A mechanism to recover voice from logged VoIP sessions based on RTP

Author

Choudhury, Paromita ; Kumar, K. R Prasanna ; Athithan, G. ; Nandi, Sukumar

Author_Institution

Center for Artificial Intell. & Robot., Bangalore, India

fYear

2011

fDate

12-13 Dec. 2011

Firstpage

1

Lastpage

5

Abstract

The convergence of voice and data on Internet Protocol (IP) networks has led to tremendous growth of Voice over IP (VoIP). While SIP/ H.323 are dominant signaling protocols, RTP is widely used for media transfer. Certain situations may require logging of RTP sessions along with the signaling information for call and voice analysis. Recovering voice from RTP packets requires explicit handling of RTP stack and decoding. In this paper, we propose a scheme that uses softphones with appropriate codec support for voice recovery from logged RTP packets. It is done using inherent provisions of RTP, specifically SSRC-multiplexing. The scheme also suggests the possibility of an active stream injection attack in RTP based VoIP.

Keywords

Internet telephony; security of data; signalling protocols; Internet protocol networks; RTP; SIP/ H.323; SSRC-multiplexing; Voice over IP; active stream injection attack; dominant signaling protocols; logged VoIP sessions; media transfer; Codecs; Decoding; IP networks; Media; Multiplexing; Payloads; Protocols; RTP packet injection; SSRC multiplexing; VoIP; Voice recovery;

fLanguage

English

Publisher

ieee

Conference_Titel

Internet Multimedia Systems Architecture and Application (IMSAA), 2011 IEEE 5th International Conference on

Conference_Location

Bangalore, Karnataka

Print_ISBN

978-1-4577-1329-3

Type

conf

DOI

10.1109/IMSAA.2011.6156339

Filename

6156339