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[6]Miladinovic, I.;Stadler,J. Multiparty Conference Signalling using The Session Initiation
Protocol(SIP). Disponivel em: http://www.ibk.tuwien.ac.at/ftw-a1/02_04_24_PAPER_INC_2002.pdf
[7]Singh,Aameek;Acharya,Arup.Using Session Initiation Protocol to build Context Aware VoIP
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[8]Dalgica,Ismail;Fangb,Hanlin.Comparison of H.323 and SIP for IP Telephony Signaling. Disponivel
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Sites relacionados:
http://www.sipcenter.com/
http://www.onsip.org/
http://sip.org
http://www.sipquest.com
http://www.cs.columbia.edu/sip/
http://www.ietf.org/html.charters/sip-charter.html