Title :
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
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;
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
DOI :
10.1109/IMSAA.2011.6156339
