Title	A Closer Look on Challenges and Security Risks of Voice Over Internet Protocol Infrastructures
Author	Ahmed H. Al Omari, Yazan A. Alsariera, Hussam S. Alhadawi, Mahmoud A. Albawaleez, Sultan S. Alkhliwi
Citation	Vol. 22  No. 2  pp. 175-184
Keywords	VOIP Security, Attacks, SIP, Confidentiality, Integrity, availability.