October 17, 2003


Provision of Corporate IP Telephone Service


To meet the diversifying needs of corporate customers, NTT West Corporation (NTT West) will release the Corporate IP Telephone Service and today filed notice of the service contract terms and rates.


1. Service Description

The Corporate IP Telephone Service is a service for large-lot corporate customers. Using IP technology, the service provides corporate customers with a dedicated IP telephone network (Corporate IP Telephone Network) allowing them to make calls both within the network and to outside fixed-line and other destinations at low rates. Moreover, customers can receive incoming calls with the same telephone numbers that they have been using for their fixed-line and other telephones.

The IP Centrex Function will also be available as an optional service.

<Service Features>

(1) Voice quality comparable to fixed-line telephone service
Provision of a guaranteed-service dedicated IP telephone network, along with management of simultaneous connections in the network and of access line channels, assures voice quality on the same level as that of a fixed-line telephone network.

(2) Conventional 0AB-J telephone numbers
The service uses the same 0AB-J numbering scheme as the existing fixed-line telephone network. Moreover, current customers of NTT West fixed-line telephone services who migrate to this service in the same location are able to keep their existing telephone numbers (number portability).

(3) Economical dialing charges
Unlimited calls within the same subscriber group can be made at no cost beyond the basic monthly charge. Calls to fixed-line and other telephones in the same prefecture are only 6 yen per 3 minutes, and calls across prefectures are only 10 yen per 3 minutes. These rates represent a significant savings for voice communication.

(4) Use of existing PBX or IP-PBX system
By installing a gateway or similar equipment, customers can continue to use their existing PBX and IP-PBX systems without changing the functions or operations, for effective utilization of existing assets.

(5) Optional IP Centrex Function
The IP Centrex Function is available as an optional service. This provides standard PBX functions such as call handling and station transfer as part of the IP telephone network, enabling customers to eliminate the cost of installing, operating, and maintaining a PBX.

(6) Customer control functions
Customer control functions let customers configure their own pilot groups and change other feature settings in real time. These changes do not require special application to NTT West.

See Attachment 1 for an overview of the service.


2. Charges

See Attachment 2.


3. Service Requirements

- Customers must have 100 Mbps guaranteed-bandwidth Ethernet lines dedicated to accessing this service. The Urban Ether high-speed Ethernet service offered by NTT West may be used for this purpose.
- When using existing PBX or IP-PBX equipment, a gateway or other equipment may be required.


4. Service Area

Service will be available initially in Osaka City.


5. Scheduled Start

Wednesday, October 29, 2003



- [Attachment 1] Service Overview
- [Attachment 2] Charges


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