A single of the most security concern in UC is eavesdropping. This is the proven fact that external parties can infiltrate the IP interconnection to eavesdrop on a Web conference, receive instant message exchange or other communication medium. Consequently, the biggest concern is when organizations extend their UC capacities beyond boundaries that is to the exterior partners. Additionally, SIP trunking is another service that allows organizations to use voice over IP through the net connection. This has created a lot of concern when the business moves from a digital connection to an IP-based connection to be able to receive and make phone calls with regards to hacking raises. The best way to mitigate this concern is to make certain that the system includes SIP-aware firewalls or session line control as the safety mechanisms. In addition to this, there are many products in the DRINK security market that will help mitigate risks.One more growing concern is refusal of service this is an attack method frequently discovered with the Net though it has become a growing threat to UC. This has caused the proliferation of mobile devices in the workforce that has caused the hottest entrant into the UC infrastructure. With this, there is a valuable addition, allowing staff to be involved in meetings and collaborative activities from wherever they are, nonetheless they also present issues. For most organizations, it allows employees to use their own cellular phones, for occasion, there is worry about protection of password as well as how to wipe the data from the phone when it is lost, and exactly how to make certain call data records usually are compromised.For these devices, best practices include shutting down unused services and slots and changing default security passwords. For the network, suggestions include deploying firewalls, router access control lists, digital local-area networks, port-level change security and authenticated network access. Securely authenticate all mobile users of company assets. Implement remote security management. Implement end-to-end concept and data encryption. Mount remote device lock and remote device kill in the case of theft or loss.Various other proactive moves include employing host- and network-based attack detection and intrusion elimination systems or proxy web servers to protect SIP trunking. Although, security for UC has come a considerable ways in the past few years, it is getting better. The SIP security functions is not only much better, but there is a lot appealing around security certificate authentication mechanisms. With this in position, users inserting a call over an IP network would be able to validate the identity of the person on the other end (Bradley, & Shah, 2010).