Patent ID: 9548999
Date: 2017-01-17
CPC Classifications: G06F,H04L

Claim:
1. A method for obscuring use of a Lawfully Authorized Electronic Surveillance (LAES) header included within Session Initiation Protocol (SIP) messaging used to support a session associated with packet-based voice and/or real-time multimedia applications, the method comprising: determining a validity function to be used in processing a field included in the LAES header for the purpose of assessing whether the session is to be placed under surveillance, the validity function generating a first result if the session is to be placed under surveillance and a second result if the session is not to be placed under surveillance; determining a randomly generated first value to be included in the field being processed with the validity function to facilitate obfuscating whether the session is to be placed under surveillance; determining the field to be a billing-correlation-ID (BCID) field of the LAES header having the first value; randomly generating the first value for the BCID field using a random number generator; assessing a first random number generated using the random number generator with the validity function, the first random number resulting in the validity function generating the first result; assessing a second random number generated using the random number generator with the validity function, the second random number resulting in the validity function generating the second result; and selecting the first random number as the first value for the BCID field if surveillance is desired and selecting the second random number as the first value for the BCID field if surveillance is not desired.