Due to the recent global popularity gained by VoIP network while many organisations/industries are employing it for their voice communication needs, optimal security assurance has to be provided to guarantee security of their data/information against present day teeming security threats and attacks prevalent in IP-based networks. This research paper has critically investigated and analysed most of the security challenges associated with VoIP systems and traditional IP data networks; and has proposed several defence measures which if designed and implemented will prevent most (if not all) of the security threats plaguing these networks. Keywords: Network security, VoIP, Computer attack, Security threats, SIP, H.323, Defence measures, IPSec.
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