JP2005167592A - PARK SERVER, SIP TELEPHONE, AND VoIP SYSTEM PROVIDED WITH THEM - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a VoIP system which realizes a park function, using a park server. <P>SOLUTION: The VoIP system 10 comprises a park server 16 having a plurality of allotted park numbers, SIP telephones a18-e22 having a plurality of park keys each having some allotted park numbers, an NAT 17 for connecting the SIP telephones a18-e22 to the park server 16 and an internet 13, and a first and second proxy servers 14, 15 connected to the internet 13. When the park key of the SIP telephone being busy is pushed down, the SIP telephone informs the park server 16 of the park number allotted to the park key via the first or second proxy server 14, 15 and transfers a call to the park number to park. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a VoIP system using a SIP protocol, a SIP telephone and a park server 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.

  FIG. 5 is a block diagram showing a configuration of a conventional VoIP system. The VoIP system 100 is one of SIP servers that provide various services to the in-house LANs 110 and 120, the Internet network 130 that connects the in-house LANs 110 and 120, and the in-house LANs 110 and 120. The first and second proxy servers 140 and 150 are configured.

  The internal LAN 110 includes a NAT (Network Address Translation) 170 connected to the Internet network 130 and SIP telephones A180 to E220 connected to the NAT 170. Similarly, the internal LAN 120 includes a NAT 240 and SIP telephones F250 to SIP. And a telephone J290.

  The call establishment procedure uses a method similar to DNS (domain name system) common in the Internet. For example, when making a call from the SIP telephone A180 to the SIP telephone F250, first, the SIP telephone A180 sends an “INVITE” message to the first or second proxy server 140, 150 to request connection with the SIP telephone F250. The first or second proxy server 140, 150 sends an “INVITE” message to the SIP telephone F250. In response, SIP telephone F250 returns a “200 OK” message, and SIP telephone A180 responds with an ACK (acknowledgement) for this message.

In addition, SIP control includes control called Call Pickup. A group SIP phone can have a unique primary number and a shared group sub-number (park number). There can be a plurality of sub-numbers, and an independent group can be formed. If there is an incoming call to the main number, only that SIP telephone will ring. When an incoming call is received at the sub-number, the SIP telephone belonging to the incoming group rings. And even if it is a SIP telephone of the group which is not ringing by Call Pickup, if the incoming sub-number is input and a pickup operation is performed, a call can be made in response to this incoming call (Non-Patent Document). 2).
Nikkei NETWORK (2002.6 p.51-p.69) Internet HYPERLINK "URL: http: //www.softfront.co.jp/tech/ietfdoc/trans/draft-ietf-sipping-service-examples-04j.txt" URL: http: //www.softfront.co.jp /tech/ietfdoc/trans/draft-ietf-sipping-service-examples-04j.txt

  Here, in order to switch the call between SIP phone A and SIP phone B to the call between SIP phone A and SIP phone C using Non-Patent Document 2, SIP phone C knows Call ID and Tag of SIP phone A. Need to be. However, Call ID and Tag have several tens to several hundreds of digits, which is difficult to realize.

  An object of this invention is to provide the VoIP system which implement | achieves a park function using a park server. It is another object of the present invention to provide a park server and a SIP telephone that constitute the system.

  To achieve the above object, the present invention provides a park server to which a plurality of park numbers are assigned, one or more SIP telephones connected to a network and having a plurality of park keys to which some of the park numbers are assigned, respectively. A VoIP system including one or more proxy servers connected to a network, and when a park key of a SIP phone in a call is pressed, the SIP phone is assigned to the park key via the proxy server. The park number is notified to the park server, and a call is transferred to the park number to be parked.

  Thus, by installing the park server in the office or the like, the park function can be easily realized in the VoIP system.

  Further, in the VoIP system, each of the SIP telephones includes notification means for visually informing whether or not a call is parked at a park number assigned to a park key, and each of the SIP telephones periodically includes the proxy. When a subscribe signal is transmitted to the park server via a server, and the call is parked or the park call is disconnected, the park server notifies each SIP phone to that effect and receives the notification. Each SIP telephone is configured to activate the corresponding notification means when a call is parked.

  With this configuration, the user can know the usage status of the park number by looking at the on / off of the park key of each SIP telephone.

  Further, in the VoIP system, when a park key corresponding to an operating notification means is pressed, the SIP telephone is configured to pick up a park call.

  With this configuration, the user can easily receive a park call.

  The present invention is also a park server connected to one or more SIP telephones having a plurality of park keys to which park numbers are assigned, and connected to one or more proxy servers via a network. When the park key of the SIP phone that has all of the assigned park numbers and is in a call is pressed, the park number assigned to the park key transmitted from the SIP phone via the proxy server is received. The call is parked at the park number.

  The park server receives a subscribe signal from any of the SIP telephones via the proxy server, and notifies each SIP telephone when the call is parked or the park call is disconnected. It can be configured.

  Further, in the above park server, when any of the SIP telephones picks up the parked call, the parked call is disconnected, and all SIP telephones sharing the park number are notified of the disconnection of the park call. Can do.

  The present invention is also a SIP telephone connected to a park server to which a plurality of park numbers are assigned and connected to one or more proxy servers via a network, and some of the park numbers are assigned respectively. When the park key is pressed during a call, the park number assigned to the park key is notified to the park server via the proxy server, and the call is transferred to the park number. And park.

  In the SIP telephone set, a notification means for visually notifying whether or not a call is parked at a park number assigned to a park key is provided, and a subscribe signal is periodically sent to the park server via the proxy server. When a call is parked to a park number that is transmitted and shared, or when a park call is disconnected, a message to that effect is received from the park server, and when the call is parked, the corresponding notification means is activated. It can be set as the structure made to do.

  Further, in the above SIP telephone set, a park call can be picked up when a park key corresponding to an operating notification means is pressed.

  According to the present invention, it is possible to easily realize the park function in the VoIP system by installing the park server in the office or the like. As a result, the usability of the SIP telephone is improved.

  FIG. 1 is a block diagram showing the configuration of the VoIP system of the present invention. The VoIP system 10 is an in-house LAN 11, 12 like a relationship between a head office and a branch office, an Internet network 13 that is a network connecting the in-house LANs 11, 12, and a SIP server that provides various services to the in-house LANs 11, 12. The first and second proxy servers 14 and 15 are one.

  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 Internet network 13, a park server 16 connected to the NAT 17, SIP telephones a18 to e22 connected to the NAT 17, and a park server 16 to which a plurality of park numbers are assigned. Similarly, the in-house LAN 12 includes a NAT 24, a park server 23, and SIP telephones f25 to j29.

  The park number is a telephone number for parking (holding) a call, and a plurality of telephones can share the same park number. For example, the SIP telephones a18 to e22 can share the park numbers 0001 to 0005, and the SIP telephones f25 to j29 can share the numbers 0006 to 0010.

  The SIP telephones a18 to e22 and f25 to j29 are each provided with a plurality of park keys (not shown) to which park numbers are assigned. By pressing the park key, a call can be parked or a parked call (park call) can be picked up. The park key emits light from a lamp such as an LED. When the park number assigned to the park key is used, the park key is lit. When the park number assigned to the park key is not used, the park key is turned on. The park key is turned off. In addition to the LED, an LCD or the like may be used as long as it is a notification means that visually notifies whether or not a call is parked at a park number assigned to a park key. The park call is a call transferred to a designated park number.

  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.

  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 first proxy server 14 to request connection with the SIP telephone f25. The first proxy server 14 sends an “INVITE” message to the SIP telephone f25. If the SIP telephone f25 returns a “200 OK” message and the SIP telephone a18 responds with an ACK to the message, the telephone call starts.

  If the first proxy server 14 is faulty and cannot be connected, the second proxy server 15 is connected.

  Each SIP telephone set a18 to e22 or f25 to j29 transmits a subscribe signal to the park server 16 or 23 periodically (for example, every hour) to make a subscription.

  FIG. 2 is a sequence diagram showing the activation of the subscription. The SIP telephone a18 is illustrated as an example. First, the SIP telephone a18 sends a “REGISTER” message to the first proxy server 14 and receives a “200 OK” message to ensure communication. Next, the SIP telephone a <b> 18 transmits a “SUBSCRIBE” message to the park server 16 via the first proxy server 14. The “SUBSCRIBE” message includes a park number shared by the SIP telephone a18. In response to this, the park server 16 issues a “200 OK” message, and if the usage of the park number changes (when the call is parked or the park call is disconnected), a “NOTIFY” message is displayed. 1 to the SIP telephone a 18 via the proxy server 14. The “NOTIFY” message includes the usage status of each park number. In response to this, the SIP telephone a 18 transmits a “200 OK” message to the park server 16 via the first proxy server 14.

  Through such communication, each SIP telephone can know the usage status of each park number. When the call is parked or the park call is disconnected, each SIP phone that has received the notification lights up the park key when the park number assigned to the park key is being used. When the park number assigned to is not used, the park key is turned off.

  Therefore, the user can know the usage status of the park number by seeing whether the park key is turned on or off.

  Next, the park operation will be described. When the park key of the SIP telephone in a call is pressed, the SIP telephone can park the call by transferring the call to a park server having the park number assigned to the park key as a telephone number. The park server operates as a terminal (SIP telephone) as seen from the proxy server. When parking a call, the park server transfers the call to a telephone number (park number) assigned to the park server.

  FIG. 3 is a sequence diagram showing the park operation. SIP telephones a18, b19, and c20 are illustrated as examples. Here, it is assumed that each of the SIP telephones a18, b19, c20 has a park key corresponding to a park number of 0001 to 0005.

  When the SIP telephone a19 and the SIP telephone b19 are in a call state and a park key (for example, 0001) of the SIP telephone b19 is pressed, a “REFER” message including that fact is sent to the first proxy server 14. It is done. In response to this, the first proxy server 14 sends this “REFER” message to the terminal having the number 0001, that is, the park server 16. Then, the park server 16 transmits a “202 Accepted” message and a “NOTIFY” message to the SIP telephone b 19 via the first proxy server 14. In response to this, the SIP telephone b19 transmits a “200 OK” message to the park server 14 via the first proxy server 14.

  Subsequently, the park server 14 transmits an “INVITE (Replace)” message to the SIP telephone set a 18 via the first proxy server 14. In response to this, the SIP telephone a 18 transmits a “200 OK” message to the park server 14 via the first proxy server 14. Further, the park server 14 returns an ACK for this message. As a result, the call of the SIP telephone a18 is parked, and the park server 14 transmits “RTP Music” to the SIP telephone a18.

  Thereafter, the SIP telephone a18 transmits a “BYE” message to the SIP telephone b19 via the first proxy server 14. The park server 16 transmits a “NOTIFY” message to the first proxy server 14. The SIP telephone b19 transmits a “200 OK” message to the first proxy server 14. The first proxy server 14 transmits a “NOTIFY” message to the SIP telephone b19. The SIP telephone b19 transmits a “200 OK” message to the SIP telephone a18 via the first proxy server 14. As a result, the SIP telephone b19 is disconnected from the SIP telephone a18.

  Thereafter, when the park server 16 receives the “200 OK” message from the first proxy server 14, it sends a “NOTIFY (Parked)” message via the first proxy server 14 to notify that the call is parked. To the SIP telephones b19 and c20 sharing the park number. This “NOTIFY (Parked)” message includes the CALL ID and Tag of the SIP telephone a18.

  In response to this, the SIP telephones b19 and c20 transmit a “200 OK” message to the first proxy server 14. Then, the first proxy server 14 returns a “200 OK” message to the park server 16. Thereby, the park operation between the terminals is completed.

  Subsequently, in the SIP telephones b19 and c20, the park key corresponding to the 0001 park number lights up. Therefore, the user can know that the call is parked at the number 0001 when the park key is turned on.

  Next, park call pickup will be described. When the illuminated park key is pressed, the SIP telephone picks up the park call.

  FIG. 4 is a sequence diagram showing a pick-up operation of a park call. FIG. 4 shows a state continued from FIG. That is, the telephone call of the SIP telephone a18 is parked in the park server 16.

  In this state, when the park key (0001) that is lit on the SIP telephone c20 is pressed, the SIP telephone c20 uses the received CALL ID and Tag to send an “INVITE (Replace)” message to the first. It transmits to the proxy server 14 and requests a replacement from the park server to the SIP telephone c20. The proxy server 14 returns a “100 Trying” message to the SIP telephone c20 and transmits an “INVITE (Replace)” message to the SIP telephone a18. The SIP telephone a18 transmits a “200 OK” message to the SIP telephone c20 via the first proxy server 14. Further, the SIP telephone c20 returns an ACK for this message. Thereby, the SIP telephone a18 and the SIP telephone c20 are connected.

  Subsequently, the SIP telephone a 18 transmits a “BYE” message to the park server 16 via the first proxy server 14. In response to this, the park server 16 returns a “200 OK” message to the SIP telephone a 18 via the first proxy server 14. As a result, the SIP telephone set a18 is disconnected from the park server 16.

  Then, the park server 16 transmits a “NOTIFY (terminated)” message to the effect that the disconnection from the SIP telephone a18 is completed to the SIP telephones b19 and c20 via the first proxy server 14.

  In response to this, the SIP telephones b19 and c20 transmit a “200 OK” message to the first proxy server 14. Then, the first proxy server 14 returns a “200 OK” message to the park server 16. Thereby, the pick-up operation between terminals is completed.

  Subsequently, in the SIP telephone c20, the park key corresponding to the 0001 park number lights up in a color different from the park call state. Therefore, the user can know that the line is connected by confirming that the park key lighting color is different.

  On the other hand, in the SIP telephone b19, the park key corresponding to the 0001 park number is turned off.

  By installing the park server in-house as in the above embodiment, the park function can be easily realized in the VoIP system.

  The SIP telephone and the park server of the present invention are used for a VoIP system, and the VoIP system can be effectively used for a telephone system in which calls are frequently transferred, for example, in-house extension telephones.

It is a block diagram which shows the structure of the VoIP system of this invention. It is a sequence diagram which shows starting of the subscription of this invention. It is a sequence diagram which shows the park operation | movement of this invention. It is a sequence diagram which shows the pick-up operation | movement of the park call of this invention. It is a block diagram which shows the structure of the conventional VoIP system.

Explanation of symbols

10 VoIP system 11, 12 In-house LAN
13 Internet Network 14 First Proxy Server 15 Second Proxy Server 16, 23 Park Server 17, 24 NAT
18-22, 25-29 SIP telephone

Claims (9)

A park server to which a plurality of park numbers are assigned; one or more SIP phones connected to a network and having a plurality of park keys to which some of the park numbers are assigned; and one or more proxy servers connected to the network; A VoIP system comprising:
When the park key of the SIP telephone in a call is pressed, the SIP telephone notifies the park server of the park number assigned to the park key via the proxy server, and transfers the call to the park number. VoIP system characterized by park. Each of the SIP telephones includes an informing means for visually informing whether or not a call is parked at a park number assigned to a park key,
Each SIP phone periodically sends a subscribe signal to the park server via the proxy server,
When a call is parked or a park call is disconnected, the park server notifies each SIP phone to that effect,
2. The VoIP system according to claim 1, wherein each SIP telephone that has received the notification activates the corresponding notification means when a call is parked. 3. The VoIP system according to claim 2, wherein the SIP telephone picks up a park call when a park key corresponding to an operating notification means is pressed. A park server connected to one or more SIP phones having a plurality of park keys to which a park number is assigned and connected to one or more proxy servers via a network;
Have all of the park numbers assigned to each SIP phone,
When the park key of the SIP telephone in a call is pressed, the park number assigned to the park key transmitted from the SIP telephone through the proxy server is received and the call is parked at the park number. A featured park server. Receiving a subscribe signal from any of the SIP telephones via the proxy server;
5. The park server according to claim 4, wherein when the call is parked or the park call is disconnected, the SIP server is notified of the fact. When any of the SIP phones picks up the parked call, the parked call is disconnected,
6. The park server according to claim 4 or 5, wherein the disconnection of the park call is notified to all SIP telephones sharing the park number. A SIP phone connected to a park server to which a plurality of park numbers are assigned and connected to one or more proxy servers via a network,
Several of the park numbers each have a plurality of assigned park keys;
When a park key is pressed during a call, the park number assigned to the park key is notified to the park server via the proxy server, and the call is transferred to the park number to be parked. SIP phone. A notification means for visually informing whether or not the call is parked at the park number assigned to the park key;
Periodically send a subscribe signal to the park server via the proxy server,
When a call is parked to a shared park number or when a park call is disconnected, a message to that effect is received from the park server,
8. The SIP telephone set according to claim 7, wherein when the call is parked, the corresponding notification means is activated. 9. The SIP telephone set according to claim 8, wherein a park call is picked up when a park key corresponding to an operating notification means is pressed.

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