JP3909302B2 - Method for transferring VoIP traffic in provider access network - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention transfers VoIP traffic in an access network to a backbone network of a provider such as ISP (Internet Service Provider) or ASP (Application Service Provider) that provides a VoIP (Voice over IP) service using a global IP address. It is about the method.
[0002]
[Prior art]
In the conventional technology, as shown in FIG. 1, there are two carriers ISP-A and ISP-B that provide VoIP service, and a carrier that provides an access network to the backbone network. When providing an access network to the ISP-A and 1SP-B backbone networks using the VPN technology and the logical closed network VPN-A or VPN-B during the VoIP communication, the connection destination is a general subscriber telephone. In order to provide a PSTN connection function for transferring a certain VoIP traffic to a PSTN (Public Switched Telephone Network), the PSTN connection function units GW-A and GW-B such as gateways installed individually for each provider are respectively connected. Connected to the access network.
[0003]
Accordingly, the VoIP packet from the IP telephone terminals of the users A1 to A4 of the provider 1SP-A is transmitted from the logical access network VPN-A of the ISP-A to the backbone network of the ISP-A when the transmission destination is the IP telephone terminal. When the destination is a general subscriber telephone, the public switched telephone network (PSTN) is sent from the logical access network VPN-A of the ISP-A through the PSTN connection function unit GW-A. Forwarded to When the destination is an IP telephone terminal, the VoIP packet from the IP telephone terminals of the users B1 to B3 of the provider 1SP-B is transmitted from the ISP-B logical access network VPN-B to the ISP-B backbone network. When the destination is a general subscriber telephone, the public switched telephone network (PSTN) is sent from the ISP-B logical access network VPN-B via the PSTN connection function unit GW-B. (See, for example, Non-Patent Document 1).
[0004]
Therefore, in the conventional method for realizing an access network for a provider, when providing a PSTN connection function for VoIP traffic, it is necessary to set a PSTN connection function unit for each provider individually.
Further, in order to construct a VoIP traffic dedicated network common to each provider, it is necessary to separate the VoIP traffic from the provider side and then connect it to the dedicated network.
[0005]
[Non-Patent Document 1]
"NTT Technical Journal 2001, No. 10," pages 52-53 [0006]
[Problems to be solved by the invention]
Therefore, in the conventional technology, it is necessary to install a VoIP traffic PSTN connection function unit in each provider in the access network for providers, resulting in an inefficient network configuration. In addition, a VoIP traffic dedicated network common to the providers cannot be efficiently realized.
[0007]
SUMMARY OF THE INVENTION Accordingly, a first object of the present invention is to provide a VoIP transfer method for providing a VoIP traffic PSTN connection function that can be shared by a plurality of providers when providing an access network for a provider and transferring VoIP traffic to the PSTN. It is in.
[0008]
A second object of the present invention is to provide a VoIP traffic transfer method that provides a dedicated transfer network for VoIP traffic that can be shared by a plurality of providers when providing an access network for a provider, and transfers VoIP traffic through the dedicated transfer network. It is in.
[0009]
[Means for Solving the Problems]
In order to achieve the first object, the invention of claim 1 provides an access network to a backbone network to a provider such as an ISP or ASP that provides a VoIP service using a global IP address. When a telecommunications carrier provides an access network to each provider using a logical closed network using VPN technology, a PSTN connection function unit is constructed as an extranet of a plurality of VPN access networks. Provided is a VoIP traffic transfer method in which providers share a common PSTN connection function unit and transfer VoIP traffic to the PSTN.
[0010]
According to this method, when providing an access network to a plurality of providers, the access network of each provider is constructed by the VPN technology, and the PSTN function unit is constructed as an extra network of the access networks of the plurality of providers. Therefore, a virtual shared VoIP transfer network in which a plurality of providers share one PSTN connection function unit is realized, and it is not necessary to install a plurality of providers individually, and network costs can be reduced.
[0011]
In order to achieve the second object, the invention of claim 2 provides that a telecommunications carrier that provides an access network to a backbone network for a provider that provides a VoIP service using a global IP address. When providing an access network to each provider using a logical closed network using VPN technology, if the VPN access network is also provided with a function for identifying VoIP traffic and a function for distributing to a specific logical path, a dedicated router for VoIP traffic is provided. By accommodating in the network as an extranet of a plurality of VPN access networks, a shared VoIP traffic dedicated network is virtually constructed in the plurality of VPN access networks, and a plurality of providers transfer the VoIP traffic through a common dedicated network. VoIP traffic transfer method characterized by That.
[0012]
According to this method, when providing an access network to a plurality of providers, the access network of each provider is constructed by the VPN technology, and only the VoIP traffic is distributed to the extranet within the access network, and the dedicated VoIP traffic is used. Since the router is constructed as an extranet of these access networks, a virtual VoIP traffic dedicated transfer network common to a plurality of providers is realized.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the invention of claim 1 is shown in FIG.
In this example, a carrier that provides an access network to the backbone networks BN-A and BN-B for two providers ISP-A and ISP-B that provide VoIP services. As shown in FIG. 1, when an access network to the backbone network of ISP-A and 1SP-B is constructed by using VPN technology with logical closed networks VPN-A and VPN-B, two providers On the other hand, in order to provide a PSTN connection function for VoIP traffic, as shown in FIG. 2, an extranet C having reachability on the IP from both the VPN access network A and the VPN access network B is constructed. By attaching the PSTN connection function unit GW to the extranet C, two ISP-A and ISP-B The PSTN connection function unit common to all providers is realized. Note that FIG. 2 shows the case of two providers, but the same can be realized when there are a larger number of providers.
[0014]
According to this embodiment, when providing an access network to a plurality of providers, the access network of each provider is constructed by VPN technology, and the PSTN function unit is constructed as an extranet of the access networks of the plurality of providers. Therefore, both the VoIP packet from the IP telephone terminals of the users A1 to A4 of the provider 1SP-A and the VoIP packet from the IP telephone terminals of the users B1 to B3 of the provider 1SP-B are used when the transmission destination is a general subscriber telephone. The PSTN connection function unit GW is reached via the respective logical access networks VPN-A or VPN-B and Extranet C, and is transferred to the PSTN by the common PSTN connection function unit GW.
[0015]
An embodiment of the invention of claim 2 is shown in FIG.
In this example, as shown in FIG. 1, a telecommunications carrier that provides an access network to a backbone network for two two providers ISP-A and ISP-B that provide a VoIP service, When an access network to the ISP-A and 1SP-B backbone networks is constructed by the logical closed networks VPN-A and VPN-B using the VPN technology, as shown in FIG. An extranet C with IP reachability is constructed from both the A and VPN access networks B, and a function for allocating only VoIP traffic to the extra C in each of the access networks A and B is dedicated to VoIP traffic. By assigning router R to extranet C, ISP-A and IS A virtual VoIP traffic dedicated network common to the two providers of P-B is realized. Although FIG. 3 shows the case of two providers, the same can be realized when there are a larger number of providers.
[0016]
According to this embodiment, when providing an access network to a plurality of providers, the access network of each provider is constructed by VPN technology, VoIP traffic is distributed to the extranet within the access network, and VoIP Since the traffic-dedicated router is constructed as an extranet of access networks of a plurality of providers, users of a plurality of providers can perform IP telephone communication via a common virtual VoIP dedicated network.
[0017]
【The invention's effect】
According to the present invention, the network cost can be reduced by sharing the VoIP connection function unit, which had to be installed individually by a plurality of providers, with a plurality of providers. Further, by constructing a VoIP traffic dedicated network common to a plurality of providers, it becomes possible to share additional service devices such as a teleconference device among the plurality of providers.
[Brief description of the drawings]
FIG. 1 is a diagram showing a method for transferring VoIP traffic in a conventional provider access network.
FIG. 2 is a diagram showing a first example of a VoIP traffic transfer method in an access network for a provider according to the present invention.
FIG. 3 is a diagram showing a second embodiment of the VoIP traffic transfer method in the access network for providers according to the present invention.
[Explanation of symbols]
ISP-A Internet Service Provider A
A1-A4 Provider A user BN-A Provider A backbone network VPN-A Provider A virtual access network ISP-B Internet service provider B
B1-B3 Provider B User BN-B Provider B Backbone Network VPN-B Provider B Virtual Access Network PSTN Public Switched Telephone Network VPN-C Virtual Extranet GW PSTN Connection Functional Unit R VoIP Dedicated IP Router

Claims (2)

A carrier providing an access network to a backbone network to ISPs and ASPs that provide a VoIP service using a global IP address can use a logical closed network using VPN technology. When providing an access network to each provider, a PSTN connection function unit is constructed as an extranet of a plurality of VPN access networks, so that a plurality of providers share a common PSTN connection function unit and transfer VoIP traffic to the PSTN. A method of transferring VoIP traffic, characterized by transferring. For a provider that provides a VoIP service using a global IP address, a telecommunications carrier that provides an access network to a backbone network accesses each provider using a logical closed network using VPN technology. When providing a network with an identification function for VoIP traffic and a function for allocating to a specific logical path in the VPN access network, a plurality of dedicated VoIP traffic routers are accommodated in the network as extra networks of a plurality of VPN access networks. A VoIP traffic transfer method characterized in that a shared VoIP traffic dedicated network is virtually constructed in the VPN access network, and a plurality of providers transfer VoIP traffic through the common dedicated network.

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