Research by business wire has revealed that by 2020 there would be more than 350 million VoIP subscribers in the business world and the industry would generate more than $136 million in revenue.
It is no secret that most organizations are opting for VoIP phone systems for business purposes either as a standalone mode of communication or in conjunction with the traditional phone system. There are some companies that provide voice over internet protocol system for business.
Some of the common threats faced by VoIP systems are:
Call fraud: Hackers can break into the VoIP system and route long-distance calls including international calls and premium rate phone calls without the consent of the management. This results in a significant loss of money within a short period of time.
VoIP eavesdropping: While serving customers through VoIP networks, organizations obtain critical information like personal identities, account numbers, and other financial credentials. Losing such confidential information to hackers can result in loss of reputation and customers too.
Phishing: Spoofing of the "calling party identity" is common in the VoIP world and can be difficult to track unless the right measures are established.
Apart from these types of attacks, unprotected VoIP networks also suffer from DoS attacks, infiltration of data through media sessions, signaling malware, and Spam over Internet Telephony (SPIT).
The hacker may disrupt the IP network and may cause phone outages which leads to poor VoIP traffic and the quality of calls begin to deteriorate (even a 200 ms delay in the IP network will interfere with call quality).
The Address Translation Table in the VoIP is used to track phone numbers and IPs. This table can be subverted and improper connections can be established.