Patent ID: 8040875
Filing Date: 2011-10-18
Classification: H04Q

Abstract:
1. In a communication system supporting a Voice over IP (VoIP) call, wherein a calling party node initiates the VoIP call by sending a Session Initiation Protocol SIP message to a network device the SIP message including an offered IP address associated with the calling party node, and wherein Caller ID information associated with the calling party node and based on the offered IP address is displayed to a called party node, a method of determining the validity of the Caller ID information, the method comprising the network device: detecting the offered IP address; comparing the offered IP address to an actual IP address associated with the calling party node to determine the validity of the offered IP address; and determining the validity of the Caller ID information based on the validity of the offered IP address, the Caller ID information being valid if the offered IP address is the same as the actual IP address and the Caller ID information being invalid if the offered IP address differs from the actual IP address.