ELTEX SMG-4 - 1 Device Description; Purpose

8 SMG digital gateway
1 DEVICE DESCRIPTION
1.1 Purpose
The SMG trunk gateway is designed to interface signalling, PSTN (E1) media streams, and VoIP networks.
SMG is an optimal and robust solution that can be used to upgrade, develop, and migrate
telecommunication infrastructures from PSTN to NGN.
SMG Main Specifications
 Number of E1 interfaces:
– for SMG-2: 1 or 2
1
;
– for SMG-4: 4.
 Number of VoIP channels:
– for SMG-2: 104;
– for SMG-4: 128.
 Maximum load intensity—40 cps.
 Number of Ethernet ports:
– 1 port 10/100/1000BASE-T.
 Static address and DHCP support.
 IP telephony protocols: SIP, SIP-T, SIP-I.
 TDM protocols: ISDN PRI(Q.931), QSIG, and CORNET for subscriber name transmission, SS-7
(quasi-associated mode operation).
 DTMF transmission (SIP INFO, RFC2833, in-band).
 Echo cancellation (G.168 recommendation).
 Voice activity detector (VAD).
 Comfortable noise generator (CNG).
 Adaptive or fixed jitter buffer.
 V.152 data transmission.
 Fax transmission:
– G.711 pass through;
– T.38 UDP Real-Time Fax.
 NTP support.
 DNS support.
 SNMP support.
 ToS for RTP and signalling.
 Firmware update: via web interface, CLI (Telnet, SSH, console (RS-232));
 automatic update of firmware and device configuration.
 Configuration and setup (also remotely):
– web interface;
– CLI (Telnet, SSH, console (RS-232)).
1
Only one E1 stream is available in an SMG-2 device by default. To activate another one, a special licence is required. For
more information about licences, see section 4.1.19. Licence Renewal