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Testing Large Scale SIP Networks

Discover the basics of SIP testing including call simulation, call monitoring, signaling analysis, and media analysis. Learn how to stress test network elements and services in order to determine performance figures and identify potential problems.

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Testing Large Scale SIP Networks

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  1. Testing Large Scale SIP Networks Ofir Michael Director VoIP technology, RADCOM. ofirm@radcom.com

  2. Agenda • SIP testing – advanced scenarios • SIP testing - Real Life Examples

  3. Test Equipment Requirements

  4. SIP Testing – the basics • Call simulation • Call monitoring • Signaling analysis • Media analysis • Conformance testing • Load (stress) generation

  5. Advanced testing Benchmarking Performance Media degradation Envelope determination In terms of a large network… For complex scenarios: Many users Many call flows Different codecs Different networking configuration NAT, Firewall… Advanced SIP Testing

  6. Stress Testing?? • Aimed at determining the operational envelope: • Network elements • Service • Certain concept / design • Why stress test: • Vendors: wants to determine performance figures before shipping • Service Providers: wants to find the problems in the lab

  7. Stress Testing! Not just “number of calls” • Emulate a network wide environment: • Large number of users • Many network elements (IPs) • Emulate NAT • Excessive call load • Many profiles / scenarios • Many different services

  8. What are we looking for Predicting the element behavior in real life: • How does the UUT (network element / service) behave in real life (=stress…) • Where is the “breaking point” • What happens at the “breaking point” • How are new / existing calls affected? • Is the media degraded?

  9. Stress Factors • Basic call flows (signaling) • RTP streams • Media type (Video, Audio) • Advanced call flows • SIP services

  10. Signaling Stress Requirements • Generate and respond to SIP service requests • Simulate User Agent Client / Server communication procedures (RFC 3261) • Emulate behavior of one or many SIP phones • different signaling and media parameters for each

  11. Registration Rate • True emulation of user behaviour • Generate calls only when registered • Mega-blast generation of registration events • Full configuration of SIP registration procedures • Mimic real user behaviour

  12. Advanced Testing Requirements (1) • Multiple users • 100,000’s UACs • Configurable groups each with different behavior profiles • Multiple IPs • 1000s of IPs - both media and signaling • Multiple MACs • Multiple VLANs

  13. Advanced Testing Requirements -- 2 • Full SIP message customization • Video generation • DTMF generation • Different call flows: • Hold, Consultation Hold, Music on Hold, 3-way Conference, Call redirect, Call reject… • Erroneous flows

  14. Key Traffic Generation Measurements • Session success rates and GoS • SIP method count and response code • Registration history • Presence and IM message statistics • Incoming and outgoing RTP stream counters

  15. Real Life Examples

  16. Common pitfalls • Registration properties • Tendency to forget the credentials • Registration rates • Initially takes too long • Server will not withstand load • Non-standard flows • Test signaling & media simultaneously

  17. Analog call generator Call Analysis IP / ATM / FR Core 2 Core 1 UUT Call Analysis UUT SIP Stress Generator SIP Stress Generator Network Model: Simple Test Lab • Test Environment: • Multi-service solution • Multi-technology: VoIP & PSTN

  18. Network Model: Simple Test Lab (cont.) • SIP Stress Generator: • Generate different levels of stress including RTP • Voice and video simulation • Call Analysis: • Signaling and media analysis • Voice quality (intrusive, non-intrusive and subjective) • RTP transport streams • Analog Call Generator • Connect to PSTN interfaces • Measure voice quality, voice distortion

  19. Testing Options • Performance - under different levels of stress: • Signaling and media quality evaluation • Call handling • Media degradation • Interoperability • Different codec models • PSTN and VoIP devices • Reliability • Quality evaluation • Stability testing

  20. Firewall, SBC, CSCF Testing Call Analysis Call Analysis • Load scenarios • BHCA – 1,000,000s per hour • CPS – hundreds to thousands • Concurrent calls > 100,000s Test bed 1 Test bed 2 Soft-Switch Soft-Switch Public IP Session Boarder Controller Session Boarder Controller SIP Stress Generator SIP Stress Generator SIP Stress Generator SP1 SP2

  21. Firewall, SBC & CSCF: Test Lab • SIP Stress Generation requirements: • Different levels of stress • Different services • Different media • Different call flows • QoS analysis: • Voice quality • Transport

  22. Firewall, SBC & CSCF: Testing Needs • QoS • Delays, Jitter, Packet loss, MOS • Stability (network elements / services) • Benchmarking and comparisons

  23. Simultaneous test bed operation

  24. Elegant solution

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