NEC Univerge sv8500 Manual page 1186

13. MG-PRI/PRA
13.1 General
13.1.1 What is Media Gateway Primary Rate Access Interface?
Media Gateway Primary Rate Access Interface (MG-PRI/PRA) is an interface between IP network with ISDN
and provides an efficient network through interaction with the Telephony Server by using both networks. MG-
PRI/PRA is controlled by the Telephony Server, and a variety of services can be performed in conjunction with
the Telephony Server. The following is an example of the existing Telephone System and IP Telephone System
using MG-PRI/PRA and the Telephony Server. When a person calls New York from Tokyo using a typical tele-
phone network, a long distance call between Tokyo and New York is made and it costs high. However, using
telephone network via MG-PRI/PRA and the Telephony Server, a short distance call can be made through IP
network and ISDN, offering a cost-effective network.
Typical Telephone Network
Analog
Telephone
Telephone Network via MG
(analog terminal to analog terminal)
Analog
Telephone
Data are sent through PSTN
Data are sent through IP network
Media Gateway Primary Rate Access Interface (T1, E1)
T1 Type
Tx/Rx
ON
MUSIC
PWR LINE -LINE- LB
B D
MG-1.5M
Front
Network Configuration
Tokyo
PSTN
IP
Network
Telephony
Server
E1 Type
LINK
ON
PWR LINE -LINE-
B D
10/100
IMP
LINE
Front
New York
MG-PRI/PRA
VOL.2-933
Tx/Rx LINK
MUSIC
LB
TNS RCV 10/100
IMP
MG-2M
LINE
Analog
Telephone
PSTN
(ISDN)
Analog
Telephone
MG-PRI/PRA