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The SIP-Based System Used in Connection with a Firewall
Koski, P. Ylinen, J. Loula, P.
Tampere University of Technology, Pori;

This paper appears in: Telecommunications, 2006. AICT-ICIW '06. International Conference on Internet and Web Applications and Services/Advanced International Conference on
Publication Date: 19-25 Feb. 2006
On page(s): 203- 203
ISBN: 0-7695-2522-9
Digital Object Identifier: 10.1109/AICT-ICIW.2006.191
Current Version Published: 2006-04-03

Abstract
Different methods, such as ALG, STUN, TURN and FCP have been proposed for using SIP together with firewalls and NAT. The most suitable solution has to be determined in every situation. Some of these methods cause more network traffic and capacity requirements, while others require support from the clients being used in the network. In this paper a system which makes it possible to offer SIP service to customers behind NAT without making any changes to firewalls is presented. The system is based on an RTP proxy and a SIP server, which modifies SIP messages.

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