SIP in Service Quality Monitoring

Service Quality Monitoring – The Bigger Picture

Packet delay

Packet delay variation

Packet loss ratio

Packet error rate

Session Success /Failure Metrics Session timers Metrics Session Timers Metrics Session Efficiency Metrics MOS CCI E-Model PESQ SIP QoS Mechanism QoS Monitoring QoS Benchmarking QoS Service Level Agreement

SIP Monitoring: Holistic Approach to SQM

Understand customers’ experience

Performance and quality indicators for evaluating different segments of service usage

Be proactive with actionable metrics

Identify quality impairments before customers have noticed

SLA Monitoring

Comparable metrics for internal and Partner SLA monitoring

Do my sessions meet quality expectations? How long does it take to connect? Why does my session keep dropping? How fast is my service restored? What performance level is my session operating at?

Analyzing the Performance of a SIP Session ! “ SIP timers should at least match (if not surpass) familiar traditional telephony timers “ INVITE : sip:ttib@ttil.com Calls: ttib@ttil.com INVITE : sip:ttib@18.18.2.4 100 - Trying 180 - Ringing Rings 180 - Ringing 200 - OK Answers 200 - OK ACK BYE Hangs up 200 - OK User A User B Proxy Talking Talking RTP 200 - OK REGISTER : sip:ttia@ttil.com 401 - Unauthorized REGISTER : (add credentials) Registration Request Delay (RRD) Session Request Delay (SRD) Session Disconnect Delay (SDD) Session Duration Time (SDT) Session Establishment Rate (SER)

SIP Monitoring Life Cycle Session Processing Metric Dimensioning & Creation Service Degradation Rules Customers Customer groups Services Service levels Domains Partners Equipment type Root-Cause Isolation

SIP Performance Indicators Session initiation

Registration Request Delay (RRD)

Session Request Delay (SRD)

Post-Dial Delay (PDD)

Average hops/ INVITE (AHI)

Session Termination

Session Disconnect Delay (SDD)

Session Disconnect Failure (SDF)

Cut-off Calls

Session Establishment Rate (SER)

Answer Seizure Rate (ASR)

Network Efficiency Rate (NER)

Session Establishment Efficiency Rate (SEER)

Session Progress

Session Duration Time (SDT)

Call Hold-Time (CHT)

Ineffective Session Attempts (ISA)

Session Defects/ million (SPM)

Session Completion Rare (SCR)

Session Success Rate (SSR)

Call Completion Rate

Call Success Rate (CSR)

Performance indicators provided for VoIP telephone calls, multimedia distribution, and multimedia conferences

End-to-End SIP Performance Summary

Evaluate customers’ experience

Be proactive with actionable metrics

Manage customers’ and inter-connectivity SLAs

Four phases of SIP monitoring life cycle:

Session Processing

Metric dimensioning & creation

Service degradation rules

Root-cause isolation

The Challenge Monitoring Approach Solution Benefits Implementing end-to-end Service Quality Monitoring in SIP-based networks

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