kamailio/modules_s/avp/doc/params.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" 
   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

<section id="avp.parameters" xmlns:xi="http://www.w3.org/2001/XInclude">
    <sectioninfo>
    </sectioninfo>

    <title>Parameters</title>

    <section id="xlbuf_size">
    <title><varname>xlbuf_size</varname> (integer)</title>
    <para>
		Defines size of internal buffer for all xlog formatting calls. If you
don't use xlog formatting calls, you can set it to 0 to preserve some memory, if
you get errors while formatting due to buffer size, you can enlarge it.
	</para>
    <para>
        Default value is 256.
    </para>
    <example>
        <title>Set <varname>xlbuf_size</varname> parameter</title>
        <programlisting>
...
modparam("avp", "xlbuf_size", 1024)
...
        </programlisting>
    </example>
    </section>

</section>