Detection of SIP De-Registration and Call-Disruption Attacks Using a Retransmission Mechanism and a Countermeasure Scheme

SIP is an application-level signaling protocol that manages a mutual multimedia communication session. Presently, SIP is widely used with Internet messaging, games and with VoIP (voice over IP) due to advantages such as its simplicity, flexibility and variety of protocols. However, SIP is associated with many types of security issues and requires a countermeasure device against call-disturbance attacks that can cause a great amount of inconvenience to users. Therefore, this study analyses SIP De- registration and call-disruption attacks and proposes a means of detecting these attacks. Attack detection is accomplished through a comparison of the messages last sent by the user and those that are considered to be an attack based on a Retransmission mechanism. When a message is detected as an attack, the user is informed and a re-authentication process is performed.