Hitachi Cable News Vol.358
Back Number  HITACHI Cablenews backnumber
Special Feature: Wireless IP Phones New-Generation Wireless IP Phones Redefine Office Communications

| Overview | Chapter 1-1: Use of IP networks in voice communications |
| Chapter 1-2: Full introduction of IP telephony using IP-PBX or IP Centrex |
| Chapter 1-3: Substantially reduces both call fees and operation/maintenance costs |
| Chapter 2-1: Provides a mobile phone's convenience with an IP phone's cost-effectiveness |
| Chapter 2-2: Achieves connectivity with multiple vendors' SIP servers |
| Chapter 3: Phased introduction of IP telephony infrastructure at low cost |
Chapter-3 Phased introduction of IP telephony infrastructure at low cost
step0 Legacy system
Corporate network linking the PSTN and PBX; data and voice networks exist separately.
step1 Use of existing PBX/External: IP (050)/Extension: analog
Install AquaVocal as a gateway to link existing PBX and phone services; The existing phone system can continue to be used without modifications.
step2 Partial introduction of IP telephony/Extension: analog + IP
Use the internal network to partially introduce IP phones. For partial introduction, add IP-PBX functionality to upgrade the PRI gateway. It becomes possible to consolidate data and voice networks.
step2 Full introduction of IP telephony/External: IP (050)/Extension: IP
Use the internal network to partially introduce IP phones. For partial introduction, add IP-PBX functionality to upgrade the PRI gateway. It becomes possible to consolidate data and voice networks.
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| Overview | Chapter 1-1: Use of IP networks in voice communications |
| Chapter 1-2: Full introduction of IP telephony using IP-PBX or IP Centrex |
| Chapter 1-3: Substantially reduces both call fees and operation/maintenance costs |
| Chapter 2-1: Provides a mobile phone's convenience with an IP phone's cost-effectiveness |
| Chapter 2-2: Achieves connectivity with multiple vendors' SIP servers |
| Chapter 3: Phased introduction of IP telephony infrastructure at low cost |

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