Appendix: High Availability Configuration; Overview; Function Definition - Tadiran Telecom TGW4 SERIES User Configuration Manual

TGW4/8 Gateway Series for Aeonix
6

6.1 Overview

6.1.1 Function Definition

In the deployment of VoIP network, TGW4/8 Series Gateway supports high availability architecture
with Primary-Standby, Active-Standby and Load balancing modes.
Primary-Standby mode
In this mode, a backup SIP proxy server (referred to as SIP server) is configured. The gateway will
failover to the backup server automatically when the primary server fails. The gateway detects the
failure condition of the primary server by sending OPTIONS request to it.

If the gateway does not receive the response to OPTIONS request, it will failover to the backup server.

After failover to the backup server, the gateway will still send OPTIONS to the primary server all the same. It switches
back to the primary server once the response to the OPTIONS request is received.
For configuration procedure, see Configuring Primary-Standby Mode on page 117.
Active-Standby mode
In this mode, one SIP proxy server (referred as SIP server) functions as the primary server while other
SIP servers function as standby servers.
Either of the following conditions could trigger the failover operation of the gateway:

Not receiving response to the OPTIONS message from the current SIP server to which the gateway sends or receives
call traffic;

Not receiving response to the REGISTER/INVITE message from the current SIP server to which the gateway sends or
receives call traffic
The administrator can manually switchover the gateway from the current SIP server to the next
available one.
The gateway will redirect call traffic to the designated proxy server in response to the re-INVITE from
the server.
For configuration procedure, see Configuring Active-Standby Mode on page 119.
Load balancing mode (for Aeonix)
In this mode, the clustered SIP servers are all working in active status. Under the coarse grained scheme
all endpoints of a gateway are allowed to register on one of the designated servers and under the fine
grained scheme the endpoints of a gateway are allowed to register on multiple servers, according to the
Tadiran Telecom (TTL) L.P.

Appendix: High availability configuration

High Availability Configuration Guide
115