Voice over Internet Protocol (VoIP) is a form of voice
communication that uses audio data to transmit voice signals to the
end user. VoIP is one of the most important technologies in the
World of communication. Around, 20 years of research on VoIP,
some problems of VoIP are still remaining. During the past decade
and with growing of wireless technologies, we have seen that many
papers turn their concentration from Wired-LAN to Wireless-LAN.
VoIP over Wireless LAN (WLAN) faces many challenges due to the
loose nature of wireless network. Issues like providing Quality of
Service (QoS) at a good level, dedicating capacity for calls and
having secure calls is more difficult rather than wired LAN.
Therefore VoIP over WLAN (VoWLAN) remains a challenging
research topic. In this paper we consolidate and address major
VoWLAN issues. This research is helpful for those researchers wants
to do research in Voice over IP technology over WLAN network.
[1] J.B. Meisel, M. Needles, Voice over Internet protocol (VoIP)
development and public policy implications, Info 7, 2005.
[2] M. ALAkhras, "Quality of Media Traffic over Lossy Internet Protocol
Networks: Measurement and Improvement", Software Technology
Research Laboratory, De Montfort University, United Kingdom, PhD
thesis, 2007
[3] V. Mockapetris, "Telephony's next act", in IEEE Spectrum, vol.43, Issue
4, pp. 1-5, 29 April 2006.
[4] K. Dileep, A. Saleem and R. Yeonseung , "Quality of Service (QoS) of
Voice over MAC Protocol 802.11 using NS-2", JCIT: Journal of
Convergence Information Technology, Vol. 3, No. 4, pp. 76 ~ 83, 2008
[5] G. Samrat, B. Sudeept, VoIP: wireless, P2P and new enterprise voice
over IP, 2008.
[6] J.M. Lozano-Gendreau, A.Z. Halabi, M. Choueiri and V. Besong,
"VoWF (Vo-IP over Wi-Fi)," Electronics, Communications and
Computers, 2006. CONIELECOMP 2006. 16th International
Conference on , vol., no., pp. 2- 2, 27-01 Feb. 2006.
[7] H. Yong-feng, Z. Jiang-ling, "Implementation of ITU-T G. 729 speech
codec in IP telephony gateway" Wuhan University Journal of Natural
Sciences, Volume 5, Number 2, June 2000, pages 159-163.
[8] C. Lin, X. Yang, S. Xuemin and W.M. Jon, "VoIP over WLAN: Voice
capacity, admission control, QoS, and MAC", International Journal of
communication Systems, Vol.19, No 4, pp. 491-508, May 2006.
[9] P. M. Athina., A. T. Fouad and J. K. Mansour, "Assessing the Quality
of Voice Communications Over Internet Backbones", IEEE/ACM
Transactions on Networking, Vol. 11, No. 5, Oct. 2003.
[10] R. P. Swale, "VoIP ÔÇö Panacea or PIG's Ear?" BT Technology Journal,
v.19 n.2, p.9-22, April 2001.
[11] F. Maguolo, F. De Pellegrini, A. Zanella and M. Zorzi "Cross-Layer
solutions to performance problems in VOIP over WLANS" in
Proceedings of EUSIPCO, September 4-8, 2006 in Florence, Italy.
[12] B. Lipiczky, "Chapter10- Voice over WLAN," Information security
management handbook, s.l. : Auerbach Publications, pp. 145-153.
[13] Q. Cao, T. Li, Tianji and D. Leith "Achieving fairness in Lossy 802.11e
wireless multi-hop Mesh networks", In: Third IEEE International
Workshop on Enabling Technologies and Standards for Wireless Mesh
Networking MESH, Macau SAR, P.R. China pp. 1-7, 2009.
[14] P. Dini, O. Font-Bach and J. Mangues-Bafalluy, "Experimental analysis
of VoIP call quality support in IEEE 802.11 DCF," Communication
Systems, Networks and Digital Signal Processing, 2008. 6th
International Symposium, pp. 443 - 44729 August 2008.
[15] T. Li, Q. Ni, T. Turletti, Xiao "Performance analysis of the IEEE
802.11e block ACK scheme in a noisy channel", Broadband Networks,
2005. 2nd International Conference. Hamilton Inst. Ireland, Vol 1, pp.
511-517, 13 February 2006.
[16] Q. Ni, T. Li, T. Turletti, and Y. Xiao. "Saturation Throughput Analysis
of Error-Prone 802.11 Wireless Networks". Wiley Journal of Wireless
Communications and Mobile Computing (JWCMC), INRIA, France,
Vol. 5, Issue 8, pp. 945-956. December 2005.
[17] W. Wang, S. Liew and V. Li, "Solutions to performance problems in
VoIP over a 802.11 wireless LAN", Journal of IEEE transactions on
vehicular technology, New York , USA, Vol. 54, pp. 366-384, 2005.
[18] S. Ahmed, X. Jiang, P. Ho and S. Horiguchi, "Wireless Access Point
Voice Capacity Analysis and Enhancement Based on Clients- Spatial
Distribution", Multi- media Communication., San Diego, CA, Vol 58,
pp. 2597 - 2603, 11 June 2009
[19] B. Forouzan, "Data Communications and Networking", Mcgraw - Hill
International Edition, Fourth Edition, International Edition 2007.
[20] G. Cantieni, Q. Ni, C. Barakat and T. Turletti "Performance analysis
under finite load and improvements for multirate 802.11", Computer
Communications, Science Direct, Elsevier B.V, Newton, MA, USA,
Vol 28, Issue 10, pp. 1095-1109, June 2005.
[21] T. Li, Q. Ni, T. Turletti and Y. Xiao "Achieving fairness in Lossy
802.11e wireless multi-hop Mesh networks", Broadband Networks,
2005. 2nd International Conference. Hamilton Inst. Ireland, Vol 1, pp.
511-517, 13 February 2006
[22] H. Wu, Y. Peng, K. Long, S. Cheng and J. Ma, "Performance of reliable
transport protocol over IEEE 802.11 wireless LAN: analysis and
enhancement," INFOCOM 2002. 21st Annual Joint Conference of the
IEEE Computer and Communications Societies. Proceedings. IEEE,
Vol. 2 Isssue 2002, pp. 599-607 07 November 2002.
[23] Q. Ni, L. Romdhani, T. Turletti, and I. Aad, "QoS Issues and
Enhancements for IEEE 802.11 Wireless LAN", INRIA Research
Report, No. 4612, pp.1-33, November 2002.
[24] Y. Xiao, and J. Rosdahl, "Throughput and Delay Limits of IEEE
802.11", IEEE COMMUNICATIONS LETTERS, Vol. 6, No. 8, pp. 335-
357, August 2002.
[25] M. Habib, N. Bulusu, "Improving QoS of VoIP over WLAN (IQ-VW)",
Project Research Paper, for CS522 Computer Communications,
University of Colorado at Colorado Springs, December 2002.
[26] X. Chen, Ch. Wang, D. Xuan, Z. Li, Y. Min and Wei Zhao, "Survey on
QoS Management of VoIP," iccnmc, pp.69, 2003 International
Conference on Computer Networks and Mobile Computing
(ICCNMC'03), 2003
[27] A.H. M. Amin, "VoIP Performance Measurement Using QoS
Parameters". The Second International Conference on Innovations in
Information Technology (IIT-05).
[28] S. Sahabudin, M.Y. Alias, "End-to end delay performance analysis of
various codecs on VoIP Quality of Service," Communications (MICC),
2009 IEEE 9th Malaysia International Conference on , vol., no., pp.607-
612, 15-17 Dec. 2009
[29] M. Hassan, A. Nayandoro, M.Atiquzzaman, "Internet Telephony:
Services, Technical Challenges, and Products", IEEE Communications
Magazine, pp. 96-103, April 2000
[30] S. A. Ahson, M. Ilyas, "VoIP Handbook Applications,Technologies,
Reliability and Security", Taylor and Francis group new York, 2009
[31] J. Liu, Z. Niu, "An adaptive receiver buffer adjust algorithm for VoIP
applications considering voice characters," Proc. 10th Asia-Pacific Conf.
on Comm., Vol.2, pp.597-601, Beijing, China, August 2004.
[32] M. Narbutt, L. Murphy, "A New VoIP Adaptive Playout Algorithm",
Proc. of the IEEE QoS 2004 Conf., London, 2004
[33] K. M. McNeill, M. Liu and J. J. Rodriguez, "An Adaptive Jitter Buffer
PlayOut Scheme to Improve VoIP Quality in Wireless Networks", IEEE
Conf. on BAE Systems Network Enabled Solutions, Washington, 2006
[34] S. Karapantazis, F. P. Stylianos, "VoIP: A comprehensive survey on a
promising technology", Computer Networks, Vol. 53, 2050-2090, 2009
[35] M.E. Nasr, S.A. Napoleon, "On improving voice quality degraded by
packet loss in data networks," AFRICON, 2004. 7th AFRICON
Conference in Africa , vol.1, no., pp.51-55 Vol.1, 17-17 Sept. 2004
[36] J. Korhonen, Y. Wang, "Effect of packet size on loss rate and delay in
wireless links," Wireless Communications and Networking Conference,
2005 IEEE , vol.3, no., pp. 1608- 1613 Vol. 3, 13-17 March 2005
[37] L. Mintandjian, P.A. Naylor, "A Study Of Echo In Voip Systems And
Synchronous Convergence Of The ╬╝-Law Pnlms Algorithm", 14th
European Signal Processing Conference (EUSIPCO 2006), Florence,
Italy, September 4-8, 2006.
[38] IEEE Standard for Information technologyÔÇöTelecommunications and
information exchange between systemsÔÇöLocal and metropolitan area
networksÔÇöSpecific requirements Part 11: "Wireless LAN Medium
Access Control (MAC) and Physical Layer (PHY) Specifications"
[39] D. Rodellar L. Gannoune and S. Robert, "A survey of QoS Techniques
and Enhancements for IEEE 802.11b Wireless LAN's", Technical report,
EIVD-Swisscom, May 2003.
[40] M. Ergen, S.C. Ergen, P.Varaiya, "Throughput performance of a
wireless VoIP model with packet aggregation in IEEE 802.11", Wireless
Communications and Networking Conference, WCNC 2006. IEEE,
vol.4, no., pp.2235-2239, 3-6 April 2006.
[41] M. Ergen, S.C. Ergen, P.Varaiya, "Throughput performance of a
wireless VoIP model with packet aggregation in IEEE 802.11," Wireless
Communications and Networking Conference, 2006. WCNC 2006.
IEEE, vol.4, no., pp.2235-2239, 3-6 April 2006
[42] M .Ashraf, A. Jayasuriya, "Rate Adaptive Channel MAC", Springer. p.
444-449, 2009
[43] S. Ci; H. Sharif, "Adaptive approaches to enhance throughput of IEEE
802.11 wireless LAN with bursty channel," Local Computer Networks,
2000. LCN 2000. Proceedings. 25th Annual IEEE Conference on , vol.,
no., pp.44-45, 2000
[44] A. Sfairopoulou, B. Bellalta, and C. Macian, "How to tune voip codec
selection in wlans?" IEEE Communications Letters, vol. 12, Issue 8, pp.
551 - 553, August 2008.
[45] L. Cai, X. Shen, J.W Mark, Y. Xiao , "Voice capacity analysis of WLAN
with unbalanced traffic," Quality of Service in Heterogeneous
Wired/Wireless Networks, 2005. Second International Conference on ,
vol., no., pp.8 pp.-9, 24-24 Aug. 2005.
[46] R. J. B. Reynolds, A. W. Rix, "Quality VoIP ÔÇö An Engineering
Challenge," BT Technology Journal, vol. 19, no. 2, pp. 23-32, 2001.
[47] ITU-T Recommendation P.800, Methods for Subjective Determination
of Transmission Quality, August 1996.
[48] F. De Rango, M. Tropea, P. Fazio, S. Marano, "Overview on VoIP:
Subjective & Objective Measurement Methods", IEEE Published Paper.
[49] ITU-T Recommendation P.861, Objective quality measurement of
telephone band (300-3400 Hz) speech codecs, 1998
[50] ITU-T Recommendation P.862, Perceptual evaluation of speech quality
(PESQ): An objective method for end-to-end speech quality assessment
of narrow-band telephone networks and speech codecs, 2001
[51] ITU-T Recommendation P.561, In-service non-intrusive measurement
device - Voice service measurements, 2002
[52] ITU-T Recommendation P.562, Analysis and interpretation of INMD
voice-service measurements, 2004
[53] ITU-T Recommendation P.563, Single-ended method for objective
speech quality assessment in narrow-band telephony applications, 2004
[54] RTP Control Protocol Extended Reports (RTCP XR), November 2003.
http://www.apps.ietf.org/rfc/rfc3611.html
[55] Garuba, M.; Jiang Li; Zhenqiang Yi; , "Security in the New Era of
Telecommunication: Threats, Risks and Controls of VoIP," Information
Technology: New Generations, ITNG 2008. Fifth International
Conference on, vol., no., pp.587-591, 7-9 April 2008
[56] D. Butcher, L. Xiangyang, and G. Jinhua, "Security Challenge and
Defense in VoIP Infrastructures", Systems, Man, and Cybernetics, Part
C: Applications and Reviews, IEEE Transactions on, vol. 37, no. 6, pp.
1152-1162, 2007.
[57] C. K. H. Patrick, M. Miguel Vargas, "Security Issues in VOIP
Applications," in Electrical and Computer Engineering, CCECE '06.
Canadian Conference on, 2006, pp. 2361-2364.
[58] H. Abdelnur, R. State and O. Festor, "Advanced fuzzing in the VoIP
space," Journal in Computer Virology, Volume 6, pages 57-64, Number
1, February 2008.
[59] D. R. Kuhn, T. J. Walsh, S. Fries "Security Considerations for Voice
over IP Systems", National Institute of Standards and Technology.
[60] R. Stanton, "Secure VoIP - an achievable goal," Computer Fraud &
Security, vol. 2006, pp. 11-14, 2006.
[1] J.B. Meisel, M. Needles, Voice over Internet protocol (VoIP)
development and public policy implications, Info 7, 2005.
[2] M. ALAkhras, "Quality of Media Traffic over Lossy Internet Protocol
Networks: Measurement and Improvement", Software Technology
Research Laboratory, De Montfort University, United Kingdom, PhD
thesis, 2007
[3] V. Mockapetris, "Telephony's next act", in IEEE Spectrum, vol.43, Issue
4, pp. 1-5, 29 April 2006.
[4] K. Dileep, A. Saleem and R. Yeonseung , "Quality of Service (QoS) of
Voice over MAC Protocol 802.11 using NS-2", JCIT: Journal of
Convergence Information Technology, Vol. 3, No. 4, pp. 76 ~ 83, 2008
[5] G. Samrat, B. Sudeept, VoIP: wireless, P2P and new enterprise voice
over IP, 2008.
[6] J.M. Lozano-Gendreau, A.Z. Halabi, M. Choueiri and V. Besong,
"VoWF (Vo-IP over Wi-Fi)," Electronics, Communications and
Computers, 2006. CONIELECOMP 2006. 16th International
Conference on , vol., no., pp. 2- 2, 27-01 Feb. 2006.
[7] H. Yong-feng, Z. Jiang-ling, "Implementation of ITU-T G. 729 speech
codec in IP telephony gateway" Wuhan University Journal of Natural
Sciences, Volume 5, Number 2, June 2000, pages 159-163.
[8] C. Lin, X. Yang, S. Xuemin and W.M. Jon, "VoIP over WLAN: Voice
capacity, admission control, QoS, and MAC", International Journal of
communication Systems, Vol.19, No 4, pp. 491-508, May 2006.
[9] P. M. Athina., A. T. Fouad and J. K. Mansour, "Assessing the Quality
of Voice Communications Over Internet Backbones", IEEE/ACM
Transactions on Networking, Vol. 11, No. 5, Oct. 2003.
[10] R. P. Swale, "VoIP ÔÇö Panacea or PIG's Ear?" BT Technology Journal,
v.19 n.2, p.9-22, April 2001.
[11] F. Maguolo, F. De Pellegrini, A. Zanella and M. Zorzi "Cross-Layer
solutions to performance problems in VOIP over WLANS" in
Proceedings of EUSIPCO, September 4-8, 2006 in Florence, Italy.
[12] B. Lipiczky, "Chapter10- Voice over WLAN," Information security
management handbook, s.l. : Auerbach Publications, pp. 145-153.
[13] Q. Cao, T. Li, Tianji and D. Leith "Achieving fairness in Lossy 802.11e
wireless multi-hop Mesh networks", In: Third IEEE International
Workshop on Enabling Technologies and Standards for Wireless Mesh
Networking MESH, Macau SAR, P.R. China pp. 1-7, 2009.
[14] P. Dini, O. Font-Bach and J. Mangues-Bafalluy, "Experimental analysis
of VoIP call quality support in IEEE 802.11 DCF," Communication
Systems, Networks and Digital Signal Processing, 2008. 6th
International Symposium, pp. 443 - 44729 August 2008.
[15] T. Li, Q. Ni, T. Turletti, Xiao "Performance analysis of the IEEE
802.11e block ACK scheme in a noisy channel", Broadband Networks,
2005. 2nd International Conference. Hamilton Inst. Ireland, Vol 1, pp.
511-517, 13 February 2006.
[16] Q. Ni, T. Li, T. Turletti, and Y. Xiao. "Saturation Throughput Analysis
of Error-Prone 802.11 Wireless Networks". Wiley Journal of Wireless
Communications and Mobile Computing (JWCMC), INRIA, France,
Vol. 5, Issue 8, pp. 945-956. December 2005.
[17] W. Wang, S. Liew and V. Li, "Solutions to performance problems in
VoIP over a 802.11 wireless LAN", Journal of IEEE transactions on
vehicular technology, New York , USA, Vol. 54, pp. 366-384, 2005.
[18] S. Ahmed, X. Jiang, P. Ho and S. Horiguchi, "Wireless Access Point
Voice Capacity Analysis and Enhancement Based on Clients- Spatial
Distribution", Multi- media Communication., San Diego, CA, Vol 58,
pp. 2597 - 2603, 11 June 2009
[19] B. Forouzan, "Data Communications and Networking", Mcgraw - Hill
International Edition, Fourth Edition, International Edition 2007.
[20] G. Cantieni, Q. Ni, C. Barakat and T. Turletti "Performance analysis
under finite load and improvements for multirate 802.11", Computer
Communications, Science Direct, Elsevier B.V, Newton, MA, USA,
Vol 28, Issue 10, pp. 1095-1109, June 2005.
[21] T. Li, Q. Ni, T. Turletti and Y. Xiao "Achieving fairness in Lossy
802.11e wireless multi-hop Mesh networks", Broadband Networks,
2005. 2nd International Conference. Hamilton Inst. Ireland, Vol 1, pp.
511-517, 13 February 2006
[22] H. Wu, Y. Peng, K. Long, S. Cheng and J. Ma, "Performance of reliable
transport protocol over IEEE 802.11 wireless LAN: analysis and
enhancement," INFOCOM 2002. 21st Annual Joint Conference of the
IEEE Computer and Communications Societies. Proceedings. IEEE,
Vol. 2 Isssue 2002, pp. 599-607 07 November 2002.
[23] Q. Ni, L. Romdhani, T. Turletti, and I. Aad, "QoS Issues and
Enhancements for IEEE 802.11 Wireless LAN", INRIA Research
Report, No. 4612, pp.1-33, November 2002.
[24] Y. Xiao, and J. Rosdahl, "Throughput and Delay Limits of IEEE
802.11", IEEE COMMUNICATIONS LETTERS, Vol. 6, No. 8, pp. 335-
357, August 2002.
[25] M. Habib, N. Bulusu, "Improving QoS of VoIP over WLAN (IQ-VW)",
Project Research Paper, for CS522 Computer Communications,
University of Colorado at Colorado Springs, December 2002.
[26] X. Chen, Ch. Wang, D. Xuan, Z. Li, Y. Min and Wei Zhao, "Survey on
QoS Management of VoIP," iccnmc, pp.69, 2003 International
Conference on Computer Networks and Mobile Computing
(ICCNMC'03), 2003
[27] A.H. M. Amin, "VoIP Performance Measurement Using QoS
Parameters". The Second International Conference on Innovations in
Information Technology (IIT-05).
[28] S. Sahabudin, M.Y. Alias, "End-to end delay performance analysis of
various codecs on VoIP Quality of Service," Communications (MICC),
2009 IEEE 9th Malaysia International Conference on , vol., no., pp.607-
612, 15-17 Dec. 2009
[29] M. Hassan, A. Nayandoro, M.Atiquzzaman, "Internet Telephony:
Services, Technical Challenges, and Products", IEEE Communications
Magazine, pp. 96-103, April 2000
[30] S. A. Ahson, M. Ilyas, "VoIP Handbook Applications,Technologies,
Reliability and Security", Taylor and Francis group new York, 2009
[31] J. Liu, Z. Niu, "An adaptive receiver buffer adjust algorithm for VoIP
applications considering voice characters," Proc. 10th Asia-Pacific Conf.
on Comm., Vol.2, pp.597-601, Beijing, China, August 2004.
[32] M. Narbutt, L. Murphy, "A New VoIP Adaptive Playout Algorithm",
Proc. of the IEEE QoS 2004 Conf., London, 2004
[33] K. M. McNeill, M. Liu and J. J. Rodriguez, "An Adaptive Jitter Buffer
PlayOut Scheme to Improve VoIP Quality in Wireless Networks", IEEE
Conf. on BAE Systems Network Enabled Solutions, Washington, 2006
[34] S. Karapantazis, F. P. Stylianos, "VoIP: A comprehensive survey on a
promising technology", Computer Networks, Vol. 53, 2050-2090, 2009
[35] M.E. Nasr, S.A. Napoleon, "On improving voice quality degraded by
packet loss in data networks," AFRICON, 2004. 7th AFRICON
Conference in Africa , vol.1, no., pp.51-55 Vol.1, 17-17 Sept. 2004
[36] J. Korhonen, Y. Wang, "Effect of packet size on loss rate and delay in
wireless links," Wireless Communications and Networking Conference,
2005 IEEE , vol.3, no., pp. 1608- 1613 Vol. 3, 13-17 March 2005
[37] L. Mintandjian, P.A. Naylor, "A Study Of Echo In Voip Systems And
Synchronous Convergence Of The ╬╝-Law Pnlms Algorithm", 14th
European Signal Processing Conference (EUSIPCO 2006), Florence,
Italy, September 4-8, 2006.
[38] IEEE Standard for Information technologyÔÇöTelecommunications and
information exchange between systemsÔÇöLocal and metropolitan area
networksÔÇöSpecific requirements Part 11: "Wireless LAN Medium
Access Control (MAC) and Physical Layer (PHY) Specifications"
[39] D. Rodellar L. Gannoune and S. Robert, "A survey of QoS Techniques
and Enhancements for IEEE 802.11b Wireless LAN's", Technical report,
EIVD-Swisscom, May 2003.
[40] M. Ergen, S.C. Ergen, P.Varaiya, "Throughput performance of a
wireless VoIP model with packet aggregation in IEEE 802.11", Wireless
Communications and Networking Conference, WCNC 2006. IEEE,
vol.4, no., pp.2235-2239, 3-6 April 2006.
[41] M. Ergen, S.C. Ergen, P.Varaiya, "Throughput performance of a
wireless VoIP model with packet aggregation in IEEE 802.11," Wireless
Communications and Networking Conference, 2006. WCNC 2006.
IEEE, vol.4, no., pp.2235-2239, 3-6 April 2006
[42] M .Ashraf, A. Jayasuriya, "Rate Adaptive Channel MAC", Springer. p.
444-449, 2009
[43] S. Ci; H. Sharif, "Adaptive approaches to enhance throughput of IEEE
802.11 wireless LAN with bursty channel," Local Computer Networks,
2000. LCN 2000. Proceedings. 25th Annual IEEE Conference on , vol.,
no., pp.44-45, 2000
[44] A. Sfairopoulou, B. Bellalta, and C. Macian, "How to tune voip codec
selection in wlans?" IEEE Communications Letters, vol. 12, Issue 8, pp.
551 - 553, August 2008.
[45] L. Cai, X. Shen, J.W Mark, Y. Xiao , "Voice capacity analysis of WLAN
with unbalanced traffic," Quality of Service in Heterogeneous
Wired/Wireless Networks, 2005. Second International Conference on ,
vol., no., pp.8 pp.-9, 24-24 Aug. 2005.
[46] R. J. B. Reynolds, A. W. Rix, "Quality VoIP ÔÇö An Engineering
Challenge," BT Technology Journal, vol. 19, no. 2, pp. 23-32, 2001.
[47] ITU-T Recommendation P.800, Methods for Subjective Determination
of Transmission Quality, August 1996.
[48] F. De Rango, M. Tropea, P. Fazio, S. Marano, "Overview on VoIP:
Subjective & Objective Measurement Methods", IEEE Published Paper.
[49] ITU-T Recommendation P.861, Objective quality measurement of
telephone band (300-3400 Hz) speech codecs, 1998
[50] ITU-T Recommendation P.862, Perceptual evaluation of speech quality
(PESQ): An objective method for end-to-end speech quality assessment
of narrow-band telephone networks and speech codecs, 2001
[51] ITU-T Recommendation P.561, In-service non-intrusive measurement
device - Voice service measurements, 2002
[52] ITU-T Recommendation P.562, Analysis and interpretation of INMD
voice-service measurements, 2004
[53] ITU-T Recommendation P.563, Single-ended method for objective
speech quality assessment in narrow-band telephony applications, 2004
[54] RTP Control Protocol Extended Reports (RTCP XR), November 2003.
http://www.apps.ietf.org/rfc/rfc3611.html
[55] Garuba, M.; Jiang Li; Zhenqiang Yi; , "Security in the New Era of
Telecommunication: Threats, Risks and Controls of VoIP," Information
Technology: New Generations, ITNG 2008. Fifth International
Conference on, vol., no., pp.587-591, 7-9 April 2008
[56] D. Butcher, L. Xiangyang, and G. Jinhua, "Security Challenge and
Defense in VoIP Infrastructures", Systems, Man, and Cybernetics, Part
C: Applications and Reviews, IEEE Transactions on, vol. 37, no. 6, pp.
1152-1162, 2007.
[57] C. K. H. Patrick, M. Miguel Vargas, "Security Issues in VOIP
Applications," in Electrical and Computer Engineering, CCECE '06.
Canadian Conference on, 2006, pp. 2361-2364.
[58] H. Abdelnur, R. State and O. Festor, "Advanced fuzzing in the VoIP
space," Journal in Computer Virology, Volume 6, pages 57-64, Number
1, February 2008.
[59] D. R. Kuhn, T. J. Walsh, S. Fries "Security Considerations for Voice
over IP Systems", National Institute of Standards and Technology.
[60] R. Stanton, "Secure VoIP - an achievable goal," Computer Fraud &
Security, vol. 2006, pp. 11-14, 2006.
@article{"International Journal of Electrical, Electronic and Communication Sciences:61465", author = "Haniyeh Kazemitabar and Sameha Ahmed and Kashif Nisar and Abas B Said and Halabi B Hasbullah", title = "A Survey on Voice over IP over Wireless LANs", abstract = "Voice over Internet Protocol (VoIP) is a form of voice
communication that uses audio data to transmit voice signals to the
end user. VoIP is one of the most important technologies in the
World of communication. Around, 20 years of research on VoIP,
some problems of VoIP are still remaining. During the past decade
and with growing of wireless technologies, we have seen that many
papers turn their concentration from Wired-LAN to Wireless-LAN.
VoIP over Wireless LAN (WLAN) faces many challenges due to the
loose nature of wireless network. Issues like providing Quality of
Service (QoS) at a good level, dedicating capacity for calls and
having secure calls is more difficult rather than wired LAN.
Therefore VoIP over WLAN (VoWLAN) remains a challenging
research topic. In this paper we consolidate and address major
VoWLAN issues. This research is helpful for those researchers wants
to do research in Voice over IP technology over WLAN network.", keywords = "Capacity, QoS, Security, VoIP Issues, WLAN.", volume = "4", number = "11", pages = "1669-7", }
