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Ensuring IMS Network Integrity: The Continuing Need for Interoperability Testing

This paper discusses the importance of ongoing interoperability testing in a standardized IMS network, covering factors like IMS uniqueness, testing methodologies, security concerns, migration challenges, QoS issues, managed SIP interoperability, and the evolving nature of mobile networks. It emphasizes the necessity of comprehensive testing methods and the impact of changes on the network’s overall performance and reliability.

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Ensuring IMS Network Integrity: The Continuing Need for Interoperability Testing

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  1. The Importance Of Continued Interoperability Testing In A Standardized IMS Network Pierre Lynch Director, IMS and Wireless Strategy, Ixia

  2. Introduction • What makes IMS special? • Motivations • Testing Methodologies • Summary

  3. AS SCIM PSTN S-CSCF I-CSCF P-CSCF PDF HSS AS AS MGCF MRFC MRFP MGW BGCF MRFC Distributed Architecture Application Layer Control Layer Transport Layer IP CAN

  4. Data • Migration • Location and multiplicity • IMS and Non-IMS services • Centralized vs Non Centralized • Maintenance • changes AS Sh AS HSS Cx AS ISC X-CSCF

  5. Spoofing DDoS Virus Authentication/AKA IPSec and TLS Resource and Admission Control SLA Enforcement Za Interface . . . Theft of Service Eavesdropping Identity and InfoTheft Security

  6. Security • Multiple levels • Application • Transport • Access • Authentication • Specs address some aspects, but not all • AKA and IPSec • SEG • RACS • Other Stds Bodies have added to 3GPP security • TISPAN • PacketCable

  7. Access Network PDF Resource and Admission Control • Extremely important aspect of NGN • Standards Bodies adopted different mechanisms • Policies must be synchronized with applications

  8. QoS • Unknown QoS in some access networks • Mechanisms within own core network Managed ? Managed

  9. SIP Interoperability • Varying degrees of conformance • Sill much discussion on interoperability • Evolving constantly • Mobility -> the Ultimate Interop Challenge Away Home

  10. Dependencies • SEG • Network Address Translation • Protocol translation Access Network

  11. Internet Access Network PSTN Testing Methods • At the Edges • As much real equipment as possible • Simulate the rest Other IMS Other IMS Internet PSTN UEs AN + UEs

  12. Testing Methods • QoS Evaluation • Transport Level • Referential • Impairments • Security Testing • DDOS • Spoofing • Virus • RACS Testing • Overload • Control signaling bombing • Dependencies • Regression • Interoperability • Regression • Develop tests with multiple SIP profiles for mobility

  13. Summary • Motivations • Distributed Architecture • Multi-Vendor Solutions • Data Migration • Multiple Impacts of Changes • Dependencies introduced by units • Testing • Test all changes • Periodic frequent regression • Automated and unattended • Include media and OoS • If Mobile, test multiple UE profiles

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