Client Network Address Translator Traversal in Session Initiation Protocol

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Helsinki University of Technology | Diplomityö
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Date
2006
Major/Subject
Tietokoneverkot
Mcode
T-110
Degree programme
Language
en
Pages
90
Series
Abstract
Session Initiation Protocol (SIP) is an application layer signalling protocol developed by Internet Engineering Task Force (IETF) to establish, modify, and terminate multimedia sessions. SIP provides an open and generic architecture for rich media services over IP; such as voice, video, instant messaging, presence, white boarding, file transfer and gaming. However it can be further deployed for several emerging applications. Application layer signalling protocols such as SIP, H.323, and RTSP usually do not work in presence of Network Address Translators (NATs), which are deployed widely. These protocols insert the network and transport layer information into application payload. Since NAT works at network layer, this information becomes invalid outside NAT's domain. For successful adoption of the services based on these protocols, a seamless NAT traversal solution is needed within the current Internet infrastructure. This work aims to evaluate different NAT traversal and controlling mechanisms. Furthermore, based on this evaluation, an implementation of Interactive Connectivity Establishment (ICE) framework is carried out. ICE combines several NAT traversal mechanisms, which enable end-to-end connectivity of SIP peers. Recommendation for improvement of ICE framework is also presented that enables SIP peers to converge quickly, reduce media latency and optimize media setup signalling.
Description
Supervisor
Ylä-Jääski, Antti
Thesis advisor
Vehmanen, Kai
Keywords
SIP, NAT, ICE
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