Plugging log4net framework

App.config

<?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="sipua" type="pjsip4net.Configuration.SipUserAgentSettingsSection, pjsip4net, Culture=neutral, PublicKeyToken=null"/>
    <sectionGroup name="common">
      <section name="logging" type="Common.Logging.ConfigurationSectionHandler, Common.Logging" />
    </sectionGroup>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=1b44e1d426115821"/>
  </configSections>
  <sipua>
  </sipua>
  <common>
    <logging>
      <factoryAdapter type="Common.Logging.Log4Net.Log4NetLoggerFactoryAdapter, Common.Logging.Log4Net">
        <arg key="configType" value="EXTERNAL" />
      </factoryAdapter>  
    </logging>
  </common>
  <log4net>
    <appender name="ColoredConsoleAppender" type="log4net.Appender.ColoredConsoleAppender">
      <mapping>
        <level value="ERROR"/>
        <foreColor value="White"/>
        <backColor value="Red, HighIntensity"/>
      </mapping>
      <mapping>
        <level value="INFO"/>
        <backColor value="Green"/>
      </mapping>
      <mapping>
        <level value="WARN"/>
        <backColor value="Yellow"/>
      </mapping>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level - %message%newline"/>
      </layout>
    </appender>
    <appender name="FileAppender" type="log4net.Appender.FileAppender">
      <file value="siptrace.txt"/>
      <appendToFile value="true"/>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level - %message%newline"/>
      </layout>
    </appender>

    <root>
      <level value="DEBUG"/>
      <appender-ref ref="ColoredConsoleAppender"/>
      <appender-ref ref="FileAppender"/>
    </root>
  </log4net>

Program.cs

XmlConfigurator.Configure();
_logger = LogManager.GetLogger("root");//logging is purely an application facility, you can choose whatever you want to log with
var cfg = Configure.Pjsip4Net().Build().Start();