connector-telephony/event_phone/event_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  © 2014-2016 Akretion (Alexis de Lattre <alexis.delattre@akretion.com>)
  License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl)
-->

<odoo>
<data>


<record id="view_event_registration_form" model="ir.ui.view">
    <field name="name">event_phone.event_registration.form</field>
    <field name="model">event.registration</field>
    <field name="inherit_id" ref="event.view_event_registration_form"/>
    <field name="arch" type="xml">
        <field name="phone" position="attributes">
            <attribute name="widget">phone</attribute>
        </field>
    </field>
</record>


</data>
</odoo>