Compaq W25 manual Introduction, Background

1 Introduction

This document gives a brief description of the Fax over IP and the implementation in the Ericsson W25. It also includes a guidance of how to configure the Ericsson W25.

1.1 Background

The Ericsson W25 is intended for residential and SOHO applications. The focus for the Ericsson W25 is to enable both broadband data and voice calls using existing 3G network. Additionally support for analog Fax operation is essential when targeting business users such as SOHO users.

Fax support in GSM mobile networks is standardized, but not in 3G mobile networks. The available options in 3G mobile networks are T.37, store and forward mailbox, or T.38 Fax over IP. Since Fax communication is considered legally binding when doing business, the demand on Fax operation is that the sender of a Fax can get a receipt that the fax has been delivered to the recipient in real-time. Therefore, Ericsson has chosen Fax over IP (T.38) using packet switched connection in the Ericsson W25 to enable Fax operation in 3G mobile networks. This, since it is the only option that can guarantee that a fax has been delivered to the recipient in real- time. This can be done thanks to HS(D)PA introduced in 3G mobile networks with features such as increased data bandwidth and reduced delay.

2/221 02-FGB 101 327 Uen B – November 2007 3