/usr/share/kamailio/xhttp_pi/purple-table is in kamailio-xml-modules 4.0.4-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10  | 	<!-- Declaration of purplemap table-->
	<db_table id="purplemap">
		<table_name>purplemap</table_name>
		<db_url_id>mysql</db_url_id>
		<column><field>id</field><type>DB1_INT</type></column>
		<column><field>sip_user</field><type>DB1_STR</type></column>
		<column><field>ext_user</field><type>DB1_STR</type></column>
		<column><field>ext_prot</field><type>DB1_STR</type></column>
		<column><field>ext_pass</field><type>DB1_STR</type></column>
	</db_table>
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