The research study could provide information on the issues of Voice-over-Internet Protocol technology particularly on the integrity, vulnerability and security of VoIP calls. Further, this study would also be a review on the VoIP Technology present and service providers based in the United States, particularly in local area.This study would be beneficial to the Commission on Telecommunication in the city as this study enhance the knowledge of the telephony providers and users about the possible issues on VoIP Technology. Furthermore, this study would be beneficial to the telephony providers and the users as this study would provide the necessary information on the different threats and attacks in VoIP technology. This would expectedly heighten the awareness of the providers and the users to equip a counterattack to possible threats. To the future researchers, this study can provide baseline information on the recent status of VoIP technology.