VOIP security risks you should know about

Today, VoIP has emerged as a mainstream communications tool that many businesses are starting to integrate into their networks.But many companies are unaware of the security risk posed by unsecured Internet telephony voip.
VoIP is simply data transmitted in digital packet form. This means it can be attacked, hacked, intercepted, manipulated, re-routed and degraded just like packets on the data network. 
Many attacks focus on VoIP terminal. Operating system , Internet protocols, applications, and VoIP hard phones and soft phones running the management interface vulnerable to illegal access,  and a lot of denial of service (DoS) attacks. shutting down the second company's phone systems ,People can spoof a phone's IP address and make calls that are billed back to the company.These attacks are often used General Internet Protocol and VoIP protocol itself. 
 Now What are the risk factors when using VoIP ?
1-)VOIP Denial of Service (DOS) attack :
VoIP calls can be dropped untimely by also flooding the target with unnecessary SIP call-signaling messages, which results in halting of call processing.
2-)Vishing:Vishing or Voice Phishing
 is the latest example of the misuse of Voice over Internet Protocol-phones to steal personal financial information,
A vishing attack can be conducted by voice email, VoIP (voice over IP), or landline or cellular telephone.
The potential victim receives a message, often generated by speech synthesis, indicating that suspicious activity has taken place in a credit card account, bank account,or other financial service in their name. The victim is told to call a specific telephone number and provide information to "verify identity" or to "ensure that fraud does not occur" ,
When all the personal financial information is received from the victim this information is then digitally transcribed to the scammer’s computer.
3-)Toll Fraud(Service Theft) : occurs when a hacker gains access to a VoIP network and allows unauthorized users to make  long-distance calls, especially to international toll numbers.
4-) Eavesdropping:is when unauthorized parties monitor VoIP packets. By eavesdropping, they can listen in on conversations. They can also learn user names, passwords or other financial information.

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