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The Session Initiation Protocol (SIP) has become the most predominantprotocol for Voice over Internet Protocol (VoIP) signaling. Security of SIP isan important consideration for VoIP communication as the traffic is transmittedover the insecure IP network. And the authentication process in SIP ranges frompre-shared secret based solutions to Public Key Infrastructure (PKI) basedsolution. However, due to the limitations in PKI based solutions, some PKI lessauthentications mechanisms are proposed. This paper aims to present an overviewof different authentication methods used in or together with SIP. We start byhighlighting the security issues in SIP in the context of VoIP communication.Then we illustrate the current activities regarding the SIP authenticationmechanisms including the recent developments in the research community andstandardization efforts within the Internet Engineering Task Force (IETF).Finally we analyze the security aspects of these approaches.

Towards Public Key Infrastructure less authentication in Session Initiation Protocol