JP2005191881A - VoIP SYSTEM AND VoIP TELEPHONE SET - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a VoIP system provided with SIP telephone sets capable of receiving holding cancellation without disconnecting a line put on hold even during communication on a line other than the line put on hold. <P>SOLUTION: In the VoIP system, the SIP telephone sets a18 to e22 and f25 to j29 adaptive to multiple lines to which a plurality of telephone numbers are allocated are connected through a network 13. In the case that the holding cancellation is requested from the SIP telephone set a18 on a holding side to the SIP telephone set f25 using the line other than the telephone number put on hold in the state of being put on hold, the SIP telephone set f25 on the side of being put on hold receives the holding cancellation request, then inversely sends a holding request to the SIP telephone set a18 on the holding side and puts it on hold. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a VoIP system and a VoIP telephone constituting the VoIP system.

  Currently, a VoIP (Voice over Internet Protocol) system (see Non-Patent Document 1), a so-called Internet telephone, is becoming widespread. As a typical call control protocol of this VoIP system, there is SIP (Session Initiation Protocol).

  SIP is based on the Internet specifications. For example, a URI (Universal Resource Identifier) can be used in addition to a telephone number to specify a partner, and a call control exchange is performed in a request-response manner similar to Web access. , Make good use of existing Internet technologies. When calling the other party, the confirmation work is performed only between the SIP telephone and the SIP server.

  At the time of holding, an INVITE indicating that the call is put on hold is sent to the other party, and the call is put on hold. Thus, unlike an analog telephone, the held side (the other party) confirms that the call has been put on hold and enters a held state, thereby realizing the hold.

  On the other hand, when canceling the hold, an INVITE signifying the release of the hold is sent to the other party to restore the call.

  Patent Document 1 discloses a line hold system that prevents the line on the holdee side from being monopolized during hold. Specifically, when a hold request is sent from the terminal during communication between the terminal and the server, the second virtual circuit connected to the terminal is set to the hold state by the switching means provided in the exchange means, Further, the real line connected to the second virtual line connected to the terminal is released by the control means provided in the server.

Thereafter, when a hold release request is sent from the terminal, the second virtual line connected to the terminal is set to the use state by the switching means, and the second virtual line connected to the terminal is set by the control means. And the first virtual line are connected via a real line.
Japanese Patent Laid-Open No. 10-304061 Nikkei NETWORK (2002.6 p.51-p.69)

  However, in the case of a SIP phone that supports multiple lines by assigning a plurality of telephone numbers, the number that is received or held on a line other than the held number after being put on hold by the other party If the other party requests a hold release while the other party is using a line other than the line on hold, such as calling from a line other than The call cannot be restored after being accepted. Therefore, in order to continue the hold, a method of sending a signal rejecting the hold request to the other party can be considered. However, since the correspondence is not prescribed in SIP, the other party's operation when the hold release request is received However, depending on the other party's action, there was a problem that an error was returned and the user was disconnected.

  In view of the above problems, an object of the present invention is to provide a VoIP telephone that can accept a hold release without disconnecting the held line even when a call is being made on a line other than the held line. It is another object of the present invention to provide a VoIP system using the VoIP telephone.

  In order to achieve the above object, the present invention provides a VoIP system in which a multi-line VoIP telephone to which a plurality of telephone numbers are assigned is connected via a network, and a telephone that is held in a held state. If a phone that is using a line other than the number receives a hold release request from the hold-side phone, the hold-side phone accepts the hold release request, and then reversely sends a hold request to the hold-side phone. It is characterized by being sent and put on hold.

  Further, the present invention is a multi-line compatible VoIP telephone to which a plurality of telephone numbers are assigned, and when there is a hold release request while using a line other than the telephone number being held in a held state, On the contrary, after receiving the hold release request, a hold request is sent and held.

  According to these configurations, the call remains apparently on hold. However, in reality, the hold-side telephone once receives a hold release from the hold-side telephone and then makes a hold request, so the hold side and the hold side are switched.

  According to the present invention, since the hold release request of the hold-side telephone is not rejected, the call on hold is not disconnected. Further, during the operation of accepting the release of hold and holding it in reverse, no operation is required on the held-side telephone, so that the burden on the user is not increased.

  FIG. 1 is a block diagram showing the configuration of the VoIP system. The VoIP system 10 is one of SIP servers that provide various services to the in-house LANs 11 and 12, the in-house LANs 11 and 12 such as the relationship between the head office and the branch, the network 13 that connects the in-house LANs 11 and 12, and 1 and second proxy servers 14 and 15.

  For example, a VPN (Virtual Private Network) can be used between the in-house LANs 11 and 12.

  The in-house LAN 11 includes a NAT 17 connected to the network 13 and multi-line compatible SIP telephones a18 to e22 connected to the NAT 17 and assigned with a plurality of telephone numbers. Similarly, the in-house LAN 12 includes the NAT 24 and the SIP telephone. f25 to j29.

  The NAT 17 has a function of converting a global IP address and a private IP address used internally, and can be supported by a router, firewall software, or the like.

  If the first proxy server 14 is faulty and cannot be connected, the second proxy server 15 is connected. In the following description of the operation, the operation of the proxy server is omitted for the sake of simplicity. Further, if the Call ID of each SIP telephone is known, a proxy server is not always necessary.

  FIG. 2 is a sequence diagram showing the operation of the VoIP system 10. The call establishment procedure uses a technique similar to DNS, which is common on the Internet. For example, when making a call from the SIP telephone a18 to the SIP telephone f25, first, the SIP telephone a18 sends an “INVITE” message to the SIP telephone f25 to request connection. In response, the SIP telephone f25 returns “100 Trying”, “180 Ringing”, and “200 OK” messages, and the SIP telephone a18 responds with an ACK (acknowledgement) in response to this message, so that the call starts.

  When a hold button (not shown) of the SIP telephone a18 is pressed during a call, the SIP telephone a18 sends an “INVITE (Hold)” message to the SIP telephone f25 to request the hold. If the SIP telephone f25 returns a “200 OK” message, the call is put on hold. Here, the SIP telephone a18 that requested the hold is called the hold side, and the held SIP telephone f25 is called the hold side.

  When an “INVITE” message is sent from the SIP telephone j29 to the SIP telephone f25 in such a held state, that is, when there is a call connection request, since the VoIP system 10 is multiline compatible, the SIP telephone f25 “100 Trying”, “180 Ringing”, and “200 OK” messages are returned to allow the call. If the SIP telephone j29 returns ACK to this, the call is established and a call state is established.

  In this way, the SIP telephone f25 can make a call with the SIP telephone j29 while the call with the SIP telephone a18 is put on hold. In this state, when the hold release button (common to the hold button) of the SIP telephone a18 is pressed, the SIP telephone a18 sends an “INVITE (hold release)” message to the SIP telephone f25 to request release of the hold. In response to this, the SIP telephone f25 returns a “200 OK” message and accepts the hold release request. Subsequently, the SIP telephone set f25 sends an “INVITE (Hold)” message to the SIP telephone set a18 to request a hold. If the SIP telephone a18 returns a “200 OK” message to this, the call is apparently put on hold.

  Actually, after the SIP telephone f25 once accepts the hold release from the SIP telephone a18, the SIP telephone f25 makes a hold request to the SIP telephone a18. Therefore, the SIP telephone f25 becomes the holding side and the SIP telephone a18 becomes the held side.

  As described above, since the hold release request of the SIP telephone a18 is not rejected, the call between the SIP telephone a18 and the SIP telephone f25 is not disconnected. In addition, during the operation of accepting the hold release and holding the reverse, no operation is required on the SIP telephone f25 side, so that the burden on the user is not increased.

  Thereafter, when the call between the SIP telephone f25 and the SIP telephone j29 is finished and the hold release button (common with the hold button) of the SIP telephone f25 is pressed, the hold between the SIP telephone f25 and the SIP telephone a18 is released.

  As a terminal of the VoIP system of the present invention, a multi-line compatible VoIP telephone is used, and a SIP telephone or the like can be used as the VoIP telephone.

It is a block diagram which shows the structure of a VoIP system. It is a sequence diagram which shows operation | movement of a VoIP system.

Explanation of symbols

10 VoIP system 11, 12 In-house LAN
13 Network 17, 24 NAT
18-22, 25-29 SIP telephone

Claims (2)

A VoIP system in which multi-line compatible VoIP telephones to which a plurality of telephone numbers are assigned is connected via a network,
If the phone on hold uses a line other than the phone number on hold and there is a hold release request from the phone on hold,
The held-side telephone, after accepting the hold-release request, sends a hold request to the hold-side telephone and holds it on the contrary. A multi-line VoIP phone with a plurality of telephone numbers assigned,
If there is a hold release request while using a line other than the phone number that is on hold in the held state,
A VoIP telephone characterized in that, after accepting the hold release request, a hold request is sent and held on the contrary.

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