WO2002100119A1 - Method and apparatus for setting up a connection by means of a call back function of a voice mail service and a voice mail system provided with a call back function for setting up a connection - Google Patents

Method and apparatus for setting up a connection by means of a call back function of a voice mail service and a voice mail system provided with a call back function for setting up a connection Download PDF

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Publication number
WO2002100119A1
WO2002100119A1 PCT/FI2002/000481 FI0200481W WO02100119A1 WO 2002100119 A1 WO2002100119 A1 WO 2002100119A1 FI 0200481 W FI0200481 W FI 0200481W WO 02100119 A1 WO02100119 A1 WO 02100119A1
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WO
WIPO (PCT)
Prior art keywords
subscriber
voice mail
connection
call
scp
Prior art date
Application number
PCT/FI2002/000481
Other languages
French (fr)
Inventor
Hannu Peltola
Markku Laihonen
Original Assignee
Elisa Communications Oyj
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 Elisa Communications Oyj filed Critical Elisa Communications Oyj
Publication of WO2002100119A1 publication Critical patent/WO2002100119A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42195—Arrangements for calling back a calling subscriber
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/50—Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers ; Centralised arrangements for recording messages
    • H04M3/53—Centralised arrangements for recording incoming messages, i.e. mailbox systems
    • H04M3/533—Voice mail systems
    • H04M3/53333—Message receiving aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0029—Provisions for intelligent networking
    • H04Q3/0037—Provisions for intelligent networking involving call modelling techniques, e.g. modifications to the basic call state model [BCSM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2207/00—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place
    • H04M2207/12—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place intelligent networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13003—Constructional details of switching devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13034—A/D conversion, code compression/expansion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1305—Software aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1307—Call setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13152—Callback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13176—Common channel signaling, CCS7
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13345—Intelligent networks, SCP
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13377—Recorded announcement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13389—LAN, internet

Definitions

  • the present invention relates to telecommunications and voice mail service.
  • the object of the present invention is a method according to the preamble of Claim 1 and an apparatus according to the preamble of Claim 5 for setting up a connection in telecommunications network by means of a call back function of a voice mail service and a voice mail system with a call back function according to the preamble of Claim 6 for setting up a connection.
  • intelligent network includes at least one lower-level service switching point SSP which is in communication with telecommunications network exchange, and with which at least one intelligent peripheral (IP) device and a higher level service control point (SCP) controlling the service switching point (SSP) or SSP group are in communication.
  • SSP service switching point
  • IP intelligent peripheral
  • SCP service control point
  • telecommunications network As caller or subscriber A dials subscriber B's call number or subscriber number, it activates a connecting phase, at which time the voice mail service is activated when: subscriber B's line is inactive; subscriber B's line does not answer the call of subscriber A; or connecting control information has been stored in the telecommunications network for forwarding incoming calls for subscriber B into subscriber B's voice mail service.
  • Voice mail service is already known as a network service provided by network operator, when the users of voice mail service are typically in communication with rVR (Interactive Voice Response) equipment arranged into telecommunications network, in which functions a voice mail server or application, that is, VMS (Voice Message Server) which produces the voice mail service, the user-specified settings of which the user may control with commands given from a terminal, which are typically tone frequency or dual-tone multi frequency (DTMF) signals or voice commands.
  • VMS Voice Message Server
  • DTMF dual-tone multi frequency
  • the original subscriber line B has forwarded the incoming calls meant for it into an answering service, when the direct call set-up chain from subscriber A over telecommunications network to subscriber B's line is cut off, and the identifying information of subscriber A is not conveyed into subscriber B's line to be utilised in calling setup.
  • subscriber B retrieves the messages in the voice mail service, subscriber B only hears the messages, and the requested communication with the senders of the messages is typically based only on the heard contact information.
  • the call back function related to answering service or message is essentially already known only as a feature arranged for a telecommunications network terminal and/or separate answering device.
  • CLI calling line identification
  • signalling information field such as in OPC (Originating Point Code)
  • OPC Oil Point Code
  • a call back function is arranged into the application logic of a voice mail service provided as network service, the VMS of which is connected to telecommunications network exchange, this call back function would be based on message information stored in voice mail service database, which information includes the identifying information of the message sender, subscriber line A, then the call back connection being set up is first routed from subscriber line B to telecommunications network exchange, then from telecommunications network exchange to voice mail service VMS, and back from VMS to telecommunications network exchange, and finally via telecommunications network exchange(s) to subscriber line A.
  • connection makes an unnecessary detour from telephone exchange via VMS back to telecommunications network telephone exchange, and that the connection routed unnecessary via VMS remains on for the time of the whole B-to-A connection, and unnecessarily reserves connection resources.
  • VMS voice mail server is in communication with IN network's SSP (Service
  • the voice mail server sends an ISUP retrieval message, which includes the caller identification of the message sender, to SSP which then sends a TCAP (Transaction Capabilities Application Part) message to IN network's SCP (Service Control Point), which analyses the TCAP message and disconnects the voice mail service user's connection with voice mail server and directs SSP to set up a connection from the voice mail user to the sender of the message.
  • TCAP Transaction Capabilities Application Part
  • IN network's SCP Service Control Point
  • SCP Service Control Point
  • the call back connection is set up from SSP to the sender of the message via an IP (Intelligent Peripheral) device which monitors the disconnecting of call back connection and which communicates via voice mail telephone network.
  • IP Intelligent Peripheral
  • the primary object of the invention is to reduce the need for writing down or memorising telephone numbers, and thus improve and speed up the voice mail service, particularly the object is to accomplish a new and inventive method, apparatus and system for setting up a connection in telecommunications network by means of a call back function of a voice mail service, in order to significantly increase the usability of a voice mail service, for example, when driving a car, and to speed up and secure the call back phone call set-up to the message sender, subscriber A's, line.
  • the invention is generally based on the idea that a logic INAP (Intelligent Network Application Protocol) connection is set up between the TN network's IP device, which includes or is connected to the VMS, and the SCP by means of the SCP, that after the voice mail service user has informed the VMS of wishing to answer with the call back function to the message sender, first a connection is set up from line B to the VMS via the IP device, with the IP application of which the connecting control is temporarily transferred to the VMS, when an INAP (Intelligent Network Application Protocol) connection is set up via the IP device between telecommunications network and the VMS, and that by means of INAP connection, a connection from subscriber B's line to subscriber A's line is set up by means of caller identification signalled into the VMS when the message was sent, at the same time that the connection from the SSP to the IP device and the VMS is disconnected.
  • INAP Intelligent Network Application Protocol
  • the call back connection from the voice mail service user's or subscriber B's line to the message sender's, subscriber A's line is set up in the following way: a call is made from the voice mail service user's or the subscriber B's line to voice mail service,
  • the call is routed to the IN network via the SSP, - the SSP queries routing information from the SCP,
  • the SCP commands the SSP to route the call to the IP device
  • the SCP sets up the logic INAP connection between the SCP and the IP device via the SSP,
  • control part and service are activated in the IP device, when the call is routed to the IP device,
  • the IP device which includes or is connected to the VMS, transfers the call to the VMS
  • the subscriber B hears from the voice mail application or server if any messages were left, - the subscriber B controls the VMS voice mail application or voice mail server, advantageously with voice control or DTMF signals,
  • the subscriber B tells the VMS of wishing to set up an answer call for the sender of the message with call back function
  • connection is set up from the subscriber B's line to the subscriber A's line based on the caller information signalled to the VMS when the message was sent, and the connection from the SSP to the IP device and the VMS is disconnected.
  • FIG. 1 illustrates a simplified system for implementing a voice mail service in telecommunications network according to known prior art
  • FIG. 2 illustrates a system according to a certain advantageous embodiment of the invention for implementmg a voice mail service according to the invention, in which the IP device producing the voice mail service includes a software-based control part and voice mail application
  • the IP device producing the voice mail service includes a software-based control part and voice mail application
  • FIG: 3 illustrates another certain advantageous embodiment of the invention, in which the IP device producing the voice mail service is connected to a physical voice mail server part, and
  • FIG. 4 illustrates the invention as program flow chart and flow diagram.
  • Telecommunications network which is connected to intelligent network 4, 5, 6, or IN network, and which is, for instance, a fixed circuit-switched PSTN (Public Switched Telecommunication Network) network or a digital PLMN (Public Land Mobile Network) network which applies TDM and/or CDM channelling or a combination of such networks, which will hereinafter be referred to as telecommunications network for simplicity.
  • Telecommunications network which is connected to an IN network, comprises typically of:
  • terminals of telecommunications network which are at least the calling line or subscriber A's 1 line and the target line or subscriber B's 2 line;
  • the first, for example national or international, telephone exchange 7 which is connected to subscriber A's 1 line and via which subscriber A is in communication with IN part's SSP 5, and
  • the second, also for example national or international, telephone exchange 8 which is connected to subscriber B's 2 line and via which subscriber B 2 is in communication with IN part's SSP 5.
  • subscriber A's and subscriber B's 1 and 2 lines may also be located only in the area of the first telephone exchange 7 or the second telephone exchange 8. Thus, one of these telephone exchanges is unnecessary from the point of view of connection, connecting, message sending and message retrieving, because subscriber A 1 and subscriber B 2 are connected to one telephone exchange 7 or 8.
  • the voice mail service is accomplished with voice mail server 9, which is connected to telecommunications network telephone exchange 8.
  • voice mail servers 9 are connected to hierarchically higher-level district and national or international telephone exchanges in order to accomplish a centralised voice mail service, and respectively, voice mail servers 9 are arranged to lower-level local and district exchanges in order to accomplish a distributed voice mail service.
  • the voice mail server 9 is in communication with one telephone exchange which is a national or international telephone exchange 8 of telecommunications network.
  • connectionless CCS signalling (Common Channel Signalling), which is based on SS7 (Signalling System 7) signalling according to ITU-T recommendations, has been arranged between network elements.
  • Signalling may also be CAS signalling (Channel Associated Signalling) with connection, when the signals are transmitted in a voice channel.
  • CCS signalling When CCS signalling is utilised in a telecommunications network provided with IN network: - subscriber A's 1 line, the first telephone exchange 7, lower-level SSP 5 of intelligent network part, the second telephone exchange 8, subscriber B's 2 line and VMS 3 employ ISUP protocol or TUP (Telephony User Part) protocol above the third layer of SS7 protocol stack according to OSI model for implementing telecommunications and data transmission between these parts, - intelligent network part's SSP 5, SCP 4 and IP (Intelligent Peripheral) device 6 are each equipment employing INAP (Intelligent Network Application Part) protocol of the seventh layer of SS7 protocol stack according to OSI model from the point of view of telecommunications and data transmission.
  • INAP Intelligent Network Application Part
  • FIGS 2 and 3 which illustrate voice mail systems in PSTN and/or PLMN network according to the first and second advantageous embodiments of the invention, in which both the first and second telephone exchanges 7, 8 are connected to IN network's SSP 4, and in which the first telephone exchange 7 is connected to calling subscriber A's 1 line(s), and in which the second telephone exchange is connected to subscriber B's 2 line(s) employing voice mail service.
  • the voice mail service is accomplished with software by means of a voice mail application 91 which is included or is connected to the IP application in IP device 6.
  • the voice mail service is accomplished with a physical voice mail server 92 which is in data transmission communication with IN network's intelligent peripheral or IP device 6.
  • the IP device 6 is in data transmission communication with IN network's SSP 5 which is in data transmission communication with IN network's SCP 4.
  • SSP 5, SCP 4 and IP device 6 are each known per se equipment employing INAP protocol from the point of view of data transmission.
  • INAP protocol between IN network's SCP 4 and IP device 6 via SSP 5 in the voice mail service according to the invention.
  • a connection is set up in the method, system and with the computer program from the voice mail service user's or subscriber B's 2 line to telephone exchange 7 or 8 and via IN network's SSP 5 to
  • IP device 6 which includes or is connected to: - in the embodiment illustrated in Figure 2, a software-based voice mail application 91, when in order to produce a voice mail service and call back function of the voice mail service and to control and implement their different phases, the software-based control part 11 included in the IP device 6 communicates with the software-based voice mail application 91 included in or connected to the IVR part 10, or
  • a physical voice mail server 92 when also the IP device 6 is a physical device and both IVR part 10 and TP device 6 are equipped with, for example, integrated logic circuits in order to accomplish a voice mail service and a call back function of a voice mail service and to control and implement their different phases.
  • the voice mail application 91 according to the first embodiment of the invention which is advantageously included in IVR part's 10 IVR application
  • the physical voice mail server 92 according to the second embodiment of the invention which is connected to IP device 6 and which includes logic equivalent to the IVR part's voice mail application, do not essentially differ from each other.
  • the dialled call is routed to the voice mail service, and the logic of the voice mail application stores the identifying information and or message of subscriber A's line 1 into the voice mail service database, when
  • the voice mail service functions in the following way:
  • SCP 4 sets up a logic data transmission connection using INAP protocol between SCP 4 and TP device 6 via SSP 5,
  • the IP device 6 transfers the call to the voice mail application 91 or voice mail server 92, which is or is connected to IVR part 10, - subscriber B 2 hears from the voice mail application 91 or voice mail server 92 if any messages were left,
  • - subscriber B 2 controls the voice mail application 91 or server 92 with either voice control or DTMF signals
  • - subscriber B 2 tells voice mail application 91 or voice mail server 92 of wishing to set up a call back connection to the sender of the message.
  • a connection is set up by means of the call back function from subscriber B's 2 line to subscriber A's 1 line based on the caller information signalled into voice mail application 91 or server 92 when subscriber A left the message, and the unnecessary connection via SSP 5 and TP device 6 to voice mail application 91 or voice mail server 92 is disconnected.
  • the IP application transfers the call control occasionally to IVR part 10, which may be a part of the IP application of the IP device 6 or which may be located as a separate IVR application in the IP device 6, signalling according to INAP protocol may be produced between telecommunications network and IVR part 10 or fVR application via SSP 5 by means of SCP 4 and IP device, which signalling enables setting up a new connection so that the unnecessary connection between TN network's SSP 5 and IP device 6 and IVR part 10 or IVR application may be disconnected, and to set up a new call from the voice mail service or voice mail application 91 or voice mail server 92 user, subscriber line B 2, via telecommunications network exchange or centres 7, 8 to the subscriber line A 1 who left the message.
  • IVR part 10 may be a part of the IP application of the IP device 6 or which may be located as a separate IVR application in the IP device 6
  • signalling according to INAP protocol may be produced between telecommunications network and IVR part 10 or fVR application via SSP 5 by means of
  • SCP 4 when SCP 4 sets up a logic connection using INAP protocol between SCP 4 and IP device 6, SCP 4 at the same time commands SSP 5 to route the call using ISUP protocol to IP device 6, when a talking connection is set up from the caller, that is, voice mail application 91 or server 92 user to the IP device.
  • the IP device 6 After the IP device 6 has received from SCP 4 an INAP message, advantageously the message "PromptAndCollectUser- Information", within which is sent the announcement number which the IP device 6 should dial.
  • the control part 11 included in or connected to the IP device 6 detects that the announcement number in question means that the control of call is transferred to voice mail server 92 or application 91.
  • the IP device 6 is not activated to function according to the specifications of ETSI (The European Telecommunications Standards Institute) only to play the announcement and possibly receive DTMF (Dual Tone Multi Frequency) signals and to acknowledge successful function to SCP with an INAP message, advantageously with the message "PromptAndCollectUserlnformation- Result”.
  • ETSI European Telecommunications Standards Institute
  • DTMF Double Tone Multi Frequency
  • the voice mail server 92 or application 91 is accomplished to function according to the invention like there was no IP device 6 in between. Then, when the voice mail server 92 or application 91 user activates the call back function with DTMF or voice control, the voice mail server 92 or application 91 cuts off its own speech processing process and transfers the control of call to the IP device 6 with a certain manner defined in advance.
  • This manner defined in advance may be, for example: • when the call back function is activated, the voice mail server 92 or application 91 informs the IP device 6 (for the ongoing process of the same call) to "direct to number ABCDEFG", that is, the subscriber number of subscriber line A 1, in which A-G are advantageously hexa numbers, each between 0-F;
  • the information is advantageously transferred software-based inside the computer from the voice mail server 92 or application 91 process to the P device 6 call control process, or externally by means of a suitable data transmission connection, for example, TCP/IP (Transmission Control Protocol/Internet Protocol) connection;
  • TCP/IP Transmission Control Protocol/Internet Protocol
  • the IP device 6 sends SCP 4 an INAP message, advantageously the message "PromptAnd- CollectUser-InformationResult", within which message the IP device 6 inserts this number "ABCDEFG" received from the voice mail server 92 or application 91;
  • subscriber A's 1 line and/or subscriber B's 2 line may be so-called mobile subscriber line, such as a mobile station, - instead of fixed telecommunications network, telecommunications network may be a mobile telephone network,
  • IN network of telecommunications network may be or be connected to mobile network, or
  • VOP Voice Over Packet
  • the voice mail service and the system implemented by it or the apparatus implementing it may be included or not be included in telecommunications network, when the service is a system maintained by an external service provider, from which a connection is set up via an access network of telecommunications network (not illustrated in figures) and telephone exchange to intelligent network and further in it via IP device 6 to IVR part 10, in which there is a voice mail application 91 or server 92 implementing the voice mail service.
  • the IP device includes or is connected to a control part which transfers the control of call to the voice mail server or application.
  • Such call control may also be accomplished so that the voice mail server or application is equipped with an INAP interface, which is an IP device from the point of view of IN network and SCP.
  • INAP interface which is an IP device from the point of view of IN network and SCP.
  • the INAP protocol is a protocol especially intended for IN network, and that facilities corresponding INAP protocol may also be produced with other data transmission protocols used in telecommunications networks.
  • facilities corresponding INAP facilities may be produced with CAMEL protocol.
  • CAMEL protocol one is correspondingly able to control announcing devices (Intelligent Peripheral).

Abstract

A method and an apparatus for setting up a connection in telecommunications network by means of a call back function of a voice mail service and a voice mail system provided with a call back function in telecommunications network. It is characteristic of the invention that the voice mail service is implemented with a voice mail application, which is integrated in the IN network's IP device (6), when in order to set up a connection from the voice mail service user's or the subscriber B's (2) line to the message sender's or the subscriber A's (1) line, first a connection is set up from the subscriber B's line to the voice mail application via the IN network's IP device (6), with the IP application of which the connecting control is temporarily transferable to the voice mail application (91), when via the IN network's SSP (5) a logic INAP connection between the SCP (4) and the IP device (6) is set up. Thus, the connecting based on caller identification by means of a call back function is enabled from the subscriber B's line to the subscriber A's line at the same time as the unnecessary connection from the SSP to both the IP device and voice mail application may be disconnected.

Description

Method and apparatus for setting up a connection by means of a call back function of a voice mail service and a voice mail system provided with a call back function for setting up a connection
The present invention relates to telecommunications and voice mail service. In more detail, the object of the present invention is a method according to the preamble of Claim 1 and an apparatus according to the preamble of Claim 5 for setting up a connection in telecommunications network by means of a call back function of a voice mail service and a voice mail system with a call back function according to the preamble of Claim 6 for setting up a connection.
Typically, intelligent network (IN) includes at least one lower-level service switching point SSP which is in communication with telecommunications network exchange, and with which at least one intelligent peripheral (IP) device and a higher level service control point (SCP) controlling the service switching point (SSP) or SSP group are in communication.
In telecommunications network, as caller or subscriber A dials subscriber B's call number or subscriber number, it activates a connecting phase, at which time the voice mail service is activated when: subscriber B's line is inactive; subscriber B's line does not answer the call of subscriber A; or connecting control information has been stored in the telecommunications network for forwarding incoming calls for subscriber B into subscriber B's voice mail service.
Hereinafter, the calling or dialling subscriber line is referred to as subscriber A and, correspondingly, the called or target subscriber line is referred to as subscriber B. Voice mail service is already known as a network service provided by network operator, when the users of voice mail service are typically in communication with rVR (Interactive Voice Response) equipment arranged into telecommunications network, in which functions a voice mail server or application, that is, VMS (Voice Message Server) which produces the voice mail service, the user-specified settings of which the user may control with commands given from a terminal, which are typically tone frequency or dual-tone multi frequency (DTMF) signals or voice commands. The weakness and problem of the voice mail service provided as a network service is that no call back possibility has generally been arranged into it, because in known voice mail services the VMS is activated to be the server receiving subscriber A's call, if:
- the original subscriber line B does not answer,
- the original subscriber line B is inactive, or
- the original subscriber line B has forwarded the incoming calls meant for it into an answering service, when the direct call set-up chain from subscriber A over telecommunications network to subscriber B's line is cut off, and the identifying information of subscriber A is not conveyed into subscriber B's line to be utilised in calling setup. When subscriber B retrieves the messages in the voice mail service, subscriber B only hears the messages, and the requested communication with the senders of the messages is typically based only on the heard contact information.
The call back function related to answering service or message is essentially already known only as a feature arranged for a telecommunications network terminal and/or separate answering device. In order to enable call back, one has been able to utilise the calling line identification (CLI) information signalled in signalling information field, such as in OPC (Originating Point Code), directed from subscriber A's line over telecommunications network to subscriber B's line, or subscriber A's identity, when subscriber A's subscriber line identity signalled into subscriber B's line may be stored as subscriber A's line identifying information in the memory of received or missed calls on telecommunications network terminal.
If a call back function is arranged into the application logic of a voice mail service provided as network service, the VMS of which is connected to telecommunications network exchange, this call back function would be based on message information stored in voice mail service database, which information includes the identifying information of the message sender, subscriber line A, then the call back connection being set up is first routed from subscriber line B to telecommunications network exchange, then from telecommunications network exchange to voice mail service VMS, and back from VMS to telecommunications network exchange, and finally via telecommunications network exchange(s) to subscriber line A. Then, the problem is that the connection makes an unnecessary detour from telephone exchange via VMS back to telecommunications network telephone exchange, and that the connection routed unnecessary via VMS remains on for the time of the whole B-to-A connection, and unnecessarily reserves connection resources.
From WO publication 00/51318 is known a voice mail service which utilises IN network (Intelligent Network) and offers a possibility for call back. This solution utilises American IN and ISUP (Integrated Services Digital Network User Part) standards, such as AINGR FR-15 and GR-1129. According to the publication , the
VMS voice mail server is in communication with IN network's SSP (Service
Switching Point). When a voice mail service user wishes to answer a message with call back function, the voice mail server sends an ISUP retrieval message, which includes the caller identification of the message sender, to SSP which then sends a TCAP (Transaction Capabilities Application Part) message to IN network's SCP (Service Control Point), which analyses the TCAP message and disconnects the voice mail service user's connection with voice mail server and directs SSP to set up a connection from the voice mail user to the sender of the message. According to the publication , the call back connection is set up from SSP to the sender of the message via an IP (Intelligent Peripheral) device which monitors the disconnecting of call back connection and which communicates via voice mail telephone network.
Similar to the above mentioned WO publication, the primary object of the invention is to reduce the need for writing down or memorising telephone numbers, and thus improve and speed up the voice mail service, particularly the object is to accomplish a new and inventive method, apparatus and system for setting up a connection in telecommunications network by means of a call back function of a voice mail service, in order to significantly increase the usability of a voice mail service, for example, when driving a car, and to speed up and secure the call back phone call set-up to the message sender, subscriber A's, line.
The objects of the invention are achieved with the method, the characteristics of which are defined in the preamble of the independent claim 1 and dependent claims 2-4, and with the apparatus, the characteristics of which are defined in the preamble of the independent claim 5, and with the system, the characteristics of which are defined in the preamble of the independent claim 6 and dependent claims 7-11, mentioned in the beginning.
The invention is generally based on the idea that a logic INAP (Intelligent Network Application Protocol) connection is set up between the TN network's IP device, which includes or is connected to the VMS, and the SCP by means of the SCP, that after the voice mail service user has informed the VMS of wishing to answer with the call back function to the message sender, first a connection is set up from line B to the VMS via the IP device, with the IP application of which the connecting control is temporarily transferred to the VMS, when an INAP (Intelligent Network Application Protocol) connection is set up via the IP device between telecommunications network and the VMS, and that by means of INAP connection, a connection from subscriber B's line to subscriber A's line is set up by means of caller identification signalled into the VMS when the message was sent, at the same time that the connection from the SSP to the IP device and the VMS is disconnected.
Especially advantageously the call back connection from the voice mail service user's or subscriber B's line to the message sender's, subscriber A's line is set up in the following way: a call is made from the voice mail service user's or the subscriber B's line to voice mail service,
- the call is routed to the IN network via the SSP, - the SSP queries routing information from the SCP,
- the SCP commands the SSP to route the call to the IP device,
- the SCP sets up the logic INAP connection between the SCP and the IP device via the SSP,
- control part and service are activated in the IP device, when the call is routed to the IP device,
- the IP device, which includes or is connected to the VMS, transfers the call to the VMS,
- the subscriber B hears from the voice mail application or server if any messages were left, - the subscriber B controls the VMS voice mail application or voice mail server, advantageously with voice control or DTMF signals,
- the subscriber B tells the VMS of wishing to set up an answer call for the sender of the message with call back function,
- after which the connection is set up from the subscriber B's line to the subscriber A's line based on the caller information signalled to the VMS when the message was sent, and the connection from the SSP to the IP device and the VMS is disconnected.
The invention will now be explained by way of a certain advantageous embodiments, but not limiting it to apply to only such individual embodiments, with reference to the accompanying drawing, in which FIG. 1 illustrates a simplified system for implementing a voice mail service in telecommunications network according to known prior art, FIG. 2 illustrates a system according to a certain advantageous embodiment of the invention for implementmg a voice mail service according to the invention, in which the IP device producing the voice mail service includes a software-based control part and voice mail application,
FIG: 3 illustrates another certain advantageous embodiment of the invention, in which the IP device producing the voice mail service is connected to a physical voice mail server part, and
FIG. 4 illustrates the invention as program flow chart and flow diagram.
Referring to Figure 1. In order to clarify the present invention, next will be explained a telecommunications network which is connected to intelligent network 4, 5, 6, or IN network, and which is, for instance, a fixed circuit-switched PSTN (Public Switched Telecommunication Network) network or a digital PLMN (Public Land Mobile Network) network which applies TDM and/or CDM channelling or a combination of such networks, which will hereinafter be referred to as telecommunications network for simplicity. Telecommunications network, which is connected to an IN network, comprises typically of:
A. terminals of telecommunications network, which are at least the calling line or subscriber A's 1 line and the target line or subscriber B's 2 line;
B. network elements of telecommunications network:
- IN part, which includes a higher-level SCP 4 and a lower-level SSP 5 which is connected to IP device 6,
- the first, for example national or international, telephone exchange 7 which is connected to subscriber A's 1 line and via which subscriber A is in communication with IN part's SSP 5, and
- the second, also for example national or international, telephone exchange 8 which is connected to subscriber B's 2 line and via which subscriber B 2 is in communication with IN part's SSP 5. Naturally, subscriber A's and subscriber B's 1 and 2 lines may also be located only in the area of the first telephone exchange 7 or the second telephone exchange 8. Thus, one of these telephone exchanges is unnecessary from the point of view of connection, connecting, message sending and message retrieving, because subscriber A 1 and subscriber B 2 are connected to one telephone exchange 7 or 8.
According to known prior art, the voice mail service is accomplished with voice mail server 9, which is connected to telecommunications network telephone exchange 8. As telecommunications network telephone exchanges are arranged hierarchically in relation with each other to local exchanges of lowest level, district exchanges of intermediate level and national or international exchanges of highest level, voice mail servers 9 are connected to hierarchically higher-level district and national or international telephone exchanges in order to accomplish a centralised voice mail service, and respectively, voice mail servers 9 are arranged to lower-level local and district exchanges in order to accomplish a distributed voice mail service. In the example of Figure 1, the voice mail server 9 is in communication with one telephone exchange which is a national or international telephone exchange 8 of telecommunications network.
It is generally known that in order to accomplish telecommunications and data transmission connections between the network elements of telecommunications network, connectionless CCS signalling (Common Channel Signalling), which is based on SS7 (Signalling System 7) signalling according to ITU-T recommendations, has been arranged between network elements. Signalling may also be CAS signalling (Channel Associated Signalling) with connection, when the signals are transmitted in a voice channel. When CCS signalling is utilised in a telecommunications network provided with IN network: - subscriber A's 1 line, the first telephone exchange 7, lower-level SSP 5 of intelligent network part, the second telephone exchange 8, subscriber B's 2 line and VMS 3 employ ISUP protocol or TUP (Telephony User Part) protocol above the third layer of SS7 protocol stack according to OSI model for implementing telecommunications and data transmission between these parts, - intelligent network part's SSP 5, SCP 4 and IP (Intelligent Peripheral) device 6 are each equipment employing INAP (Intelligent Network Application Part) protocol of the seventh layer of SS7 protocol stack according to OSI model from the point of view of telecommunications and data transmission.
Referring to Figures 2 and 3, which illustrate voice mail systems in PSTN and/or PLMN network according to the first and second advantageous embodiments of the invention, in which both the first and second telephone exchanges 7, 8 are connected to IN network's SSP 4, and in which the first telephone exchange 7 is connected to calling subscriber A's 1 line(s), and in which the second telephone exchange is connected to subscriber B's 2 line(s) employing voice mail service. In the first advantageous embodiment of the invention illustrated in Figure 2, the voice mail service is accomplished with software by means of a voice mail application 91 which is included or is connected to the IP application in IP device 6. In the second advantageous embodiment of the invention illustrated in Figure 3, the voice mail service is accomplished with a physical voice mail server 92 which is in data transmission communication with IN network's intelligent peripheral or IP device 6.
In the both embodiments according to Figures 2 and 3, the IP device 6 is in data transmission communication with IN network's SSP 5 which is in data transmission communication with IN network's SCP 4. hi IN network, SSP 5, SCP 4 and IP device 6 are each known per se equipment employing INAP protocol from the point of view of data transmission. Thus, one is able to accomplish signalling according to INAP protocol between IN network's SCP 4 and IP device 6 via SSP 5 in the voice mail service according to the invention. According to the basic idea of the invention, a connection is set up in the method, system and with the computer program from the voice mail service user's or subscriber B's 2 line to telephone exchange 7 or 8 and via IN network's SSP 5 to
IP device 6, which includes or is connected to: - in the embodiment illustrated in Figure 2, a software-based voice mail application 91, when in order to produce a voice mail service and call back function of the voice mail service and to control and implement their different phases, the software-based control part 11 included in the IP device 6 communicates with the software-based voice mail application 91 included in or connected to the IVR part 10, or
- in the embodiment illustrated in Figure 3, a physical voice mail server 92, when also the IP device 6 is a physical device and both IVR part 10 and TP device 6 are equipped with, for example, integrated logic circuits in order to accomplish a voice mail service and a call back function of a voice mail service and to control and implement their different phases.
Functionally, the voice mail application 91 according to the first embodiment of the invention, which is advantageously included in IVR part's 10 IVR application, and the physical voice mail server 92 according to the second embodiment of the invention, which is connected to IP device 6 and which includes logic equivalent to the IVR part's voice mail application, do not essentially differ from each other.
When subscriber A 1 dials a call to subscriber B's 2 line, the dialled call is routed to the voice mail service, and the logic of the voice mail application stores the identifying information and or message of subscriber A's line 1 into the voice mail service database, when
- subscriber B's 2 line is inactive;
- subscriber B's 2 line does not answer subscriber A's 1 call; or
- connecting information has been stored in the telecommunications network for forwarding incoming calls for subscriber B 2 into subscriber B's voice mail service. When subscriber B dials a call to the voice mail service to retrieve messages, the voice mail service according to the invention functions in the following way:
- a call is made from voice mail service user's or subscriber B's 2 line to voice mail service,
- the call is routed to IN network via SSP 5,
- SSP 5 queries routing information from SCP 4 using INAP protocol.
- SCP 4 commands SSP 5 to route the call to the IP device 6,
- SCP 4 sets up a logic data transmission connection using INAP protocol between SCP 4 and TP device 6 via SSP 5,
- control service is activated in the IP device 6, when the call is routed to IP device 6,
- the IP device 6 transfers the call to the voice mail application 91 or voice mail server 92, which is or is connected to IVR part 10, - subscriber B 2 hears from the voice mail application 91 or voice mail server 92 if any messages were left,
- subscriber B 2 controls the voice mail application 91 or server 92 with either voice control or DTMF signals,
- subscriber B 2 tells voice mail application 91 or voice mail server 92 of wishing to set up a call back connection to the sender of the message.
- Finally a connection is set up by means of the call back function from subscriber B's 2 line to subscriber A's 1 line based on the caller information signalled into voice mail application 91 or server 92 when subscriber A left the message, and the unnecessary connection via SSP 5 and TP device 6 to voice mail application 91 or voice mail server 92 is disconnected.
Because according to the invention, the IP application transfers the call control occasionally to IVR part 10, which may be a part of the IP application of the IP device 6 or which may be located as a separate IVR application in the IP device 6, signalling according to INAP protocol may be produced between telecommunications network and IVR part 10 or fVR application via SSP 5 by means of SCP 4 and IP device, which signalling enables setting up a new connection so that the unnecessary connection between TN network's SSP 5 and IP device 6 and IVR part 10 or IVR application may be disconnected, and to set up a new call from the voice mail service or voice mail application 91 or voice mail server 92 user, subscriber line B 2, via telecommunications network exchange or centres 7, 8 to the subscriber line A 1 who left the message.
It is advantageous according to the invention that when SCP 4 sets up a logic connection using INAP protocol between SCP 4 and IP device 6, SCP 4 at the same time commands SSP 5 to route the call using ISUP protocol to IP device 6, when a talking connection is set up from the caller, that is, voice mail application 91 or server 92 user to the IP device. After the IP device 6 has received from SCP 4 an INAP message, advantageously the message "PromptAndCollectUser- Information", within which is sent the announcement number which the IP device 6 should dial. Then the control part 11 included in or connected to the IP device 6 detects that the announcement number in question means that the control of call is transferred to voice mail server 92 or application 91. Thus according to the invention, the IP device 6 is not activated to function according to the specifications of ETSI (The European Telecommunications Standards Institute) only to play the announcement and possibly receive DTMF (Dual Tone Multi Frequency) signals and to acknowledge successful function to SCP with an INAP message, advantageously with the message "PromptAndCollectUserlnformation- Result".
Thus, the voice mail server 92 or application 91 is accomplished to function according to the invention like there was no IP device 6 in between. Then, when the voice mail server 92 or application 91 user activates the call back function with DTMF or voice control, the voice mail server 92 or application 91 cuts off its own speech processing process and transfers the control of call to the IP device 6 with a certain manner defined in advance. This manner defined in advance may be, for example: • when the call back function is activated, the voice mail server 92 or application 91 informs the IP device 6 (for the ongoing process of the same call) to "direct to number ABCDEFG", that is, the subscriber number of subscriber line A 1, in which A-G are advantageously hexa numbers, each between 0-F;
• the information is advantageously transferred software-based inside the computer from the voice mail server 92 or application 91 process to the P device 6 call control process, or externally by means of a suitable data transmission connection, for example, TCP/IP (Transmission Control Protocol/Internet Protocol) connection;
• after the IP device 6 has received from the voice mail server 92 or application 91 call control information "to number ABCDEFG", the IP device 6 sends SCP 4 an INAP message, advantageously the message "PromptAnd- CollectUser-InformationResult", within which message the IP device 6 inserts this number "ABCDEFG" received from the voice mail server 92 or application 91;
• after receiving the INAP message including this number "ABCDEFG", advantageously the message "PromptAndCollectUserlnformationResult", the application in SCP 4 detects that the call must be routed to subscriber number "ABCDEFG", that is to subscriber line A 1, when SCP 4 first disconnects the connection to the IP device 6 with an INAP message, advantageously the message "DisconnectForwardConnection", and then SCP 4 commands SSP 5 to set up a new call to subscriber number "ABCDEFG", that is, subscriber line A l.
The invention was only explained above by way of its certain advantageous embodiments related to fixed telecommunications network. Thus, this is not to limit the invention to apply to only such embodiments related to fixed telecommunications network application environment and/or such individual embodiments. As is evident to the persons skilled in the art , many alternative solutions and variations are possible within the scope of the inventive idea and the scope of protection defined in the accompanying claims.
One must emphasise that in addition to the above explained embodiments of fixed subscriber lines A and B and IN network, the invention may also be applied extremely extensively in other communication networks and combinations of different communications networks. Advantageous examples are the following:
- instead of fixed subscriber lines, subscriber A's 1 line and/or subscriber B's 2 line may be so-called mobile subscriber line, such as a mobile station, - instead of fixed telecommunications network, telecommunications network may be a mobile telephone network,
- instead of fixed telecommunications network, IN network of telecommunications network may be or be connected to mobile network, or
- VOIP (Voice Over Internet Protocol) or VOP (Voice Over Packet) network, which utilises intelligent network control.
Further one must emphasise that the voice mail service and the system implemented by it or the apparatus implementing it may be included or not be included in telecommunications network, when the service is a system maintained by an external service provider, from which a connection is set up via an access network of telecommunications network (not illustrated in figures) and telephone exchange to intelligent network and further in it via IP device 6 to IVR part 10, in which there is a voice mail application 91 or server 92 implementing the voice mail service.
In the above explanation of the embodiment, it was explained that the IP device includes or is connected to a control part which transfers the control of call to the voice mail server or application. Such call control may also be accomplished so that the voice mail server or application is equipped with an INAP interface, which is an IP device from the point of view of IN network and SCP. One must notice, however, that thus accomplished IP device according to the invention does not function according to ETSI specifications, but provides voice mail service.
Further it must be stated that the INAP protocol is a protocol especially intended for IN network, and that facilities corresponding INAP protocol may also be produced with other data transmission protocols used in telecommunications networks. For example in mobile phone network, facilities corresponding INAP facilities may be produced with CAMEL protocol. With CAMEL protocol, one is correspondingly able to control announcing devices (Intelligent Peripheral).
Still on the matter of utilising the basic idea of the invention, it may be stated without digressing from the basic idea and functioning principle of the invention that instead of the above explained voice mail server or application included in or connected to IP device one may use other servers or service applications, such as an automatic telephone operator server or application.

Claims

Claims
1. A method for setting up a connection by means of a call back function of a voice mail service from the voice mail service user's or subscriber B's (2) line to the message sender's or subscriber A's (1) line in a telecommunications network, a telephone exchange (7, 8) of which is connected to or is in communication with an intelligent network or IN network, in which an INAP protocol is utilised for a data transmission and which comprises of at least one lower-level SSP (5), which is in a communication with the telecommunications network exchange (7, 8) and with which at least one IP device (6) and at least one higher level SCP (4) controlling the SSP or SSP group are in communication, characterised iri that the logic INAP connection is set up by means of the SCP between the TN network's IP device (6), which includes or is connected to a VMS (91, 92), and the SCP (4), that after the voice mail service user or subscriber B (2) has informed the VMS of wishing to answer with the call back function to the message sender or subscriber A (1), first a connection is set up from the subscriber B's (2) line to the VMS via the IP device (6), with an IP application of which the connecting control is temporarily transferred to the VMS, when the INAP (Intelligent Network Application Protocol) connection is set up via the IP device between the telecommunications network and the VMS, and that by means of the INAP connection, the connection from the subscriber B's line to the subscriber A's line is set up by means of caller identification signalled into the VMS when the message was sent, at the same time that the connection from the SSP (5) to the TP device (6) and the VMS is disconnected.
2. A method according to Claim 1, characterised in that in the method
- the SCP (4) commands the SSP (5) to route the call to the IP device (6),
- the SCP (4) sets up the logic INAP connection between the SCP (4) and the IP device (6) via the SSP (5), - a control part (11) is activated in the IP device (6), when the call is routed to the IP device (6),
- the IP device (6) transfers the call control to the VMS (91, 92),
- the subscriber B (2) is informed of the message or messages in the VMS (91, 92),
- the VMS (91, 92) receives an announcement from the subscriber B (2) of wishing to set up an answering call to the message sender by means of the call back function, and
- the connection is set up from the subscriber B's (2) line to the subscriber A's (1) line based on the caller information signalled to the VMS (91, 92) when the message was sent, and the connection to the SSP's (5) DP device (6) and the VMS is disconnected.
3. A method according to Claim 1 and/or 2, characterised in that when the VMS (91, 92) user activates the call back function, the VMS cuts off its own speech processing process and transfers the control of call to the IP device (6), that at the same time as the logic INAP connection is set up between the SCP (4) and the D? device, the SSP (5) is commanded to route the call by means of the SCP using the ISUP protocol to the D? device in order to set up a talking connection from the subscriber B's (2) line to the IP device, and that after the IP device receives from the SCP an INAP message, which is advantageously the message "PromptAndCollect-User-Information", within which is sent the announcement number which the D? device should dial, when the control part (11) included in or connected to the IP device detects that the announcement number means that the control of the call is transferred to the VMS.
4. A method according to Claim 3, characterised in that
• when the call back function is activated, the voice mail server (92) or application (91) informs the IP device (6) to "direct to number ABCDEFG", which is the subscriber number of the message sender, subscriber A (1), in which A-G are advantageously hexa numbers, each between 0 - F; • the information is transferred, advantageously software-based inside the computer or externally by means of a suitable data transmission connection, advantageously by means of TCP/IP (Transmission Control Protocol/Internet Protocol) connection from the VMS's (91, 92) process to the IP device's (6) call control process;
• after the TP device (6) has received from the VMS (91, 92) the call control information "to number ABCDEFG", the IP device sends the SCP (4) an INAP message, which is advantageously the message "PromptAndCollectUser-InformationResult", within which is inserted this number "ABCDEFG" received by the D? device from the VMS;
• after receiving the INAP message, which is advantageously the message "PromptAndCollectUser-rnformationResult", which includes the number "ABCDEFG" , the application in the SCP (4) routes the call to subscriber line number "ABCDEFG", that is to subscriber line A (1), so that first the connection from the SCP to the IP device (6) is disconnected with the INAP message, which is advantageously the message "DisconnectForward- Connection", after which the SSP (5) is commanded to set up a new connection to subscriber number "ABCDEFG", that is, the subscriber line A.
5. An apparatus in telecommunications network for setting up a connection by means of a call back function of a voice mail service from the voice mail service user or the subscriber B's (2) line to message sender or the subscriber A (1) line, the telecommunications network telephone exchange (7, 8) of which is connected to or is in communication with an intelligent network or the TN network, in which the INAP protocol is utilised for data transmission and which includes at least one lower-level SSP (5), which is in communication with telecommunications network exchange (7, 8) and with which at least one D? device (6) and at least one higher level SCP (4) controlling the SSP or the SSP group are in communication, characterised in that the apparatus includes a computer program, which, in order to accomplish a call back function of a voice mail service, is arranged to the D? device (6) most suitably as a part of the voice mail application (91) implementing the voice mail service, or voice mail server (92) in data transmission communication with the IP device (6) and that in the logic control of the computer program, - the SCP (4) commands the SSP (5) to route the call to the D? device (6),
- the SCP (4) sets up the logic INAP connection between the SCP (4) and the IP device (6) via the SSP (5),
- a control part (11) is activated in the D? device (6), when the call is routed to the D? device (6), - the D? device (6) transfers the control of call to voice mail application or server (91, 92),
- the subscriber B (2) is informed of the message or messages in the voice mail application or server (91, 92),
- voice mail application or server (91, 92) receives an announcement from the subscriber B (2) of wishing to set up an answering call to the message sender or the subscriber A by means of call back function, and
- a connection is set up from the subscriber B's (2) line to the subscriber A's (1) line based on the caller information signalled into the voice mail application or server (91, 92) when the message was sent, and the connection between the SSP (5) and the D? device (6) and voice mail application or server (91, 92) is disconnected.
A voice mail system provided with call back function for setting up a connection from the voice mail service user's or the subscriber B's (2) line to the message sender's or the subscriber A's (1) line in telecommunications network, the telephone exchange (7, 8) of which is connected to or is in communication with the IN network, in which the INAP protocol is utilised for data transmission and which comprises of at least one lower-level SSP (5), which is in communication with the telecommunications network exchange (7, 8) and with which at least one IP device (6) and at least one higher level SCP
(4) controlling the SSP or the SSP group are in communication, characterised in that in order to set up a connection from the subscriber B's (2) line to the subscriber A's (1) line by means of a call back function of a voice mail service, the IP device (6) includes or is connected to a voice mail application (91) or voice mail server (92), and that data transmission between the IN network's SCP (4) and the IP device (6) is based on the INAP protocol, when at the same time as the connection to the subscriber A's (1) line is set up, the unnecessary connection to the IP device (6) and voice mail application (91) or server (92) is disconnected.
7. A system according to Claim 6, characterised in that in the system
- the SCP (4) commands the SSP (5) to route the call to the IP device (6),
- the SCP (4) sets up the logic INAP connection between the SCP (4) and the IP device (6) via the SSP (5),
- the control part (11) is activated in the IP device (6), when the call is routed to the IP device (6),
- the IP device (6) transfers the call control to the VMS (91 , 92),
- the subscriber B (2) is informed of the message or messages in the VMS (91, 92),
- the VMS (91, 92) receives an announcement from the subscriber B (2) of wishing to set up an answering call to the message sender by means of the call back function, and
- the com ection is set up from the subscriber B's (2) line to the subscriber A's (1) line based on the caller identification signalled into the VMS (91, 92) when the message was sent, and the connection from the SSP (5) to the IP device (6) and the VMS is disconnected.
8. A voice mail system according to Claim 6 and/or 7, characterised in that the
IP device (6) includes or is connected to a software-based voice mail application (91), that in order to produce a voice mail service and a call back function and to control and implement their different phases, the IP device (6) includes a software-based control part (11) which communicates with a software-based voice mail application (91) or separate voice mail server (92) implemented to the IVR part (10), when the IVR part (10) and the IP device (6) are both equipped with an advantageously integrated logic circuit.
9. A voice mail system according to one of Claims 6-8, characterised in that when the voice mail server (92) or application (91) user activates the call back function, the VMS cuts off its own speech processing process and the control of the call is transferred to the IP device (6), that at the same time as the SCP sets up the logic INAP connection between the SCP (4) and the IP device (6), the SCP commands the SSP (5) to route the call using the ISUP protocol to the
IP device (6) in order to set up speech connection from the VMS (91, 92) user to the IP device, and that after the IP device receives from the SCP an INAP message, advantageously the message "PromptAndCollectUser-Information", within which is the announcement number which the IP device should dial, the control part (11) included in or connected to the IP device detects that the announcement number in question means that the control of the call is transferred to the VMS.
10. A voice mail system according to Claim 9, characterised in that • when activating call back function, the VMS (91, 92) informs the IP device (6) to "direct to number ABCDEFG", which is the subscriber number of the message sender, the subscriber line A (1), in which A-G are advantageously hexa numbers, each between 0 - F;
• the information is transferred, advantageously software-based inside the computer or externally by means of a suitable data transmission connection, advantageously by means of the TCP/IP (Transmission Control Protocol/Internet Protocol) connection from the VMS's (91, 92) process to the IP device's (6) call control process;
• after the IP device (6) has received the call control information "to number ABCDEFG" from the VMS (91, 92), the IP device sends the SCP (4) an INAP message, which is advantageously the message "PromptAndCollect- UserlnformatioriResult", which includes the number "ABCDEFG" received by the IP device from the VMS; after receiving the INAP message, which is advantageously the message
"PromptAndCollectUser-InformationResult", which includes the number "ABCDEFG" , the application in the SCP (4) routes the call to subscriber line number "ABCDEFG", that is to the subscriber line A (1), so that first the connection from the SCP to the IP device (6) is disconnected with the INAP message, which is advantageously the message "DisconnectForward-
Connection", after which the SCP commands the SSP (5) to set up a new connection to subscriber number "ABCDEFG", that is, the subscriber line A.
A voice mail system according to one of Claims 6-10, characterised in that the VMS (91, 92) is equipped with the INAP interface, when, from the point of view of the IN network and the SCP, it is a matter of the IP device which provides voice mail service.
PCT/FI2002/000481 2001-06-06 2002-06-05 Method and apparatus for setting up a connection by means of a call back function of a voice mail service and a voice mail system provided with a call back function for setting up a connection WO2002100119A1 (en)

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FI20011198A FI112019B (en) 2001-06-06 2001-06-06 Method and arrangement for establishing a connection by means of a feedback function of a voicemail service and a voicemail system equipped with the feedback function to establish a connection

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