Sintel

TelcoBridges Tmedia TMG800

TelcoBridges

The TelcoBridges Tmedia TMG800 is a carrier-grade VoIP media gateway providing T1/E1 interfaces, SIP/SS7/SIGTRAN signaling, and 1+1 redundancy for service provider voice infrastructure.

TelcoBridges Tmedia TMG800 Media Gateway

Introduction

The TelcoBridges Tmedia TMG800 is a low-density, carrier-grade VoIP media gateway designed for service providers requiring cost-effective, high-performance voice processing. This documentation outlines the technical specifications, signaling capabilities, media processing features, and operational management of the TMG800.

Audience: Network engineers, system integrators, and service providers deploying voice infrastructure.

Scope: This document covers hardware interfaces, voice/media processing, signaling protocols, redundancy configurations, and management interfaces.

Product Overview and Form Factor

The TMG800 is a 1U, 19” rackmount unit designed for flexibility and scalability. It supports software-upgradable T1/E1 interfaces, allowing capacity expansion from 1 to 16 T1/E1 lines in single increments.

  • Form Factor: 1U, 19” rackmount
  • VoIP Channels: 32 to 512 (universal codecs)
  • T1/E1 Ports: 1 to 16 (software upgradeable)
  • Power: Dual feed redundant power supplies (AC or DC)

The gateway supports the Tmedia 1+1 solution, extending high-availability features through active/standby redundancy for both TDM and IP traffic.

Rear view of the Tmedia TMG800 Media Gateway

Hardware Specifications

Physical Interfaces

The TMG800 provides diverse connectivity options for PSTN, VoIP, and management traffic.

Interface Type Specifications
PSTN (T1/E1) 1 to 16 ports; configurable per port for T1 or E1; RJ48C connectors; port status LEDs.
VoIP (Ethernet) Up to 6 ports (100/1000Base-T); RJ45 connectors; up to 16 different IP addresses.
Ethernet Features Port bonding, 802.1q VLAN support.
Management 2 Ethernet ports (100/1000Base-T); 1 USB Type B serial port.

Dimensions and Weight

Component Dimensions (H x W x D) Weight
TMG800 Gateway 1.75” (44.5 mm) x 16.9” (429 mm) x 16” (406 mm) 14 lbs (6.4 kg)
1+1 Patch Panel (8 T1/E1) 1.75” (44.5 mm) x 16.9” (429 mm) x 5.25” (133 mm) 3.4 lbs (1.6 kg)

Electrical Characteristics

  • Input Voltage: 90 to 260 VAC (47 to 63 Hz) or -32 to -72 VDC.
  • Power Consumption: Maximum 70W.
  • Redundancy: Dual feed redundant power supplies (AC or DC).

Voice and Media Processing

The TMG800 supports comprehensive voice processing features, including universal and proprietary codecs, fax/modem/data handling, and echo cancellation.

Vocoding

  • Universal Codecs: G.711, G.723.1, G.726, G.729ab, T.38 V.17, Clear Mode (RFC 4040).
  • Additional Codecs: G.722, G.722.2 (AMR-WB), G.728, G.729eg, iLBC, AMR, EVRC, GSM FR/EFR, QCELP, T.38 V.34.

Fax, Modem, and Data

  • Fax Relay: T.38 (V.17 and V.34).
  • Fallback: Automatic G.711 fallback.
  • Data: Modem and data pass-through; NSE and VBD support.
  • Clear Mode: RFC 4040 support.

DTMF and Echo Cancellation

  • DTMF Relay: RFC 2833/4733, SIP INFO method, in-band.
  • Echo Cancellation: G.168 standard; 128 ms echo tail on all channels simultaneously.

Voice Processing

  • Jitter Buffer: Adaptive and programmable (20 to 200 ms).
  • Voice Activity Detection (VAD): Supported.
  • Comfort Noise Generation (CNG): Supported.
  • Recording/Playback: Optional voice recording and announcement playback (up to 512 channels).

Signaling Protocols

The TMG800 simultaneously supports any combination of the following signaling protocols:

SIP (Session Initiation Protocol)

  • Supported RFCs: 2327, 2833, 2976, 3204, 3261, 3262, 3263, 3264, 3311, 3323, 3325, 3326, 3372, 3389, 3398, 3515, 3551, 3555, 3578, 3581, 3665, 3666, 3764, 3891, 4028, 4694, 4733, 5806.
  • Features: SIP-I/SIP-T support, extensive SIP header manipulation.

SS7 (Signaling System No. 7)

  • MTP2 Links: Up to 64 links (56, 64, or n x 56/64 kbps) or 2 x HSL.
  • Redundancy: Multiple redundant MTP2 links.
  • Point Codes: Up to 64 originating point codes and 256 linksets; up to 256 destination point codes.
  • ISUP Variants: ITU 92, ITU 97, ANSI 88, ANSI 92, ANSI 95, Q.767, Telcordia 97, ETSIv2, ETSIv3, China, Singapore, UK, SPIROU, Japan NTT, Russia.

SIGTRAN

  • Protocols: M2PA, M2UA, M3UA (IPSP, ASP, SG), IUA.
  • Transport: SCTP (raw IP and UDP).
  • Capacity: Up to 64 M2UA/M2PA links; up to 64 M3UA peer server processes.
  • SS7 Handling: Termination and/or relay supported.

ISDN PRI and CAS

  • ISDN PRI: Q.931 ISDN PRI (user and network side).
    • Variants: NI-2, 4ESS, 5ESS, DMS-100, DMS-250, Euro, ETSI NET5 (France, Germany, UK, China, Hong Kong, Korea), Euro Numeris (VN6), NTT (Japan), Australia, NFAS.
  • CAS: MFC R1 (including E&M, loop start, ground start) and MFC R2 (including standard ITU, Brazil, Mexico, Venezuela). Customizable script files available for any CAS variant.

GR-303 and H.248

  • GR-303: Call Control support.
  • H.248 (MEGACO): ITU-T versions 1 and 2; UDP transport; DTMF and fax detection; call progress, DTMF, and COT tone generation; call quality and inactivity alerts; control port redundancy (supports virtual IP); conferencing; CLIP (H.248.23); redundancy with no loss of calls.

High Availability and Redundancy

The TMG800 ensures carrier-grade reliability through hardware and software redundancy features.

Standard Redundancy

  • Power: Dual feed redundant power supplies.
  • IP Ports: Redundancy supported.
  • Software: Self-recovery software.
  • MTP2/SS7: Links redundancy.

Tmedia 1+1 Solution

The optional Tmedia 1+1 solution provides active/standby VoIP gateway redundancy with full capacity protection for both TDM and IP traffic.

Components:

  1. 1 Active Tmedia unit.
  2. 1 Standby Tmedia unit.
  3. 1 or 2 Tmedia 1+1 Patch Panel(s) (passive, no power required).

Features:

  • Configuration database redundancy.
  • Seamless software upgrade.
  • Fault-tolerant software.
  • M3UA/MTP3/ISUP redundancy.

Diagram of Tmedia 1+1 Patch Panel and Two Tmedia Units

Management, Analytics, and Security

OAMP+T Interface

The TMG800 includes a web-based Operation, Administration, Maintenance, and Provisioning (OAMP) interface with Transport management.

  • Configuration: GUI and CLI interfaces; configuration change audit logging.
  • Access Control: User and privilege management.
  • Monitoring: SNMP V2/V3 GET, TRAPs (alarms), extensive SNMP call statistics MIBs.
  • System Management: GUI-based and CLI system upgrade; configuration copy, backup, and restore; storage for multiple software versions and configuration files.
  • Provisioning: Non-service affecting configuration changes; offline configuration validation; multiple configuration files archive; machine-to-machine configuration interface.

Network Analytics (TB Analytics)

  • Live Call Trace: Protocol information and ladder diagram.
  • Live Test Call: Media playback and recording.
  • TB Sigtrace: Protocol signaling capture into pcap files.
  • Media Call Recording: Scriptable for calling and called numbers.

Session Management and Billing

  • SIP Peer Availability: Polling.
  • RTP Monitoring: Inactivity monitoring, RTCP.
  • CDR Generation: RADIUS and/or CSV files.
  • Lawful Intercept: Integrated (ETSI ES 201 671 v2.1.1).

Other Features

  • HTTPS Requests: For external applications (call routing, fraud protection, robocall mitigation).
  • MOS Scores: Calculated for every VoIP call.

Regulatory and Environmental Compliance

Regulatory Standards

  • Safety: CAN.CSA C22.2; EN 60950-1:2005; EN 60950-1:2006.
  • EMC: FCC Part 15:2013, Subpart B; CE Mark (EN55022:2010, Class A, EN61000, ETSI EN 300 386).
  • Other: RoHS compliant; NEBS level 3 compliant.

Environmental Specifications

  • Operating Temperature: 0 to +70 °C.
  • Storage Temperature: -10 to +85 °C.
  • Humidity: 95% relative humidity, non-condensing (operating and storage).