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    Building Telephony Systems with OpenSIPS - Second Edition: Build high-speed and highly scalable telephony systems using OpenSIPS (English Edition)
    New €57.30
    You save €23.11 (40%)
    book€34.19
    You save €23.11 (40%)
    New €57.30€34.19

    Building Telephony Systems with OpenSIPS 1.6
    book€1.73
    €1.73

    Building Telephony Systems with OpenSER: A step-by-step guide to building a high performance Telephony System
    New €54.90
    You save €53.17 (96%)
    book€1.73
    You save €53.17 (96%)
    New €54.90€1.73

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