SIP-Based Voice Measurement Infrastructure Cesar Marcondes UCLA.

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Presentation transcript:

SIP-Based Voice Measurement Infrastructure Cesar Marcondes UCLA

Motivation Voice Measurements Predict Voice Quality Gateway Provisioning Assessment of Priority Voice over IP Calls in SIP.edu Debugging Misconfigured sites

Background/Issues We worked during the year 2003 in a similar idea in Brazilian Academic Network (RNP2) Quality of voice can be determined through quantitative metrics mapping to Mean Opinion Score MOS: Poor, Regular, Good, Excellent And objectively calculated through E-Model (ITU-T G.107 and ETSI ETR 250) We can approach in two ways: Active Quality Monitoring Passive Quality Monitoring

Voice Measurement Models Active monitoring - using remote answering machines (client/server model), generate call, not real ones, but "emulated". Assess network impairments. Passive monitoring of real calls - capture statistics from real calls, use sniffer near the "gateway" to detect VoIP flows and obtain the call leg RTP/RTCP

Research Ideas VoIP Scalable Measurement Infrastructure Propose an automatic and robust architecture, implementation, support from SIP.edu (remote sites for active measurement), best practice cookbook (?) Other research interests: Assessment of VoIP calls over Wireless Hotspots in SIP- enabled campus Design, Implementation and Assessment of TCP-rate based protocol (focus on VoIP as the payload) – the idea is obtain some “level of QoS” through dynamic changes in the cwind grow/decrease rate

Related Projects H.323 Beacon (there could be necessary to implement a SIP version of this tool) Brazilian Academic Network (RNP) tools (basically they have an E-Model Implementation) Cisco/other vendors VoIP quality measurements tools in-built Cisco Works2000 VoiceManager