B to subscriber B is set up by the system IVR using the communicated data. This leads to a ringing being displayed for the B-subscriber. This is communicated to the IVR system.
  • the system IVR then sends a first signaling message to subscriber A. After receiving this message, subscriber A is informed of the ringing at subscriber B using a ringback.
  • subscriber A is assigned to network PSTN, so that the transmission of a ringback tone is desirable.
  • This ringback tone is preferably generated in the media gateway MG.
  • the first signaling message is received by the media gateway controller MGC A / B and translated by the latter into an instruction for generating the ringback tone, which is transmitted to the media gateway MG using the MGCP protocol.
  • the ringback tone could also be transmitted directly by the IVR system instead of the first signaling message, provided the IVR system knows which network type subscriber A is assigned to. This could be known, for example, on the basis of fixed default settings
  • subscriber A As soon as subscriber B accepts the established connection, subscriber A is informed of this with the aid of a second signaling message. This is also received by the Media Gateway Controller MGC A / B and translated into an instruction to switch off the ringback tone, which is transmitted to the Media Gateway MG using the MGCP protocol. In the alternative embodiment, the ringback tone would be switched off immediately by the IVR system. This ends the ringback for subscriber A. In this way, ringback and ringing are consistently coordinated.
  • the two connections TDM, RTP / RTCP A / IVR and RTP / RTCPIVR / B in the packet-oriented network IN are advantageously switched to a direct connection TDM, RTP / RTCP A / B.
  • This is achieved, for example, by transmitting the IP addresses of subscribers A, B in the relevant messages.
  • the.IP addresses could be transmitted in SIP messages INVITE, re-INVITE, 180 RINGING, 200 OK or ACK and there in matching SDP attributes.
  • the sender of the second signaling message depends on when the two connections are switched to a direct connection. If it occurs rather early at the start of establishing the second connection, the sender is ⁇ probably immediate subscriber B. If it occurs rather late, the immediate sender is more the IVR system, which previously received a corresponding (indirect) message from subscriber B - eg a SIP message 200 OK - has been communicated.
  • NGN Next Generation Network
  • VoDSL Voice over Digital Subscriber Line
  • H323 Voice over Digital Subscriber Line
  • All functional units can in particular be partially or completely implemented in software / computer program products P and / or distributed over several physical devices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Telephonic Communication Services (AREA)

Abstract

Une communication est établie entre des abonnés (A, B) au moyen d'un système de réponse vocale interactif (RVI). La génération d'un rappel de l'abonné (A) est commandée par des messages de signalisation servant à avertir l'abonné (B) d'un appel. Une liaison directe TDM, RTP/RTCPA/B dans le réseau multimédia (IN) est mise en place entre les deux abonnés (A, B) au plus tard lorsque la communication est établie. Il est ainsi possible de proposer la caractéristique de puissance de réseau intelligent RVI du réseau de puissance PSTN dans un réseau multimédia (IN) de transmission par paquets, de sorte qu'un rappel y est affiché correctement. La liaison directe TDM, RTP/RTCPA/B permet en outre de décharger le système RVI de manière notable.
EP05716643A 2004-02-11 2005-02-08 Etablissement d'une liaison multimedia de transmission par paquets au moyen d'un systeme de reponse vocale interactif Withdrawn EP1714473A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004006756A DE102004006756B4 (de) 2004-02-11 2004-02-11 Aufbau einer paketorientierten Multimediaverbindung unter Mitwirkung eines Interactive Voice Response Systems
PCT/EP2005/050532 WO2005079049A1 (fr) 2004-02-11 2005-02-08 Etablissement d'une liaison multimedia de transmission par paquets au moyen d'un systeme de reponse vocale interactif

Publications (1)

Publication Number Publication Date
EP1714473A1 true EP1714473A1 (fr) 2006-10-25

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EP05716643A Withdrawn EP1714473A1 (fr) 2004-02-11 2005-02-08 Etablissement d'une liaison multimedia de transmission par paquets au moyen d'un systeme de reponse vocale interactif

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Country Link
US (1) US20070172051A1 (fr)
EP (1) EP1714473A1 (fr)
CN (1) CN1918892A (fr)
DE (1) DE102004006756B4 (fr)
WO (1) WO2005079049A1 (fr)

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Publication number Publication date
US20070172051A1 (en) 2007-07-26
DE102004006756B4 (de) 2005-12-29
CN1918892A (zh) 2007-02-21
WO2005079049A1 (fr) 2005-08-25
DE102004006756A1 (de) 2005-09-08

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