Communication quality of voice over TCP used for firewall traversal

Author

Yang, Hae-Yong ; Lee, Kyung-Hoon ; Ko, Sung-Jea

Author_Institution

Network & Comm. Security Div., Inst. of ETRI, Daejeon

fYear

2008

fDate

June 23 2008-April 26 2008

Firstpage

29

Lastpage

32

Abstract

As voice over IP (VoIP) services are becoming more widespread, UDP-restricted stateless firewalls (URSFs) have emerged as one of the main hurdles for deploying the service. By overcoming this obstacle, the new VoIP service Skype has gained rapid popularity. To traverse URSFs, Skype uses an abnormal transport method, namely voice over TCP (VoTCP). This paper investigates the effects of VoTCP on communication quality, and examines its operational network conditions. The experimental results show that the adoption of TCP for voice traffic causes a remarkable deterioration in the quality of service; however, VoTCP is applicable in a relatively clean network, such as the Skypepsilas VoTCP section between a client and the clientpsilas super node. More specifically, if the jitter buffer size is adequately tuned, VoTCP can operate at a random packet loss probability of less than 1.6%.

Keywords

Internet telephony; authorisation; peer-to-peer computing; quality of service; telecommunication security; telecommunication traffic; Skype; UDP-restricted stateless firewalls; VoIP; VoTCP; communication quality; firewall traversal; quality of service; voice over IP; voice over TCP; voice traffic; Computer crime; Convergence; Information security; Internet telephony; Jitter; Peer to peer computing; Quality of service; Research and development; TCPIP; Telecommunication traffic; QoS; Skype; firewall traversal; voice over IP; voice over TCP;

fLanguage

English

Publisher

ieee

Conference_Titel

Multimedia and Expo, 2008 IEEE International Conference on

Conference_Location

Hannover

Print_ISBN

978-1-4244-2570-9

Electronic_ISBN

978-1-4244-2571-6

Type

conf

DOI

10.1109/ICME.2008.4607363

Filename

4607363