NEC Univerge sv8500 Manual page 1505

16.1.2 Function Overview
One of the main purposes of MG-T1(SIP) in the system is to establish peer-to-peer connection between IP net-
work and PSTN line, emulating the digital circuit on T1 interface to the connected line's signaling. *Refer to
Section 16.1.5 Service Conditions
The general structure of MG-T1(SIP) is shown in the diagram below.
T1 (Digital Trunk Interface) 1.5M: 64Kbps
SP-PHI, which is accommodated in MPH (Multi Protocol Handler) of the Telephony Server, handles the
Note 1:
control signal from/to MG-T1(SIP). MPH is the interface for the control signal. Call control between SP-
PHI and MG-T1(SIP) is executed via TCP/IP port of the system.
TFTP server is required for file downloading. For details, refer to
Note 2:
nance.
for the signaling format supported by MG-T1(SIP).
Internal PHE
MPH SP-PHI
Note 1
TFTP server IP Terminal
Note 2
PH to control this operation
VOL.2-1252
Telephony Server
Signaling Control Data
Voice Data
MG-T1(SIP)
PSTN
24ch
Analog Telephone
Section 16.4 Operation and Mainte-
MG-T1(SIP) [SCA-24DTIA]