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Lightweight Security Mechanism for PSTN-IP Telephony Convergence


Wojciech Mazurczyk, Zbigniew Kotulski


Vol. 7  No. 5  pp. 35-41


A new, lightweight security mechanism for the PSTN-VoIP hybrid networks is described. It is based on the two information-hiding techniques: audio watermarking and network steganography. The proposed scheme is suitable especially for the PSTN-IP-PSTN (toll-by-passing) scenario, which nowadays is a very popular application of the IP Telephony systems. Proposed mechanism can be used to authenticate end-to-end transmitted voice between PSTN users. Additionally it improves IP part traffic security (both media stream and VoIP signalling messages). Exemplary scenario is presented for SIP signalling protocol along with SIP-T extensions and H.248/Megaco protocol.


VoIP security, PSTN-IP Telephony interconnections, network steganography, audio watermarking