Last decade, a lot of research has been done in wireless communication technologies. Mobile
nodes such personal digital assistants (PDAs), notebooks and cell phones are nowadays used
in human’s daily life.
MANETs are networks consisting of two or more mobile nodes equipped with wireless
communication and networking capabilities, but they don’t have any network centrilized
infrastructure.
In last few years, MANETs have been emerged to be an important researched subject in the
field of wireless networking.
MANETs are autonomous; however they can communicate with other external networks such
the internet. They are linked to such external networks by mobile nodes acting as gateways.
This kind of networks is known as hybrid MANETs.
Voice over Internet Protocol (VoIP), is a technology that allows you to make voice calls using
a Internet connection instead of a regular (or analog) phone line.
The goal of this thesis is evaluate the performance of VoIP strategies for hybrid MANETs.
Two different aspects are evaluated, the session establishment performance and the voice
quality.
Network Simulator 2 is used to run several simulations, two different applications are used to
run voice simulations (Session Initiation Protocol and Exponential traffic generator). We
evaluate two different cases for voice traffics, voice calls between two MANET nodes and
voice calls between MANET nodes and external nodes.
After running the simulations, there are some performance parameters which will reveal the
results. The key findings of the simulations are: adding gateways, number of voice traffic
flows and the number of hops between source and destinations. There are some interesting
results which reveal for example, that adding gateways is not always beneficial.