crm_tree_date_search/llamadas.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="1">

        <record id="crm.crm_case_categ_phone_incoming0" model="ir.actions.act_window">
            <field name="res_model">crm.phonecall</field>
            <field name="context">{'dates_filter' : ['create_date']}</field>
        </record>

    </data>
</openerp>