1. D Angelos,Keromytis (2011). A Comprehensive Survey of Voice over IP Security Research. IEEE
2. Nor Shahniza,Kamal Bashah,Tore Jonvik,& Do Van Thanh (2010). A Mobile Service Architecture for improving Availability and Continuity. IEEE
3. Lu Tian,Nicolas Dailly,Qiao Qiao,Jihua Lu1,Jiannan Zhang,Jing Guo,Ji'ao Zhang (2010). Study of SIP Protocol Through VOIP Solution of Asterisk. IEEE
4. Chan Yeob,Yeun,Salman Mohammed,Al-Marzouqi (2009). Practical Implementations for Securing VOIP Enabled Mobile Devices. Third International Conference on Network and System Security -IEEE
5. Chung-Hsin Liu,Chun-Lin Lo (2009). The Study of the SIP for the VoIP. 2009 Fifth International Joint Conference on INC, IMS and IDC, 1473-1478.
6. Liancheng Shan,Ning Jiang (2009). Research on Security Mechanisms of SIP-Based VoIP System. 2009 Ninth International Conference on Hybrid Intelligent Systems, 408-410.
7. Robin Mohammed A Qadeer,Sarvat Kasana,Sayeed (2009). Encrypted Voice Calls with IP enabled Wireless Phones over GSM/ CDMA/ WiFi Networks. International Conference on Computer Engineering and Technology
8. Pablo Montoro,Eduardo Casilari (2009). A Comparative Study of VOIP Standards with Asterisk. Fourth International Conference on Digital Telecommunications-IEEE
9. Theo Zourzouvillys,Eric Rescorla (2009). An Introduction to Standards-Based VoIP: SIP, RTP, and Friends. IEEE Internet Computing, 14(2), 69-73.
10. Ahmad Ali Habeeb,Mohammed Qadeer,Shamshir Ahmad (2007). Voice Communication over GGSN/SGSN. IEEE
11. P Thermos,A Takanen (2007). Securing VOIP Networks: Threats, Vulnerabilities, and Countermeasures. Securing VOIP Networks: Threats, Vulnerabilities, and Countermeasures
12. Tuneesh Lella,Riccardo Bettati (2007). Privacy of encrypted voice-over-IP. 2007 IEEE International Conference on Systems, Man and Cybernetics, 3063-3068.
13. D Kuhn,T Walsh,S Fries (2005). Security considerations for Voice Over IP Systems. Security considerations for Voice Over IP Systems
14. T Abbasi,S Prasad,N Seddigh,I Lambadaris (2003). A comparative study of the SIP and IAX VoIP protocols. Canadian Conference on Electrical and Computer Engineering, 2005., 179-183.
15. Q Shen (2003). Performance of VOIP over GPRS. Advanced Information Networking and Applications 17th International Conference, 17.
16. At&t Goode,Weston Labs (2002). Voice over Internet protocol (VOIP). Voice over Internet protocol (VOIP)
17. J Rosenberg,H Schulzrinne,G Camarillo,A Johnston,J Peterson,R Sparks,M Handley,E Schooler (2002). SIP: Session Initiation Protocol. Internet Engineering Task Force (IETF)
18. R Kalden,I Meirick,M Meyer (2002). Wireless Internet access based on GPRS. IEEE Personal Communications, 7(2), 8-18.
19. D Si,Q Long,X Han,W Zou (2002). Security mechanisms for SIP-based multimedia communication infrastructure. IEEE Conf. on Comm, Circuits and Systems (ICCCAS)
20. Phone Lin,Yi-Bing Lin (2001). Channel allocation for GPRS. IEEE
21. J Mcnair,I Akyildiz,M Bender (2000). An inter-system handoff technique for the IMT-2000 system. Proceedings IEEE INFOCOM 2000. Conference on Computer Communications. Nineteenth Annual Joint Conference of the IEEE Computer and Communications Societies (Cat. No.00CH37064), 1, 208-216.
22. J Dimarzio (2009). Android A programmers guide. McGraw Hill mobile Communication
23. William Stallings (2007). Web-Based Security Protocols. Encyclopedia of Cryptography and Security, 1383-1384.
24. J Van Meggelen,J Smith,L Madsen (2007). Asterisk: The Future of Telephony. Asterisk: The Future of Telephony
25. Emmanuel Seurre,Patrick Savelli,Pierre-Jean Pietri (2003). GPRS for mobile Internet. GPRS for mobile Internet
26. J Regis,Bates (2002). General Packet Radio Services.
