Title :
Providing End-to-End Connectivity to SIP User Agents Behind NATs
Author :
Baldi, Mario ; De Marco, Luca ; Risso, Fulvio ; Torrero, Livio
Author_Institution :
Dipt. di Autom. e Inf., Politec. di Torino, Turin
Abstract :
The widespread diffusion of private networks in SOHO scenarios is fostering an increased deployment of network address translators (NATs). The presence of NATs seriously limits end-to-end connectivity and prevents protocols like the session initiation protocol (SIP) from working properly. This document shows how the address list extension (ALEX), which was originally developed to provide dual-stack and multi-homing support to SIP, can be used, with minor modifications, to ensure end-to-end connectivity for both media and signaling flows, without relying on intermediate relay nodes whenever it is possible.
Keywords :
IP networks; protocols; telecommunication signalling; IP network; SIP user agent; SOHO scenario; address list extension; end-to-end connectivity; media flow; network address translator; private network; session initiation protocol; signaling flow; Communication system control; Communications Society; Internet; Network address translation; Network servers; Payloads; Peer to peer computing; Protocols; Relays; Terminology;
Conference_Titel :
Communications, 2008. ICC '08. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2075-9
Electronic_ISBN :
978-1-4244-2075-9
DOI :
10.1109/ICC.2008.1103
