[26 May 2014] A bachelor student at RTSLAB was awarded the best thesis
award from IDA - Simon Andersson. more ...
[31 May 2012] A masters student at RTSLAB was awarded the best thesis
award from IDA - Ulf Magnusson. more ...
[27 February 2008] A masters student at RTSLAB was awarded the best thesis
award from IDA - Johan Sigholm. more ...
[03 March 2004] A masters student at RTSLAB was awarded the best thesis
award from IDA - Tobias Chyssler. more ...
[01 Jul 2003] For second year in a row a masters student at RTSLAB was awarded the best thesis
award from SNART - Mehdi Amirijoo. more ...
Master Thesis - Past Projects - Abstract
Load balancing of IP telephony
In today's world, more and more phone calls are made over IP. This results in an
increasing demand for scalable IP telephony equipment.
Ingate Systems AB produces firewalls specialized in handling IP telephony.
They have an inherent limit in the number of concurrent phone calls that they can
handle. This can be a bottleneck at high loads. There is a load balancing solution
available in the platform, but it has a number of drawbacks, such as media latency
and client capability requirements, limiting its usage.
Many companies provide load balancing solutions for SIP. However, it appears
few handle all the problematic scenarios that the Ingate firewall does. This master's
thesis aims to add load balancing functionality to the Ingate firewall, so that
it can handle all types of clients.
By splitting the firewall into two completely separate layers - a SIP layer and
a firewall layer - the concept of a virtual machine emerges. A machine is no longer
restricted to its physical SIP and firewall layers. Instead, virtual machines are
used to process calls. They still have SIP and firewall layers, but the layers can
reside on different physical machines.
This thesis demonstrates the operation of an innovative load balancing implementation.
The implementation was evaluated, and using four machines the test
setup performed 50% better than the original Ingate platform, while still retaining
all functionality - something that was not possible with the original platform.
This surpassed both the company's and my own expectations.
Author(s): David Montag
Contact: Simin Nadjm-Tehrani
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