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The connection between the hosts establishes using the three-way handshaking process. TCP is the connection-oriented protocol in the connection-oriented protocol, the two hosts should have established the connection before transmitting the data. SYN or TCP SYN flooding attack exploits the 3-way handshaking process. Flooding can be further divided into the following types: It occurs when the attacker consumes all the resources (bandwidth, TCP/IP connection, etc.) Flooding is the most common DOS attack because the tools to launch those attacks are available everywhere on the Internet. Flooding Attackįlooding attack is the part of a DOS attack, the objective is to make the network resources busy so that the legitimate user can’t connect and utilize the service offered to him/her. Ideally, there should be no packet loss for VoIP. The default G.729 codec requires packet loss far less than 1 percent to avoid audible errors. In the VoIP environment, resending the lost packet is not feasible because of the real-time communication. Packet LossĪ large number of packets travelling on the network and the network is not capable of handling the traffic it may cause some packets to get lost. VoIP applications use the jitter buffer technique to store some packets ahead the normal packets received. The common reason is no bandwidth management the allowable duration for jitter is 40ms. This delay may occur by route changes, queuing, time drifts and serialization. Jitter is when the sender sends packets constantly while the receiver gets the packets at variable rates. Jitter is the variation in packet delivery or delayed conversation. There could be several reasons for the delay such as the improper network configuration, the number of intermediate devices and physical distance.
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The maximum delay a VoIP network can tolerate is 150ms. Latency measures the time delay of packets crossing the network resources from the sender to the receiver. The time required for the voice to release from the speaker phone and reach the listener’s ears. Let’s discuss the factors of quality before attacking the environment: Latency Quality of service (QoS) is always on high priority, VoIP is famous for its quality, if users don’t get the quality then there is no reason to have a VoIP network. Introduce latency and jitter (compromise the quality of service).Compromise the network resources (network availability).