Examples

Here are some example helpers:

ftp

<?xml version="1.0" encoding="utf-8"?>
<helper module="nf_conntrack_ftp">
  <port protocol="tcp" port="21"/>
</helper>

pptp

<?xml version="1.0" encoding="utf-8"?>
<helper module="nf_conntrack_pptp" family="ipv4">
  <port protocol="tcp" port="1723"/>
</helper>

Q.931

<?xml version="1.0" encoding="utf-8"?>
<helper module="nf_conntrack_h323">
  <port protocol="tcp" port="1720"/>
</helper>

sip

<?xml version="1.0" encoding="utf-8"?>
<helper module="nf_conntrack_sip">
  <port protocol="tcp" port="5060"/>
  <port protocol="udp" port="5060"/>
</helper>