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NAT traversal for SIP-based presence services with symmetric dialog routing

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2 Author(s)

SIP (session initiation protocol) uses UDP and TCP as a transport protocol as well as SCTP, TLS. In the case of using UDP as a transport protocol, it is required to guarantee symmetric response routing for NAT or FW traversal. By the way, in the case of RFC3265-based presence services using SIP, there is some situation that requires symmetric dialog request/response routing for NAT. In this paper, we describe the way of guaranteeing symmetric SIP message routing within same IP-dialog.

Published in:

Advanced Communication Technology, 2009. ICACT 2009. 11th International Conference on  (Volume:02 )

Date of Conference:

15-18 Feb. 2009

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