Livres
• Olivier Hersent, David Gurle, Jean-Pierre Petit, La voix sur IP : Déploiement des architectures VoIP, IMS et TISPAN Protocoles SIP 3GPP et IETF, H.323, MGCP
• Alan B. Johnston, SIP Understanding the Session Initiation Protocol, second edition, ARtech House Publishers
• Vineet Kumar, Markku Korpi, Sentil Sengodan, IP Telephony with H.323, Architecture for Unified Networks and Integrated Services, Wiley
• Ken Camp, IP Telephony demystified, McGraw-Hill Networking
Sites web
• http://www.tech-invite.com
• http://www.packetizer.com/
• http://www.asteriskguru.com