Dalhio, H., Mian, M. M., & Singh, J. (2010). VoIP Signal Processing in Digital Domain. IUP Journal of Electrical & Electronics Engineering, 3(4), 38-43. Retrieved from EBSCOhost.
Nunn, L., McGuire, B., & Crowe, B.. (2010). Voice-Over-Internet Protocol (VOIP) Cost Efficiencies And The Decision To Implement. The Review of Business Information Systems, 14(1), 1-11. Retrieved February 27, 2011, from ABI/INFORM Global. (Document ID: 1964679221).
Voice over internet protocol (voip) & 911. (n.d.). Retrieved February 27, 2011 from http://www.wpcde911.com/VoIP%20Background.htm
Voip - voice over ip. (n.d.). Retrieved February 27, 2011, from http://www.pcreview.co.uk/articles/Internet/VoIP_-_Voice_Over_IP/
Introduction to voip. (n.d.). Retrieved February 28, 2011 from http://www.packetizer.com/ipmc/papers/understanding_voip/voip_introduction.html
Swapnil Srivastava, Initials. (n.d.). Benefits of voip. Retrieved February 27, 2011 from http://www.buzzle.com/articles/benefits-of-voip.html
Legal issues. (n.d.). Retrieved February 27, 2011 from http://www.packetizer.com/ipmc/papers/understanding_voip/voip_introduction.html
Voip legal issues. (n.d.). Retrieved February 27, 2011 from http://www.voipproviderslists.com/voip-legal-issues/
Nadeem,Unuth,(s about VoIPn.d.) Security threats in voip. Retrieved February 27,2011 from http://voip.about.com/od/security/a/SecuThreats.htm
ROY, FURCHGOTT. (22 February 2011). Free and cheap calls without skype. Retrieved from http://gadgetwise.blogs.nytimes.com/2010/12/23/free-and-cheap-calls-without-skype/?scp=6&sq=VoIP%20technology&st=cse
Linder, Brad. (2011, February 25). skype to go lets you make cheap international calls, no app required . Retrieved from http://liliputing.com/2011/02/skype-to-go-lets-you-make-cheap-international-calls-from-any-phone.html
