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SIP Peering KPI's -How to Measure Answer Seize Ratio [ASR] and other Key Performance Indicators in a VoIP World | Khalid Mohyi - Academia.edu
ITU-T Rec. E.419 (02/2006) Business oriented key performance indicators for management of networks and services
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P-GW Administration Guide, StarOS Release 21.20 - PDN Gateway Overview [Cisco ASR 5000 Series] - Cisco
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