SIP over client initiated connections

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Helsinki University of Technology | Diplomityö
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Date
2007
Major/Subject
Tietokoneverkot
Mcode
T-110
Degree programme
Language
en
Pages
x + 44 s. + liitt. 3 s.
Series
Abstract
SIP outbound as an extension of SIP enables the client initiated connections in SIP signaling system. This feature is desirable in the case of NAT or firewall present between the public and the private side. In such situation, connections are only allowed from the private side to the public side. SIP outbound proposes a mechanism which keeps the client initiated connections between a UA and proxies and later reuses the same connections to push data to the UA from the proxy sides. This mechanism ensures the successful traversal of NAT/firewall. In this thesis we implemented SIP outbound protocol as an extension of SIP and integrated to the WeSAHMI experimental infrastructure and then evaluated the performance of the system as a whole.
Description
Supervisor
Ylä-Jääski, Antti
Thesis advisor
Tarkoma, Sasu
Keywords
SIP, SIP outbound, STUN keepalive, backoff mechanism, flow token, NAT
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