JP2008098738A - Inter-base bypass connection system - Google Patents

Inter-base bypass connection system Download PDF

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JP2008098738A
JP2008098738A JP2006275085A JP2006275085A JP2008098738A JP 2008098738 A JP2008098738 A JP 2008098738A JP 2006275085 A JP2006275085 A JP 2006275085A JP 2006275085 A JP2006275085 A JP 2006275085A JP 2008098738 A JP2008098738 A JP 2008098738A
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connection
bases
voice
network
line network
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Yuichi Machida
祐一 町田
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NEC Engineering Ltd
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NEC Engineering Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that when a speech traffic/use band allocated to each base exceeds a limit value during telephone calling between bases on a VoIP network, speech quality is deteriorated and connection is restricted in order to prevent the deterioration, thus hindering inter-base communication. <P>SOLUTION: A speech connection device 2 controls telephone set devices 3a and 3n installed at bases on the VoIP network 1, gateway devices 4a and 4n connected to a leased line network 6, and gateway devices 5a and 5n connected to a public line network 7. The speech connection device 2 manages a use value of a speech traffic/use band between the bases, and when the use value of a speech traffic/use band exceeds a previously set limit value, for example, when the telephone set device 3a at the base (a) calls the telephone set device 3n at the base (a), the speech connection device 2 connects gateway devices according to a transfer connection number allocated to the telephone set device 3n of the called destination to establish bypass connection via the leased line network 6 or the public line network 7, thereby preventing deterioration in speech quality. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、ＶｏＩＰネットワーク上で、電話機装置およびゲートウェイ装置が複数の拠点に設置され、これを制御する音声接続装置における拠点間迂回制御方式に関する。   The present invention relates to an inter-site detour control method in a voice connection apparatus that controls telephone sets and gateway devices installed at a plurality of sites on a VoIP network.

従来、ＶｏＩＰネットワーク上では、伝送される音声パケットには伝送品質が要求され、音声品質を確保するためには、伝送遅延やパケット欠落をできるだけ少なくする必要がある。
ＶｏＩＰネットワーク上における音声パケットの伝送帯域保証方式に関しては、特許文献１や特許文献２に開示されている。
特許文献１では、ＶｏＩＰネットワーク上の電話機装置およびゲートウェイ装置を制御するゲートキーパ装置において、時間帯での呼制御制限、電話機装置の接続数の制限、時間帯での呼接続停止、電話機装置の呼接続停止機能を持ち、伝送帯域を確保して安定したデータ通信を可能にしている。
特許文献２では、ＶｏＩＰネットワーク上において、ＶｏＩＰ端末間の音声トラヒックをトラヒック管理装置にて管理することで、新規呼設定に対し、使用可音声帯域の割当が出来ない場合は、呼の確立を拒否し、音声パケットの伝送帯域保証を行っている。
また、ＩＰネットワーク障害やＶｏＩＰ電話制御端末通信障害を検出した場合の公衆網への迂回通話に関しては、特許文献３に開示されている。
特許文献３では、ＶｏＩＰネットワーク上において、ＩＰネットワークを含めたＩＰ電話に障害が生じたときには、従来の公衆交換電話網を用いた固定電話によってその障害をバックアップしようとするものである。またＶｏＩＰ通話パケット優先転送制御部でのＴＯＳフィールド制御により音声パケットの優先制御を可能としている。 Conventionally, on a VoIP network, transmission quality is required for a voice packet to be transmitted, and in order to ensure voice quality, it is necessary to minimize transmission delay and packet loss.
Patent Document 1 and Patent Document 2 disclose a transmission bandwidth guarantee method for voice packets on a VoIP network.
In Patent Document 1, in a gatekeeper device that controls a telephone device and a gateway device on a VoIP network, call control restriction in a time zone, restriction on the number of connection of telephone devices, call connection suspension in a time zone, call connection of a telephone device It has a stop function and secures a transmission band to enable stable data communication.
In Patent Document 2, if a voice management unit manages voice traffic between VoIP terminals on a VoIP network, the establishment of a call is rejected when a usable voice band cannot be allocated for a new call setting. The transmission bandwidth of voice packets is guaranteed.
Further, Patent Document 3 discloses a detour call to a public network when an IP network failure or a VoIP telephone control terminal communication failure is detected.
In Patent Document 3, when a failure occurs in an IP telephone including an IP network on a VoIP network, the failure is backed up by a fixed telephone using a conventional public switched telephone network. In addition, voice packet priority control is enabled by TOS field control in the VoIP call packet priority transfer control unit.

特開２００２−１６４９２０JP 2002-164920 A 特開２００３−３４８１３７JP2003-348137 特開２００６−１４０７１JP 2006-14071 A

しかしながら、上記の従来技術には以下に示す問題点がある。
第１の問題点は、特許文献１および特許文献２において、ＶｏＩＰネットワーク上の電話機装置およびゲートウェイ装置の呼接続にて、時間帯や電話機装置の接続数、または音声トラヒック／使用帯域の状況により、呼接続を拒否、制限しており、緊急の要件があっても、これを伝えることが出来ない。その理由は、音声の伝送帯域確保や保証のため、呼接続を規制し、音声パケットの発生を抑えるためである。
第２の問題点は、特許文献３において、ＶｏＩＰ交換機およびＶｏＩＰ電話制御端末間での通信障害を検知しての公衆交換電話網への迂回通話を可能とするものであり、音声パケットの優先制御のみでは、割当てられた帯域を越えた音声通話が発生した場合に、音声品質の劣化が発生する。
そこで、本発明の第一の目的は、ＶｏＩＰネットワーク上で音声トラヒック／使用帯域を監視し、音声の伝送帯域確保や保証を行いながら、電話機装置およびゲートウェイ装置間の接続を規制せずに呼接続の継続を可能とすることである。
また、本発明の第２の目的は、公衆回線網と接続するゲートウェイ装置および専用回線網と接続するゲートウェイ装置を持つ場合に、専用回線網を優先選択し、専用回線の全回線話中の場合には、公衆回線網を使用し呼接続を可能とすることである。
さらに、本発明の第３の目的は、ＶｏＩＰネットワーク上のみでの拠点間接続が行えるクラス、ＶｏＩＰネットワーク上での音声の伝送帯域不足の場合は、専用回線網を使用しての拠点間接続が行えるクラス、専用回線が全回線話中の場合は、公衆回線網を使用しての拠点間接続行えるクラスを、各電話機装置に割り当てることを可能とすることである。 However, the above prior art has the following problems.
The first problem is that in Patent Document 1 and Patent Document 2, in the call connection between the telephone device and the gateway device on the VoIP network, depending on the time zone, the number of telephone devices connected, or the state of voice traffic / bandwidth used, Call connections are rejected and restricted, and even if there are urgent requirements, this cannot be communicated. The reason is to restrict call connection and suppress the generation of voice packets in order to secure and guarantee the voice transmission band.
The second problem is that in Patent Document 3, it is possible to make a detour call to the public switched telephone network by detecting a communication failure between the VoIP exchange and the VoIP telephone control terminal. However, when a voice call exceeding the allocated bandwidth occurs, the voice quality deteriorates.
Therefore, the first object of the present invention is to monitor the voice traffic / bandwidth used on the VoIP network and secure and guarantee the voice transmission bandwidth, while not restricting the connection between the telephone device and the gateway device. It is possible to continue.
The second object of the present invention is to preferentially select a dedicated line network when a gateway apparatus connected to a public line network and a gateway apparatus connected to a dedicated line network are used, and all lines of the dedicated line are busy. In other words, it is possible to make a call connection using a public network.
Furthermore, the third object of the present invention is to provide a class that can be connected between bases only on the VoIP network. In the case where the voice transmission band is insufficient on the VoIP network, the connection between the bases using a dedicated network is possible. When a class that can be performed and all dedicated lines are busy, a class that can be connected between bases using the public line network can be assigned to each telephone device.

そこで本発明は、上記の課題を解決するために、ＶｏＩＰネットワークと、電話機装置と専用回線網接続用ゲートウェイ装置と公衆回線網接続用ゲートウェイ装置とを備えた複数の拠点と、前記複数の拠点間の音声接続制御を行う音声接続装置とを備え、前記複数の拠点と前記音声接続装置とは前記ＶｏＩＰネットワークに接続され、前記音声接続装置は、前記複数の拠点間で前記ＶｏＩＰネットワークを介して音声通話接続が行われたとき、前記複数の拠点間の音声トラヒック／使用帯域を監視する手段と、前記音声トラヒック／使用帯域が予め設定された限界値を超えたとき、前記専用回線網接続用ゲートウェイ装置または前記公衆回線網接続用ゲートウェイ装置によって専用回線網または公衆回線網を介した音声通話接続に切替える手段とを備えていることを特徴とする。   Therefore, in order to solve the above-described problems, the present invention provides a plurality of bases each including a VoIP network, a telephone device, a dedicated line network connection gateway device, and a public line network connection gateway device, and the plurality of base points. A plurality of bases and the voice connection device are connected to the VoIP network, and the voice connection device performs voice communication between the plurality of bases via the VoIP network. Means for monitoring the voice traffic / bandwidth used between the plurality of bases when a call connection is made; and the gateway for connecting the dedicated line network when the voice traffic / bandwidth exceeds a preset limit value Switching to voice call connection via a private line network or public line network by the apparatus or the public line network connection gateway apparatus Characterized in that it comprises and.

本発明は、以上の手段によって次に示す効果を奏する。
第１の効果は、 ＶｏＩＰネットワーク上で、拠点間の音声トラヒック／使用帯域が増大しても、拠点間接続通話の音声品質を劣化させないことが出来る。
その理由は、 音声トラヒック／使用帯域を監視し、予め設定の限界値と比較し、限界値を越えた場合には、自拠点設置のゲートウェイ装置を接続し、専用回線網経由または公衆回線網経由を使用した迂回接続にて拠点間接続を可能にしたことにある。
第２の効果は、 拠点間の音声トラヒック／使用帯域が限界値を越えたとしても、拠点間接続を規制することなく、通話接続を継続させることが出来る。
その理由は、自拠点設置のゲートウェイ装置を接続し、専用回線網経由または公衆回線網経由を使用した迂回接続にて拠点間接続を可能にしたことにある。
第３の効果は、 拠点間の音声トラヒック／使用帯域が限界値を越えた場合に、専用回線網経由または公衆回線網経由の拠点間通話接続による回線輻輳を防止することが出来る。その理由は、電話機装置毎にクラス情報を付与し、自拠点設置のゲートウェイ装置接続の有効／無効を決めれることを可能にしたことにある。 The present invention has the following effects by the above means.
The first effect is that the voice quality of the inter-base connection call can be prevented from deteriorating even if the voice traffic / bandwidth between the bases increases on the VoIP network.
The reason is that the voice traffic / bandwidth used is monitored and compared with a preset limit value. If the limit value is exceeded, a gateway device installed at the local site is connected, via a dedicated line network or a public line network. It is that the connection between bases is made possible by the detour connection using.
The second effect is that the call connection can be continued without restricting the connection between the bases even if the voice traffic / bandwidth between the bases exceeds the limit value.
The reason is that the gateway device installed at the local site is connected, and the inter-base connection is made possible by the detour connection using the private line network or the public line network.
The third effect is that it is possible to prevent line congestion due to inter-site call connection via the dedicated line network or the public line network when the voice traffic / bandwidth used between the sites exceeds the limit value. The reason is that class information is given to each telephone device, and it is possible to determine whether the gateway device connection at the local site is valid / invalid.

《第一の実施形態》
[構成の説明]
次に、本発明の実施の形態について図面を参照して詳細に説明する。
図１は、本発明の実施例に関わる拠点間接続における自動迂回構成を示したブロック図である。音声接続装置２は、各拠点に設置の電話機装置３ａおよび３ｎと専用回線網６と接続するゲートウェイ装置４ａおよび４ｎ、公衆回線網７と接続するゲートウェイ装置５ａおよび５ｎをＶｏＩＰネットワーク１上にて制御し、拠点ａ、拠点ｎを構成している。
音声接続装置２の記憶部には、図２で示したＭ１、Ｍ２、Ｍ３の記憶領域を備えている。記憶領域Ｍ１には、拠点対応に使用中の音声トラヒック／使用帯域が格納され、音声品質が劣化せずに使用可能な音声トラヒック／使用帯域の限界値が格納され、拠点間迂回実行の判断に使用される。記憶領域Ｍ２には、電話機装置番号対応に持たれる、拠点間迂回接続時に使用される専用回線転送接続番号、および公衆回線転送接続番号が格納され、記憶領域Ｍ３には、電話機装置番号対応に持たれる、専用回線転送接続クラス、公衆回線転送接続クラスが格納されており、迂回接続実行時に、接続規制を受けるクラスの電話機装置か否かの判断で使用される。
[動作の説明]
次に例として、拠点間迂回動作につき、図３に示したフローチャートを用いて説明する。
電話機装置３ａおよび電話機装置３ｎは、それぞれ拠点ａと拠点ｎに設置され、ＶｏＩＰネットワーク１を介して音声接続装置２より制御される。音声接続装置２の記憶部には、各拠点間の音声通話接続で使用中の音声トラヒック／使用帯域が格納され、電話機装置３ａから電話機装置３ｎを呼出した場合に、それぞれが設置される拠点ａおよび拠点ｎ対応の音声トラヒック／使用帯域値が加算され、呼出しや応答通話が復旧した時点で減算が行われており、予め各拠点に割り当ててある音声トラヒック／使用帯域量が限界値として登録されている（Ｍ１）。また電話機装置番号対応に、専用回線転送接続番号、公衆回線転送接続番号（Ｍ２）および専用回線転送接続規制クラス、公衆回線転送接続規制クラス（Ｍ３）がそれぞれ予め登録されている。
拠点ａ設置の電話機装置３ａから拠点ｎ設置の電話機装置３ｎを呼出した場合に、記憶領域（Ｍ１）より、発信元の拠点ａおよび呼出し先の拠点ｎの音声トラヒック／使用帯域値と限界値を読み出す（ステップ１００）。そして使用中の音声トラヒック／使用帯域値と、予め設定してある使用限界値の比較を行う（ステップ１０１）。
（ステップ１０１）にて、使用中の音声トラヒック／使用帯域値が、限界値を越えていない場合は、ＶｏＩＰネットワーク１を介した拠点間の音声通話接続を行う（ステップ１０２）。
（ステップ１０１）にて、使用中の音声トラヒック／使用帯域値が、限界値を越えている場合は、記憶領域（Ｍ３）より、発信元の電話機装置３ａ対応の専用回線転送接続クラスを読み出し（ステップ１１０）、専用回線網６を使用した転送接続が規制されるクラスか判断する（ステップ１１１）。
（ステップ１１１）にて、専用回線転送接続が規制ではないクラスの場合には、記憶領域（Ｍ２）より、呼出し先の電話機装置３ｎ対応の専用回線への転送接続番号を読み出し（ステップ１１２）、専用回線に空きがあり、発信可能か判断する（ステップ１１３）。
（ステップ１１３）にて、専用回線に空きがあり発信可能な時は、ゲートウェイ装置４ａを使用した発信接続を行い（ステップ１１４）、専用回線網６を介した拠点ｎの電話機装置３ｎとの接続を行う。（ステップ１１１）にて専用回線転送接続が規制であるクラス、および（ステップ１１３）にて専用回線に空きが無く、発信不可能な場合は、記憶領域（Ｍ３）より、発信元の電話機装置３ａ対応の公衆回線転送接続クラスを読み出し（ステップ１２０）、公衆回線網７を使用した転送接続が規制されるクラスか判断する（ステップ１２１）。
（ステップ１２１）にて、公衆回線転送接続が規制ではないクラスの場合には、記憶領域（Ｍ２）より、呼出し先の電話機装置３ｎ対応の公衆回線への転送接続番号を読み出し（ステップ１２２）、公衆回線に空きがあり、発信可能か判断する（ステップ１２３）。
（ステップ１２３）にて、公衆回線に空きがあり発信可能な時は、ゲートウェイ装置５ａを使用した発信接続を行い（ステップ１２４）、公衆回線網７を介した拠点ｎの電話機装置３ｎとの接続を行う。
（ステップ１２１）にて公衆回線転送接続が規制であるクラス、および（ステップ１２３）にて公衆回線に空きが無く、発信不可能な場合は、発信元の電話機装置３ａに発信規制音を接続する。
なお、以上の説明では、拠点を拠点ａと拠点ｎの２拠点の構成の場合を例として説明したが、本発明はこのような構成に限定されるものではなく、拠点が３拠点以上であってもよい。
《第二の実施形態》
次に、本発明の第二の実施の形態について説明する。
音声接続装置が故障、またはＶｏＩＰネットワーク障害の場合に動作する、音声接続バックアップ装置を、ＶｏＩＰネットワーク上の各拠点に設置し、これにより各拠点の電話機装置およびゲートウェイ装置をバックアップ制御できる構成において、本発明のサービスを拠点間通信不可を条件に行うことで、専用回線網および公衆回線網を介した拠点間接続が可能と出来る。 First embodiment
[Description of configuration]
Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing an automatic detour configuration in inter-base connection according to an embodiment of the present invention. The voice connection device 2 controls, on the VoIP network 1, gateway devices 4a and 4n that connect the telephone devices 3a and 3n installed at each site to the private network 6 and gateway devices 5a and 5n that connect to the public network 7. The base a and base n are configured.
The storage unit of the voice connection device 2 includes the storage areas M1, M2, and M3 shown in FIG. The storage area M1 stores voice traffic / bandwidth in use corresponding to a base, stores a limit value of voice traffic / bandwidth that can be used without deterioration in voice quality, and determines whether to bypass between bases. used. The storage area M2 stores the dedicated line transfer connection number and the public line transfer connection number used for the detour connection between the bases, which is associated with the telephone device number, and the storage area M3 has the correspondence with the telephone device number. The private line transfer connection class and the public line transfer connection class are stored, and are used for determining whether or not the telephone device is a class subject to connection restrictions when performing a detour connection.
[Description of operation]
Next, as an example, the detour operation between bases will be described using the flowchart shown in FIG.
The telephone device 3 a and the telephone device 3 n are installed at the base a and the base n, respectively, and are controlled by the voice connection device 2 via the VoIP network 1. The storage unit of the voice connection device 2 stores the voice traffic / band used during the voice call connection between the respective bases. When the telephone device 3n is called from the telephone device 3a, each of the bases a in which each is installed. And the voice traffic / bandwidth used for site n is added and subtraction is performed when the call or answering call is restored, and the amount of voice traffic / bandwidth allocated to each site in advance is registered as the limit value. (M1). Also, a dedicated line transfer connection number, a public line transfer connection number (M2), a dedicated line transfer connection restriction class, and a public line transfer connection restriction class (M3) are registered in advance for the telephone device number.
When the telephone device 3n installed at the site n is called from the telephone device 3a installed at the site a, the voice traffic / use band value and the limit value of the source site a and the called site n are stored from the storage area (M1). Read (step 100). Then, the voice traffic / bandwidth value being used is compared with a preset threshold value (step 101).
If the voice traffic / bandwidth value being used does not exceed the limit value at (Step 101), a voice call connection between the bases via the VoIP network 1 is performed (Step 102).
In step 101, if the voice traffic / bandwidth value being used exceeds the limit value, the private line transfer connection class corresponding to the telephone device 3a as the caller is read from the storage area (M3) ( Step 110), it is determined whether the transfer connection using the leased line network 6 is a restricted class (Step 111).
In step 111, if the leased line transfer connection is not a restriction class, the transfer connection number to the leased line corresponding to the telephone apparatus 3n to be called is read from the storage area (M2) (step 112). It is determined whether there is a vacant dedicated line and transmission is possible (step 113).
In (Step 113), when there is a vacant dedicated line and it is possible to make a call, outgoing connection using the gateway device 4a is performed (Step 114), and connection to the telephone apparatus 3n at the base n via the dedicated line network 6 is performed. I do. If the leased line transfer connection is restricted in (Step 111) and the leased line is not available in (Step 113) and cannot be sent, the telephone device 3a as the caller is stored from the storage area (M3). The corresponding public line transfer connection class is read (step 120), and it is determined whether the transfer connection using the public line network 7 is restricted (step 121).
In step 121, if the public line transfer connection is not a restriction class, the transfer connection number to the public line corresponding to the telephone device 3n of the called party is read from the storage area (M2) (step 122). It is determined whether there is a vacant public line and it is possible to make a call (step 123).
In (Step 123), when there is a vacant public line and a call can be made, outgoing connection is performed using the gateway device 5a (Step 124), and connection to the telephone apparatus 3n at the base n through the public line network 7 is performed. I do.
If the public line transfer connection is restricted in (Step 121) and if the public line is not available in (Step 123) and a call cannot be made, a call restriction sound is connected to the telephone device 3a as the caller. .
In the above description, the case where the base is configured with two bases of the base a and the base n has been described as an example. However, the present invention is not limited to such a configuration, and there are three or more bases. May be.
<< Second Embodiment >>
Next, a second embodiment of the present invention will be described.
In a configuration in which a voice connection backup device that operates when a voice connection device fails or a VoIP network failure is installed at each site on the VoIP network, thereby enabling backup control of the telephone device and gateway device at each site, By performing the service of the invention on condition that communication between bases is not possible, connection between bases via a dedicated line network and a public line network can be made possible.

各拠点に設置の電話機装置およびゲートウェア装置は、音声接続装置からの制御信号を受けれなくなった条件にて、自拠点設置のバックアップ装置の制御を受ける構成において、拠点間の呼出しが行われた場合には、音声トラヒック／使用帯域が限界値を越えた条件と同判断がなされ、専用回線網または公衆回線網を介した迂回接続が行われる。   When a telephone device and a gateway device installed at each site are called between sites in a configuration that receives control of the backup device installed at its own site under the condition that it cannot receive the control signal from the voice connection device Is determined in the same manner as the condition that the voice traffic / bandwidth used exceeds the limit value, and a detour connection is made through a dedicated line network or a public line network.

本発明のＶｏＩＰネットワーク上に電話機装置およびゲートウェイ装置で構成される各拠点を示したブロック図である。It is the block diagram which showed each base comprised by the telephone apparatus and gateway apparatus on the VoIP network of this invention. 第１図の音声接続装置の記憶部内、記憶領域を示した図である。It is the figure which showed the storage area in the memory | storage part of the audio | voice connection apparatus of FIG. 第１図のブロック図で動作する拠点間迂回サービスの動作を示すフローチャートである。It is a flowchart which shows operation | movement of the detour service between bases which operate | moves with the block diagram of FIG.

符号の説明Explanation of symbols

１ ＶｏＩＰネットワーク
２ 音声接続装置
３ａ，３ｎ 電話機装置
４ａ，４ｎ ゲートウェイ装置
５ａ，５ｎ ゲートウェイ装置
６ 専用回線網
７ 公衆回線網 DESCRIPTION OF SYMBOLS 1 VoIP network 2 Voice connection apparatus 3a, 3n Telephone apparatus 4a, 4n Gateway apparatus 5a, 5n Gateway apparatus 6 Dedicated line network 7 Public line network

Claims (1)

ＶｏＩＰネットワークと、電話機装置と専用回線網接続用ゲートウェイ装置と公衆回線網接続用ゲートウェイ装置とを備えた複数の拠点と、前記複数の拠点間の音声接続制御を行う音声接続装置とを備え、
前記複数の拠点と前記音声接続装置とは前記ＶｏＩＰネットワークに接続され、
前記音声接続装置は、
前記複数の拠点間で前記ＶｏＩＰネットワークを介して音声通話接続が行われたとき、前記複数の拠点間の音声トラヒック／使用帯域を監視する手段と、
前記音声トラヒック／使用帯域が予め設定された限界値を超えたとき、前記専用回線網接続用ゲートウェイ装置または前記公衆回線網接続用ゲートウェイ装置によって専用回線網または公衆回線網を介した音声通話接続に切替える手段とを備えていることを特徴とする拠点間迂回接続方式。 A plurality of bases including a VoIP network, a telephone device, a dedicated line network connection gateway device, and a public line network connection gateway device, and a voice connection device that performs voice connection control between the plurality of bases,
The plurality of bases and the voice connection device are connected to the VoIP network,
The voice connection device
Means for monitoring voice traffic / bandwidth used between the plurality of bases when a voice call connection is made between the plurality of bases via the VoIP network;
When the voice traffic / bandwidth used exceeds a predetermined limit value, the voice communication connection via the private line network or the public line network is performed by the dedicated line network connection gateway device or the public line network connection gateway device. A detour connection method between bases characterized by comprising a means for switching.
JP2006275085A 2006-10-06 2006-10-06 Inter-base bypass connection system Pending JP2008098738A (en)

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JP2012175531A (en) * 2011-02-23 2012-09-10 Nec Engineering Ltd Telephone call switching system and method thereof, and telephone call switching device and program thereof

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JP2010141449A (en) * 2008-12-10 2010-06-24 Nec Corp Voip gateway apparatus, data communication system and voip connection control method used for the same
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