ng, dynamic&gt; toJson() {
  final Map&lt;String, dynamic&gt; data = new Map&lt;String, dynamic&gt;();
  data[&quot;event&quot;] = this.event;
  data[&quot;caller&quot;] = this.caller;
  data[&quot;displayname&quot;] = this.displayname;
  data[&quot;callee&quot;] = this.callee;
  return data;
}</code></pre>
</section>


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