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<profile name="megafon">
  <gateways>
    <X-PRE-PROCESS cmd="include" data="megafon/*.xml"/>
  </gateways>
  <aliases>
  </aliases>
  <domains>
    <domain name="all" alias="false" parse="true"/>
  </domains>
  <settings>
    <param name="debug" value="0"/>
    <param name="sip-trace" value="no"/>
    <param name="sip-capture" value="no"/>
    <param name="rfc2833-pt" value="101"/>
    <param name="sip-port" value="$${megafon_sip_port}"/>
    <param name="dialplan" value="XML"/>
    <param name="context" value="megafon"/>
    <param name="dtmf-duration" value="2000"/>
    <param name="inbound-codec-prefs" value="$${global_codec_prefs}"/>
    <param name="outbound-codec-prefs" value="$${outbound_codec_prefs}"/>
    <param name="hold-music" value="$${hold_music}"/>
    <param name="enable-timer" value="true"/>
    <param name="rtp-timer-name" value="soft"/>
    <param name="enable-100rel" value="false"/>
    <param name="local-network-acl" value="mega"/>
    <param name="suppress-cng" value="true"/>
    <param name="manage-presence" value="false"/>
    <param name="user-agent-string" value="SBC"/>
    <param name="username" value="SBC" />
    <param name="rtp-rewrite-timestamps" value="true"/>
    <param name="rtcp-audio-interval-msec" value="5000"/>
    <param name="rtcp-video-interval-msec" value="5000"/>
    <param name="inbound-codec-negotiation" value="generous"/>
    <param name="nonce-ttl" value="60"/>
    <param name="auth-calls" value="false"/>
    <param name="inbound-late-negotiation" value="true"/>
    <param name="inbound-zrtp-passthru" value="false"/>
    <param name="rtp-ip" value="$${megafon_ip_v4}"/>
    <param name="sip-ip" value="$${megafon_ip_v4}"/>
    <param name="rtp-timeout-sec" value="300"/>
    <param name="rtp-hold-timeout-sec" value="1800"/>
    <param name="send-display-update" value="false"/>
  </settings>
</profile>

[root@SBC megafon]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
[root@SBC megafon]#