High Available VoIP Server Failover Mechanism in Wide Area Network
Abstract: The development of
telecommunication technology specified the Internet Protocol (IP) based
technology for the next generation network. Voice over Internet Protocol (VoIP)
has been introduced to overcome future telephony demand. However, these rapid
changes encountered some issues, and the most critical is how to provide the
services availability and reliability equally to circuit based telephony.
Virtualization is widely used not only for hardware efficiency and maintenance,
but also for High Availability support. Virtualized environment provides the
ability among servers to migrate or replicate into another machine, even when
they are running their services, which is known as Live Migration. In this
paper, the ability of virtualization failover mechanism over WAN and voice
quality of VoIP service when running on the High Availability system in
virtualized environment is studied and examined. The objective analysis by
using quality of services (QoS) attributes is conducted as well as the
subjective analysis using Mean Opinion Score (MOS). The work utilizes Xen®
Hypervisor with modified Remus extensions to provide the High Availability
environment with GRE tunnelling and newtwork virtualization. Remus approach
using checkpoint based is deployed to copy the primary server to the backup
server. A range of 40ms – 900ms has been applied as time interval of
checkpoint. The results show that the the failover downtime is 1.4 s and mean
jitter is 9,98 ms, packet loss 3,12% and MOS 3.61 for Remus 400ms checkpoint.
MOS with different checkpoint time interval is also presented.
Author: Hery Dian Septama,
Ardian Ulvan, Jiri Hlavacek, Robert Bestak
Journal Code: jptkomputergg150114
