NEC SV8500, Manual

Page: 1260 / 3438

VOL.2-1007
MG(PRI) (1.5M) [SCA-24PRIA/MG-24PRIA]
14. MG(PRI) (1.5M) [SCA-24PRIA/MG-24PRIA]
14.1 General
14.1.1 What is MG(PRI) CARD/MG(PRI)?
MG(PRI) is a media gateway between ISDN network and IP network to provide an efficient network through
interaction with the Telephony Server. MG(PRI) is controlled by the Telephony Server, and a variety of services
can be performed.
The MG(PRI) has two types: “MG(PRI) Card [SCA-24PRIA]” for Card Type and “MG(PRI) Box [MG-
24PRIA]” for Box Type. The MG(PRI) Card [SCA-24PRIA] can also be accommodated in Multi Purpose Chas-
sis (MPC). Those ones are in the following:
The general structure of this equipment is shown in the diagram below.
MG(PRI) can operate in either of two modes, SIP mode or Proprietary Protocol mode. When MG(PRI) works
in SIP mode, the controlling signal between the Telephony Server and MG(PRI) adopts Session Initiation Pro-
tocol (SIP). Controlling signal and voice packets are encrypted to ensure security feature.
MG(PRI) (1.5M) Card [SCA-24PRIA]
B D
ALM PWR
ON
LINE LB
LINE Ether
100M LINK CONSOLE
RESET
MUSIC
MG(PRI) (1.5M) Box [MG-24PRIA]
B D
ALM PWR
ON
LINE LB
LINE Ether
100M LINK
CONSOLE
RESET
MUSIC
PH to control this operation
Signaling Control Data
Voice Data
Telephony Server
PSTN
(ISDN)
Internal PHI-PRI
SP-PHI MPH
Internal PHE
IP Terminal
MG(PRI)
Card/Box
Analog Telephone
Proprietary Protocol
mode
SIP
mode
Note 1
Note 2