NAT traversing solutions for SIP applications

Authors:
Whai-En Chen;Ya-Lin Huang;Han-Chieh Chao
Affiliations:
Institute of Computer Science and Information Engineering, National I-Lan University, I-Lan, Taiwan;Department of Computer Science, National Chiao Tung University, Hsinchu, Taiwan;Institute of Computer Science and Information Engineering, National I-Lan University, I-Lan, Taiwan
Venue:
EURASIP Journal on Wireless Communications and Networking - Intelligent Systems for Future Generation Wireless Networks
Year:
2008

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Abstract

Session Initiation Protocol (SIP) has been proposed for multimedia services and wide-area connectivity in smart home environments (SHEs). An important issue for SIP deployment in SHEs is network address translator (NAT) traversing. SIP and Real-time Transport Protocol (RTP) packets are delivered between an SHE (i.e., private IP network) and Internet (i.e., a public IP network) through an NAT function of a home gateway, and the NAT translates the IP/transport layer address and port number but leaves the application layer content unchanged. This results in inconsistency between the IP addresses/port numbers in the IP/transport layers and those in the SIP layer. To resolve this issue, we describe six solutions including static route, UPnP, STUN, ICE, ALG, and SBC. Then we compare these solutions in terms of smart home appliance (SHA) modification, scope of NATs supported, multilayer NAT traversal, ease of configuration, security issue, and time complexities.