TY - GEN
T1 - Communication quality of voice over TCP used for firewall traversal
AU - Yang, Hae Yong
AU - Lee, Kyung Hoon
AU - Ko, Sung Jea
PY - 2008
Y1 - 2008
N2 - 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 Skype's VoTCP section between a client and the client's 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%.
AB - 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 Skype's VoTCP section between a client and the client's 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%.
KW - Firewall traversal
KW - Qos
KW - Skype
KW - Voice over IP
KW - Voice over TCP
UR - http://www.scopus.com/inward/record.url?scp=54049145514&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=54049145514&partnerID=8YFLogxK
U2 - 10.1109/ICME.2008.4607363
DO - 10.1109/ICME.2008.4607363
M3 - Conference contribution
AN - SCOPUS:54049145514
SN - 9781424425716
T3 - 2008 IEEE International Conference on Multimedia and Expo, ICME 2008 - Proceedings
SP - 29
EP - 32
BT - 2008 IEEE International Conference on Multimedia and Expo, ICME 2008 - Proceedings
T2 - 2008 IEEE International Conference on Multimedia and Expo, ICME 2008
Y2 - 23 June 2008 through 26 June 2008
ER -