SinoV-X500 GOIP gateway User Manual
www.sinovoip.com.cn
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1 Introduction
1.1 Overview
A VoIP GSM Gateway (GoIP Gateway) is a device which reduces costs when
calling from a fixed telephone line to mobile network. It enables direct routing
between IP, digital, analog and mobile networks.
GoIP Gateway is now used more and more for telephone carriers to land their IP
calls to mobile network. In those areas where fixed line services are unavailable
or much more expensive than the mobile cost, GoIP Gateway is an irreplaceable
alternative.
The following figure shows a basic topology of GoIP Gateway usage.
Figure 1.1
1.2 Glossary
VoIP:
Voice over Internet Protocol.
SIP:
Session Initial Protocol.
DTMF: Dual Tone Multiple Frequency.
IMEI:
International Mobile Equipment Identity.
LCR:
Least Cost Routing.
USSD: Unstructured Supplementary Service Data.
GSM: Global System Communications.
CDMA: Code Division Multiple Access.
WCDMA: Wideband Code Division Multiple Access.