Advertisement

Verification of the Capability Exchange Signalling protocol

  • Lin Liu
  • Jonathan Billington
Special Section CPN 04/05

Abstract

The Capability Exchange Signalling (CES) protocol is one of the sub-protocols of recommendation H.245, “Control protocol for multimedia communication” issued by the International Telecommunication Union. In this paper, we model the CES protocol with Coloured Petri Nets and verify it using state space and language analyses. The results reveal that the CES protocol could fail when the sequence numbers used by the protocol wrap. To solve this problem, we propose a set of changes to the CES protocol. State space and language analyses are then applied to the revised protocol. Verification results suggest that the revised protocol satisfies the desired properties with the errors discovered being eliminated.

Keywords

Protocol verification Coloured Petri Nets Capability Exchange Signalling protocol State space analysis Language equivalence 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Andreasen, F., Foster, B.: Media Gateway Control Protocol (MGCP), RFC 3435. IETF (2003)Google Scholar
  2. 2.
    AT&T FSM LibraryTM. http://www.research.att.com/sw/tools/fsm/Google Scholar
  3. 3.
    AT&T Lextools. http://www.research.att.com/sw/tools/lextools/Google Scholar
  4. 4.
    Atwood, J.W., Ghodrat, M., Tasak, D.: Using Formal Specification and observers to specify and validate the ATM signalling protocols. In: Proceedings of the 24th conference on local computer networks (LCN’99), pp. 117–120 (1999)Google Scholar
  5. 5.
    Barrett W.A., Couch J.D. (1986). Compiler Construction: Theory and Practice, 2nd edn. Science Research Associates, Chicago Google Scholar
  6. 6.
    Billington, J.: Formal specification of protocols: protocol engineering. In Kent, A., Williams, J.G., Kent, R. (eds.) Encyclopedia of Microcomputers, vol. 7, pp. 299–314. Marcel Dekker, Inc., 1991Google Scholar
  7. 7.
    Billington, J., Gallasch, G.E., Han, B.: A Coloured petri net approach to protocol verification. In: Lectures on Concurrency and petri nets: Advances in Petri Nets, Lecture Notes in Computer Science, vol. 3098, pp. 210–290. Springer, Heidelberg (2004)Google Scholar
  8. 8.
    Design/CPN homepage. http://www.daimi.au.dk/designCPN/Google Scholar
  9. 9.
    Floreani, D.J., Billington, J.: Designing and verifying a communications gateway using colored petri nets and design/CPN. In: Proceedings of the 17th international conference on application and theory of petri nets (ICATPN’96), Lecture Notes in Computer Science, vol. 1091, pp. 153–171. Osaka, Springer, Heidelberg (1996)Google Scholar
  10. 10.
    Goode B. (2002). Voice over internet protocol (VoIP). Proc. IEEE 90(9): 1495–1517 CrossRefGoogle Scholar
  11. 11.
    Groves, C., Pantaleo, M., Anderson, T., Taylor, T.: RFC 3525, Gateway Control Protocol Version 1. IETF (2003)Google Scholar
  12. 12.
    H.323 Information Site. http://www.packetizer.com/voip/h323/Google Scholar
  13. 13.
    Holzmann G.J. (1990). Design and Validation of Computer Protocols. Prentice Hall, Englewood cliff Google Scholar
  14. 14.
    Hopcroft, J.E., Motwani, R., Ullman, J.D.: 2nd edn. Introduction to Automata Theory, Languages, and Computation. Addison-Wesley, Reading (2001)Google Scholar
  15. 15.
    Huecas, G., Mariz, J.L., Vinyes, J., Vazquez, E.: Specification of an ISDN Q.931 Entity Using the LOTOS Formal Description Technique. In: Proceedings of the 6th Mediterranean Electrotechnical Conference, pp. 522–525, May 1991Google Scholar
  16. 16.
    ITU-T. Recommendation G.722, 7 kHz Audio-Coding within 64 kbit/s (1988)Google Scholar
  17. 17.
    ITU-T. Recommendation H.261,Video Codec for Audiovisual Services at p × 64 kbit/s (1993)Google Scholar
  18. 18.
    ITU-T. Recommendation T.120, Data protocols for multimedia conferencing (1996)Google Scholar
  19. 19.
    ITU-T. Recommendation Z.120, Message Sequence Chart (MSC) (1996)Google Scholar
  20. 20.
    ITU-T. Recommendation Q.931, ISDN user-network interface layer 3 specification for basic call control (1998)Google Scholar
  21. 21.
    ITU-T. Recommendation Z.100, Specification and Description Language (SDL) (1999)Google Scholar
  22. 22.
    ITU-T. Recommendation H.225.0, Call signalling protocols and media stream packetization for packet-based multimedia communication systems (2003)Google Scholar
  23. 23.
    ITU-T. Recommendation H.323, Packet-based multimedia communications systems (2003)Google Scholar
  24. 24.
    ITU-T. Recommendation H.245, Control protocol for multimedia communication (2005)Google Scholar
  25. 25.
    ITU-T. Recommendation H.248.1, Gateway control protocol: Version 3 (2005)Google Scholar
  26. 26.
    Jensen, K.: Coloured Petri Nets: Basic Concepts, Analysis Methods and Practical Use, vol. 1, 2nd edn. Springer, (1997)Google Scholar
  27. 27.
    Jones, P.E.: Overview of H.323, June 2004. http://www. packetizer.com/voip/h323/papers/overview_of_h323.htmlGoogle Scholar
  28. 28.
    Kristensen L.M., Christensen S., Jensen K. (1998). The practitioner’s guide to coloured Petri nets. Int. J. Softw. Tools Technol. Transf. 2(2): 98–132 MATHCrossRefGoogle Scholar
  29. 29.
    Liu, L., Billington, J.: Modelling and analysis of internet multimedia protocols—Methodology and Initial Results. In: Proceedings of the 11th annual international symposium of the international council on systems engineering (INCOSE’01), CD-ROM, paper no. 3.2.4 (8 pages), Melbourne (2001)Google Scholar
  30. 30.
    Liu, L., Billington, J.: Modelling and analysis of the CES protocol of H.245. In: Proceedings of the 3rd workshop and tutorial on practical use of coloured petri nets and the CPN tools (CPN’01), pp. 95–114, Aarhus (2001)Google Scholar
  31. 31.
    Liu, L., Billington, J.: Tackling the infinite state space of a multimedia control protocol service specification. In: Proceedings of the 23rd international conference on application and theory of petri nets (ICATPN’02), Lecture Notes in Computer Science, vol. 2360, pp. 273–293. Springer, Heidelberg (2002)Google Scholar
  32. 32.
    Liu, L., Billington, J.: A Proof of the recursive formula for the infinite service language of the CES protocol. Technical report, CSEC-13, Computer Systems Engineering Centre, University of South Australia (2003) (revised in June 2004)Google Scholar
  33. 33.
    Liu, L., Billington, J.: Obtaining the service language for H.245’s multimedia capability exchange signalling protocol: the final step. In: Proceedings of the 10th international multi-media modelling conference (MMM’04), pp. 323–328. Brisbane (2004)Google Scholar
  34. 34.
    Liu, L., Billington, J.: Enhancing the CES protocol and its verification. In: Proceedings of the 6th workshop and tutorial on practical use of coloured petri nets and the CPN tools (CPN’05), pp. 59–78. Aarhus (2005)Google Scholar
  35. 35.
    Radovic, R., Crkvenac, I., Srbljic, S.: Formal Definition of SIP End Systems Behavior. In: Proceedings of the International Conference on Trends in Communications, Technical Program, vol. 2, pp. 293–296 IEEE (2001)Google Scholar
  36. 36.
    Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M., Schooler, E.: SIP: session initiation protocol, RFC 3261. IETF (2002)Google Scholar
  37. 37.
    Schulzrinne, H., Agboh, C.: Internet Draft, Session Initiation Protocol (SIP)-H.323 Interworking Requirements. IETF (2003)Google Scholar
  38. 38.
    Schulzrinne, H., Casner, S., Frederick, R., Jacobson, V.: RTP: A Transport Protocol for Real-Time Applications, RFC 3550. IETF (2003)Google Scholar
  39. 39.
    Wang, L., Agarwal, A., Atwood, J.W.: Description and validation of the media gateway control protocol (MGCP) Using SDL/MSC. In: Proceedings of the Canadian Conference on Electrical and Computer Engineering, vol. 2, pp. 993–998 IEEE (2001)Google Scholar
  40. 40.
    Wang L., Agarwal A., Atwood J.W. (2004). Modelling and verification of interworking between SIP and H.323. Comput. Netw. 45(5): 77–98 CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.School of Computer and Information ScienceUniversity of South AustraliaAdelaideAustralia
  2. 2.Computer Systems Engineering Centre, School of Electrical and Information EngineeringUniversity of South AustraliaMawson LakesAustralia

Personalised recommendations