Science & Engineering Research Support soCiety (SERSC)
In the past 10 years, numerous users have applied Voice over Internet Protocol (VoIP) with the rise of VoIP-oriented businesses. The system filters incoming calls through an intrusion detection system engine. If a call is accepted, the middle box signature inspection initiates a Session Initiation Protocol (SIP) proxy for the incoming call. A bridge is then used to send the call to the SIP server through a double virtual private network. If the call is rejected by the anomaly detection box, however, the box sends a report to the network administration and efficiently audits rejected calls.