<li><a href="http://search.cpan.org/dist/Frontier-RPC">Frontier::RPC (Frontier::RPC2)</a>
<li><a href="http://search.cpan.org/search?mode=module&query=MIME::Entity">MIME::Entity (MIME-tools)</a>
<!-- <li><a href="http://search.cpan.org/dist/Crypt-YAPassGen">Crypt::YAPassGen</a> -->
+ <li><a href="http://search.cpan.org/search?mode=module&query=MIME::Entity">Fax::Hylafax::Client</a> <i>(Required if using FAX invoice destinations</i>
<li><a href="http://search.cpan.org/dist/ApacheDBI">Apache::DBI</a> <i>(optional but recommended for better webinterface performance)</i>
</ul>
</ul>