Patent ID: 7394804

Claim:
A method for making an Internet Protocol (IP) call comprising the steps of: checking a Session Initiation Protocol (SIP) message for any request for an Anonymous Call; performing at least one of the operations of modification and erasure, on said at least part of the SIP message, if the request is detected; sending the SIP message processed as described above; modifying an original caller's address to a temporary address at the initiation of a conversation; discarding the temporary address at the end of the conversation; determining whether a random address is created or not; obtaining an Internet Protocol version 6 (IPv6) address prefix from a router in the same subnet if the random address is created; creating an interface ID; creating a temporary IP address from the IPv6 address prefix and the interface ID; creating a modified entry or a new registration entry of user information using the temporary IP address and a UserID to register the user's account; and canceling an account registration and discarding the IP address at the end of the conversation.