Redundancy & High Availability

This article describes TelcoBridges' VoIP Gateway high availability features. The hardware and software are design with the following 2 goals in mind:

1. First and foremost, to recover from a system failure to minimize the system down time or instability as much as possible. This is achieve with a fault tolerant and redundancy architecture.
2. Secondly, to keep active calls open after a fail-over whenever possible.

TelcoBridges High Availability

TelcoBridges High Availability should be seen as a collection of high availability and redundancy features instead of one single feature. This means that customer can go as little or as far as they want to create a high availability system.

Definitions

Here is a list of terms used in the description of the high availability features:

• Active Calls
• Active/Standby
• Load Sharing
• Master/Slave
• Primary/Secondary
• Resynchronization
• Switchover
• Switchover Period
• Transient Calls

High Availability Features

Hardware High Availability Features

• Dual Power supply
  
• Networking
  • Control Network Redundancy
  • Dual VoIP Network
  • TMS Network
• Host redundancy
  
  • Hard Disks
• Tdm Interfaces (OC3/STM-1 APS)
• Clocking (Multiple clock sources)

TelcoBridges Hardware HA Product Checklist

This checklist provides a quick overview of each Tmedia product and their high availability/redundancy hardware support

Products	Hardware High Availability Features
	TMG800	TMG3200 Series	TMG7800
Dual Power Supply	{{#switch: Y	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }} (Optional)	{{#switch: Y	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }}	{{#switch: Y	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }}
Control Network Redundancy	{{#switch:	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }}	{{#switch:	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }}	{{#switch: Y	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }}
Dual Voip Network	{{#switch: Y	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }}	{{#switch: Y	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }}	{{#switch: Y	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }}
Host Redundancy	{{#switch: N	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }}	{{#switch: N	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }}	{{#switch: Y	Y	YES	y	yes = Y	N	NO	n	no = N	N/A }}

Software Features

• CDR
• Configuration Database
• H.248
• Signaling Stack
  • CAS
  • ISDN
  • SIGTRAN
    • M2PA
    • M2UA
    • M3UA
  • SIP
  • SS7
    • ISUP
    • MTP2
    • MTP3
    • SCCP/TCAP
• TMG-CONTROL
• Provisioning

Installation, Maintenance and Provisioning

This section will show how to install, upgrade and configure a high availability system.

First, we will look at the software installation and provisioning (Host redundancy).

• Installing a host redundancy system

• Upgrading a host redundancy system

• Configuring a host redundancy system