JP5886107B2 - Switching apparatus and call control signal conversion program - Google Patents

Description

  The present invention relates to an exchange apparatus and a call control signal conversion program. For example, a VoIP (Voice over IP (Internet Protocol)) line and No. 1 It can be applied to IP-PBX (Private Branch Exchange) that can accommodate 7 common lines.

  For example, in a corporate network, an IP-PBX may be arranged at each site, and a plurality of IP-PBXs may intervene in a call between an external terminal and an extension terminal or a call between extension terminals. Here, in order to exchange call control signals (signaling signals) between IP and PBX, No. If it is possible to apply 7 common lines, it is also possible to apply a VoIP line that is a dedicated line (hereinafter referred to as a SIP (Session Initiation Protocol) dedicated line).

  FIG. 7 shows a case of tandem connection via a common line. IP-PBX3-1 is No. 7 is connected to the IP-PBX 3-2 via the common line 4-1, and the IP-PBX 3-2 is connected to the IP-PBX 3-2. 7 is assumed to be connected to the IP-PBX 3-3 via the common line 4-2. When the call signal from the ISDN terminal 1-1 reaches the IP-PBX 3-1 via the telephone network 2, the IP-PBX 3-1 uses the telephone number “01234456789” of the ISDN terminal 1-1 as a predetermined position for calling number. And an IAM (Initial Address Message) signal including “ISDN station line” at a predetermined position for the terminal type. 7 to the IP-PBX 3-2 via the common line 4-1 (see Non-Patent Document 1). IP-PBX3-2 is No. The same IAM signal as described above is transmitted to the IP-PBX 3-3 via the 7 common line 4-2. Since the IP-PBX 3-3 has the terminal type “ISDN station line”, the destination terminal 1-2 is notified of the incoming call from the ISDN station line including the calling party number, and the destination terminal 1-2 is connected to the ISDN station line. Since it is an incoming call, outside line incoming call processing is performed, and if the calling number display mode is selected, the calling number is displayed. As described above, the IP-PBX 3-2 at the relay stage can transmit the terminal type received from the IP-PBX 3-1 to the IP-PBX 3-3 side as it is. Note that the position and code to be included in the terminal type in the IAM signal are not determined in Non-Patent Document 1 or the like, but are uniquely determined by the IP-PBX manufacturer or the like.

  In the transmission of the same terminal type as described above, IP-PBX 3-1 is connected to IP-PBX 3-2 via a SIP dedicated line, and IP-PBX 3-2 is connected to IP-PBX 3-3 via a SIP dedicated line. It is also done when connected to.

JP 2011-101130 A

TTC JT-Q763 IETF RFC3261 IETF RFC3398

  However, in the conventional IP-PBX apparatus, No. 7 The terminal type transferred from the common line cannot be transferred to the SIP private line, and the terminal type transferred from the SIP private line is No. 7 cannot be transferred to the common line, and there is a problem that a service using the terminal type information cannot be realized.

  FIG. 10 shows that IP-PBX3-1 is No. 7 shows a case where the IP-PBX 3-2 is connected to the IP-PBX 3-2 via the 7 common line 4-1, and the IP-PBX 3-2 is connected to the IP-PBX 3-3 via the SIP dedicated line 4-2a. Note that the SIP dedicated line 4-2a is a dedicated line that passes through the IP network 5. Also in this case, when the call signal of the ISDN terminal 1-1 reaches the IP-PBX 3-1 via the telephone network 2, the IP-PBX 3-1 calls the telephone number “01234456789” of the ISDN terminal 1-1. And an IAM signal including “ISDN station line” in the predetermined position for the terminal type. 7 to the IP-PBX 3-2 via the common line 4-1. The IP-PBX 3-2 converts the IAM signal into a SIP message “INVITE” for transfer to the SIP dedicated line 4-2a (see Non-Patent Document 3 and Patent Document 1), and passes through the SIP dedicated line 4-2a. Send to IP-PBX3-3. In this INVITE message (Non-Patent Document 2), the telephone number “01234456789” of the calling terminal 1-1 is included as the calling number, and “dedicated line” is included as the terminal type. Since the terminal type of the IP-PBX 3-3 is “SIP private line”, the destination terminal 1-2 notifies the destination terminal 1-2 of the incoming call from the SIP private line including the calling party number, and the destination terminal 1-2 receives from the SIP private line. Incoming call processing is performed, and if the calling number display mode is selected, the calling number is displayed.

  As described above, in the conventional IP-PBX (3-2), no. 7 The terminal type in the IAM signal coming from the common line could not be correctly reflected in the terminal type of the SIP message “INVITE” sent to the SIP private line. In addition, the terminal type of the SIP message “INVITE” coming from the SIP leased line is set to “No. 7 IAM signal sent to the common line could not be correctly reflected in the terminal type.

  Therefore, in the case where the call control signal arriving from the first or second call control signal line is relayed and sent to the second or first call control signal line, the exchange that can correctly deliver the type information of the calling terminal Devices and call control signal conversion programs are desired.

According to a first aspect of the present invention, a first interface unit for terminating a first call control signal line for transmitting / receiving a common line call control signal according to a common line system, and a second call control signal line for transmitting / receiving a SIP message are terminated. A second interface unit that performs conversion, a first call control signal conversion unit that converts an incoming common line call control signal into a SIP message and transfers it, and converts an incoming SIP message into a common line call control signal for transfer in exchange apparatus and a second call control signal converting unit, (1) fixed-length area that includes a plurality of routing label in each common line call control signal, the terminal type information of the calling terminal in each the common line call control signal , table a first storage unit which associates the information of any portion of the variable-length area and optional area, (2) the terminal type information originating terminal in each common line call control signal And a second storage unit that correlates the notation of the terminal type information of the calling terminal in the SIP message, (3) the first call control signal conversion unit is configured to receive the common line call control signal that has arrived. Access the first storage unit based on the routing label to obtain location information, obtain terminal type information of the calling terminal from the corresponding location of the incoming common line call control signal, and then access the second storage unit Then, the notation of the terminal type information of the calling terminal in the SIP message is obtained, and the notation is inserted into a predetermined location of the SIP message. (4) The second call control signal converting unit Based on the information, a routing label to be inserted into the common line call control signal is determined, the location information is obtained by accessing the first storage unit based on the routing label, and the location of the common line call control signal is obtained. Characterized by inserting a representation of the incoming calling terminal of the terminal type information in the common line call control signal obtained by accessing said second storage unit notation of the calling terminal of the terminal type information of the SIP message.

According to a second aspect of the present invention, there is provided a call control signal conversion program for a first interface unit for terminating a first call control signal line for exchanging a common line call control signal according to a common line system, and a second interface for exchanging a SIP message. A computer mounted in an exchange having a second interface unit that terminates a call control signal line includes (1) a plurality of routing labels for each common line call control signal and a calling terminal for each common line call control signal A first storage unit associating information of any one of the fixed-length area, variable-length area, and option area including the terminal type information, and (2) the terminal of the calling terminal for each common line call control signal A second storage unit that associates the description of the type information with the description of the terminal type information of the calling terminal in the SIP message; and (3) the incoming common line call control signal is transmitted to the SIP message. The first storage unit is accessed on the basis of the routing label of the incoming common line call control signal to obtain location information, and the corresponding common line call control signal After obtaining the terminal type information of the calling terminal from the location, the first storage unit is accessed to obtain the notation of the terminal type information of the calling terminal in the SIP message, and the notation is inserted into a predetermined location of the SIP message. A call control signal conversion unit, and (4) the incoming SIP message is converted into a common line call control signal and transferred, and based on the information of the destination terminal in the incoming SIP message, the common line call control signal A routing label to be inserted is determined, the location information is obtained by accessing the first storage unit based on the routing label, and the incoming SIP message is received at the corresponding location of the common line call control signal. As a second call control signal conversion unit for inserting the notation of the terminal type information of the calling terminal in the common line call control signal obtained by accessing the second storage unit by notation of the terminal type information of the calling terminal It is made to function.

  According to the present invention, when the call control signal arriving from the first or second call control signal line is relayed and transmitted to the second or first call control signal line, the type information of the calling terminal is correctly delivered. Will be able to.

It is a block diagram which shows the functional internal structure of IP-PBX which concerns on embodiment. It is a block diagram which shows the structure of the switching system with which IP-PBX which concerns on embodiment functions as a relay stage. It is a flowchart which shows the outline | summary of the conversion operation | movement from the IAM signal to the INVITE message in IP-PBX of embodiment. It is explanatory drawing which shows the structure of an ISDN user part. It is explanatory drawing which shows the structural example of the routing label / condition table in IP-PBX of embodiment. It is explanatory drawing which shows the structural example of the condition / reading location table in IP-PBX of embodiment. It is explanatory drawing which shows the structural example of the read information / type table in IP-PBX of embodiment. The IP-PBX of the embodiment is No. It is a sequence diagram at the time of performing an interwork from 7 common lines to a SIP private line. No. between a plurality of conventional IP-PBXs. It is a block diagram which shows the case where it connects in tandem via 7 common lines. It is explanatory drawing of the conventional subject.

(A) Main Embodiment Hereinafter, an embodiment of an exchange apparatus and a call control signal conversion program according to the present invention will be described with reference to the drawings. The exchange apparatus according to the embodiment is an IP-PBX.

(A-1) Configuration of Embodiment FIG. 1 is a block diagram illustrating a functional internal configuration of the IP-PBX 10 according to the embodiment. FIG. 1 shows the internal configuration mainly from the processing side of the call control signal (the majority of the media signal processing configuration is not shown). The IP-PBX 10 has a function realized by the CPU executing a predetermined program. Even in this case, the IP-PBX 10 can be functionally represented in FIG.

  The IP-PBX 10 includes an interface unit 11, a port unit 12, a call control unit 13, and a storage unit 14.

  Although not described in detail, the interface unit 11 includes an interface unit that terminates the ISDN network, an interface unit that terminates the analog communication network, an interface unit that terminates the communication terminal, and the like. No. described later. The seven common lines are terminated by the interface unit 11.

  The port unit 12 terminates the IP network. A later-described SIP leased line is terminated by this port unit 12.

  The call control unit 13 executes call control. The call control unit 13 includes a call control signal conversion unit 13A (see FIG. 3) required when the IP-PBX 10 further transfers a call control signal from another IP-PBX to another IP-PBX. Have. The call control signal conversion unit 13A converts an IAM signal into an INVITE message and converts an INVITE message into an IAM signal.

  The storage unit 14 stores information to be referred to when the call control unit 13 executes processing. The storage unit 14 stores a routine label / condition table 14A, a condition / reading location table 14B, and a reading information / type table 14C, which will be described later.

(A-2) Operation of Embodiment Next, the operation of the IP-PBX 10 of the embodiment, particularly, the operation of converting an IAM signal into an INVITE message will be described.

  As shown in FIG. 2, the IP-PBX 10 is No. 7 IP-PBX 10 B 1, 10 B 2, 10 B 3 connected via the common line 20 (20-1, 20-2, 20-3) from the IP-PBX 10 B 1, 10 B 2, 10 B 3 connected via the SIP dedicated line 21 When a call control signal is relayed to the PBX 10A, an operation for converting an IAM signal into an INVITE message is required. This embodiment is characterized in that even if an IAM signal is converted into an INVITE message, the terminal type information included in the IAM signal can be correctly inserted into the INVITE message.

  FIG. 3 is a flowchart illustrating an outline of the conversion operation from the IAM signal to the INVITE message in the IP-PBX 10 according to the embodiment. Note that the transfer destination from the IP-PBX 10 is determined to be the IP-PBX 10A in the routing process, but since this determination process has no features, the description thereof is omitted. The correspondence between the call control signal transfer destination and the call control signal transfer method (via the SIP dedicated line) is described in advance in a table or the like, and the call control signal transfer destination is determined to be IP-PBX 10A. Then, it is determined to pass through the SIP dedicated line 21, and it is determined to exchange SIP messages. In FIG. 3, such a description of the transfer destination determination processing is omitted.

  The call control signal conversion unit 13A is called No. When the call control signal from the 7 common line 20 is received, the processing shown in FIG. 3 is started, and first, it is confirmed that the received call control signal is an IAM signal (step S001).

  The IAM signal is one of signals defined by a signal format and code used in ISUP (ISDN user part). As shown in FIG. 4, the ISDN user part includes a routing label, a spare (4 bits), a line number, a message type, a fixed length essential part, a variable length mandatory part, and an optional part. The message type consists of 1 octet and is essential for all messages. The message type and message format of the ISDN user part are uniquely determined by the message type, and the message type of the IAM signal is “00000001”. When the message type of the received signal (ISDN user part) is “00000001”, it can be confirmed that the signal is an IAM signal.

  Next, the call control signal conversion unit 13A determines the unique information extraction condition based on the routing label of the received IAM signal (step S002). FIG. 5 is an explanatory diagram showing a configuration example of the routing label / condition table 14A. In FIG. 5, the unique information extraction condition a is applied when the routing label is “A”, the unique information extraction condition b is applied when the routing label is “B”, and the routing label is “C”. Describes that the unique information extraction condition c is applied. In FIG. 5, the routing label and the unique information extraction condition seem to correspond one-to-one, but the relationship is not limited to a one-to-one relationship, and a plurality of routing labels correspond to the same unique information extraction condition. It may be.

  The routing label is a label for a message transferred to a certain line connection in each line connection, and the same routing label is always used for a certain line connection. In other words, the routing label that defines the individual line connection indicates whether the IP-PBX in the previous stage that sent the IAM signal is IP-PBX10B1, IP-PBX10B2, or IP-PBX10B3. . Depending on the IP-PBX 10B1, IP-PBX 10B2, or IP-PBX 10B3 (manufacturer, creation time difference, etc.), the position where the unique information is inserted, the code representing the unique information, and the like are different. In order to discriminate the previous IP-PBX that sent the IAM signal, the routing label / condition table 14A is prepared in advance, and the unique information extraction condition a corresponding one-to-one with the IP-PBX 10B1, IP-PBX 10B2, or IP-PBX 10B3, We decided to obtain b or c.

  Here, terminal type information is defined in the IAM signal as the unique information or as an item of the unique information.

  Next, the call control signal conversion unit 13A accesses the condition / reading location table 14B using the unique information extraction condition a, b, or c related to the received IAM signal as a key, and extracts the unique information extraction location (reading location). And the unique information is read (steps S003 to S005). FIG. 6 is an explanatory diagram showing a configuration example of the condition / reading location table 14B. In FIG. 6, in the case of the unique information extraction condition a, it is roughly described as being read from the fixed length essential part, but this is for convenience of explanation, and in an actual table, for example, “fixed length required Read from the position of the octet sending order 9 of the copy "," read by reading in the parameter name PRA column of the option part "," read the unique information pointer at the predetermined position, and obtain the length of the unique information from the position indicated by the pointer Then, a specific reading method is described in the condition / reading location table 14B, such as “reading information by the length of the information”. FIG. 6 shows a case where the read target part is different from the fixed length essential part, the variable length essential part, and the option part depending on each unique information extraction condition. For example, different unique information extraction conditions are both optional parts. (However, it is necessary that the reading method from the option part is different, for example, the parameter name is different).

  Next, the call control signal conversion unit 13A refers to the read information / type table 14C, converts the read unique information into terminal type information in a format that can be inserted into the INVITE message, and inserts the converted terminal type information into INVITE. A message is generated (step S006), and the series of processing shown in FIG.

  FIG. 7 is an explanatory diagram showing a configuration example of the read information / type table 14C. In FIG. 7, the read information “AAA” has the terminal type “extension” and the information inserted into the INVITE message is “type1”, and the read information “BBB” has the terminal type “station line (external line)”. The insertion information in the INVITE message is “type 2”, and the read information “CCC” is described that the terminal type is “private line” and the insertion information in the INVITE message is “type 3”. Yes. For example, there may of course be a plurality of pieces of read information “type 1”.

  Although not shown, the INVITE message is composed of at least four fields of request, header, blank, and body. In headers of SIP messages including INVITE messages, headers beginning with “X-” are recognized as extension headers. In this embodiment, an extension header “X-Ssmate:” is prepared, and “type 1”, “type 2”, or “type 3” representing the terminal type is stored in the extension header.

  If the unique information extraction condition a corresponds to the IAM signal from the previous IP-PBX 10B1, the call control signal conversion unit 13A follows the flow of steps S001-S002-S003-S006 in FIG. If the INVITE message that inherits the terminal type is generated, and the unique information extraction condition b corresponds to the IAM signal from the previous IP-PBX 10B2, the call control signal conversion unit 13A performs step S001 in FIG. In the flow of S002-S004-S006, if the INVITE message that takes over the terminal type is generated and the unique information extraction condition c corresponds to the IAM signal from the previous IP-PBX 10B3, the call control signal conversion unit 13A takes over the terminal type in the flow of steps S001-S002-S005-S006 in FIG. It generates an INVITE message.

  FIG. 7 shows a sequence when interworking is performed from the 7 common lines to the SIP dedicated line, and the previous stage shows the case of the IP-PBX 10B1.

  If the IP-PBX 10B1 at the previous stage has an incoming ISDN line (step S101), No. 7 When transmitting to the common line 20, the terminal type is edited in the unique information (for example, user information parameter) of the IAM signal (step S102), and the IP-PBX 10 is called (step S103).

  In the IP-PBX 10, the terminal type edited in the unique information of the IAM signal is edited in the extension header of the INVITE message (step S104), and the IP-PBX 10A accommodating the destination extension terminal is passed through the SIP dedicated line 21. (Step S105).

  The IP-PBX 10A that accommodates the destination extension terminal 30-2 performs an incoming call process according to the terminal type edited in the extension header of the INVITE message (step S106).

  In the above description, the IP-PBX 10 that relays the call control signal converts the IAM signal into the INVITE message. However, in the following, the conversion control signal is the INVITE message and the converted call control signal is the IAM signal. The case will be briefly described. Although illustration is omitted, the description will be made according to the sequence of FIG. 8, and the components according to FIG.

  If there is a local line incoming call to the previous IP-PBX 10B1, the terminal type is edited in the extension header of the INVITE message and the call is made to the IP-PBX 10 when making a call to the SIP dedicated line 20.

  The IP-PBX 10 obtains information to be inserted into the routing label of the IAM signal from the information of the destination terminal of the INVITE message, accesses the routing label / condition table (see FIG. 5), extracts the unique information extraction condition, and extracts it. The condition / reading location table (see FIG. 6) is accessed using the unique information extraction condition as a key, and the location of the IAM signal that incorporates terminal type information is recognized. Further, the IP-PBX 10 accesses the read information / type table (see FIG. 7) by using the terminal type information inserted in the extension header of the INVITE message as a key, and transmits the unique information related to the terminal type information in the IAM signal. This unique information is included in the previously obtained IAM signal. As described above, the IAM signal in which the unique information (terminal type information) is inserted is transmitted to the IP-PBX 10A that accommodates the extension terminal as the destination No. 7 Send out via common line 21.

  The IP-PBX 10A that accommodates the destination extension terminal performs incoming processing according to the terminal type edited in the unique information of the IAM signal.

(A-3) Effect of the embodiment According to the above-described embodiment, no. 7 The incoming call from the SIP private line via the common line can be recognized as an incoming call for each terminal type. 7 The incoming call from the common line can be recognized as an incoming call for each terminal type, and convenience can be improved by extending the service using the incoming call recognition function for each terminal type.

(B) Other Embodiments In the above embodiment, the switching apparatus is an IP-PBX. However, the present invention is not limited to the IP-PBX, and the SIP is used as an interface unit for call control signals. The technical idea of the present invention can be applied to any switching device having an interface unit that terminates a call control signal line for sending and receiving messages and an interface unit that terminates a call control signal line according to a common line system.

  In the above embodiment, the one having the routing label / condition table 14A and the condition / reading location table 14B is shown, but instead of the routing label / condition table 14A and the condition / reading location table 14B, the routing label / condition table 14A and the condition are read. A table in which the reading location table 14B is merged may be applied. That is, a table in which routing labels and reading locations are directly associated may be applied.

  DESCRIPTION OF SYMBOLS 10, 10A, 10B1-10B3 ... IP-PBX, 11 ... Interface part, 12 ... Port part, 13 ... Call control part, 13A ... Call control signal conversion part, 14 ... Memory | storage part, 14A ... Routing label / condition table, 14B ... condition / reading location table, 14C ... reading information / type table.

Claims (3)

A first interface unit that terminates a first call control signal line that transmits and receives a common line call control signal according to the common line system; and a second interface unit that terminates a second call control signal line that transmits and receives a SIP message; A first call control signal converter for converting the incoming common line call control signal into a SIP message and transferring it, and a second call control signal converter for converting the incoming SIP message into a common line call control signal and transferring it An exchange device having
A plurality of routing labels for each common line call control signal are associated with information on any part of the fixed length area, variable length area, and option area including the terminal type information of the calling terminal for each common line call control signal. A first storage unit,
A second storage unit that associates the notation of the terminal type information of the calling terminal for each common line call control signal with the notation of the terminal type information of the calling terminal in the SIP message;
The first call control signal conversion unit accesses the first storage unit based on the routing label of the incoming common line call control signal to obtain location information, and from the corresponding location of the incoming common line call control signal. After obtaining the terminal type information of the calling terminal, the second storage unit is accessed to obtain the notation of the terminal type information of the calling terminal in the SIP message, and the notation is inserted into a predetermined location of the SIP message.
The second call control signal conversion unit determines a routing label to be inserted into the common line call control signal based on the information of the destination terminal in the incoming SIP message, and stores the first storage unit based on the routing label. In the common line call control signal obtained by accessing the second storage unit by notation of the terminal type information of the originating terminal of the incoming SIP message to the corresponding part of the common line call control signal An exchange device characterized by inserting a description of terminal type information of a calling terminal.   2. The exchange apparatus according to claim 1, wherein the exchange apparatus is an IP-PBX. A first interface unit that terminates a first call control signal line that transmits and receives a common line call control signal according to the common line system; and a second interface unit that terminates a second call control signal line that transmits and receives a SIP message; A computer mounted on an exchange device having
A plurality of routing labels for each common line call control signal are associated with information on any part of the fixed length area, variable length area, and option area including the terminal type information of the calling terminal for each common line call control signal. A first storage unit,
A second storage unit that associates the notation of the terminal type information of the calling terminal for each common line call control signal with the notation of the terminal type information of the calling terminal in the SIP message;
An incoming common line call control signal is converted into a SIP message and transferred, and the location information is obtained by accessing the first storage unit based on the routing label of the incoming common line call control signal. After obtaining the terminal type information of the calling terminal from the corresponding part of the common line call control signal, the second storage unit is accessed to obtain the notation of the terminal type information of the calling terminal in the SIP message, and the notation is expressed as the SIP message. A first call control signal converter to be inserted at a predetermined location of
An incoming SIP message is converted into a common line call control signal and transferred, and a routing label to be inserted into the common line call control signal is determined based on information of a destination terminal in the incoming SIP message. Based on the above, the first storage unit is accessed to obtain location information, and the second storage unit is accessed by notation of the terminal type information of the originating terminal of the incoming SIP message at the corresponding location of the common line call control signal A call control signal conversion program that functions as a second call control signal conversion unit that inserts notation of terminal type information of a calling terminal in a common line call control signal obtained in this way.

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