connector-telephony/base_sms_client/views/server_action_view.xml

<?xml version="1.0"?>
<odoo>
    <record model="ir.ui.view" id="view_server_statistics_graph">
        <field name="model">ir.actions.server</field>
        <field name="inherit_id" ref="base.view_server_action_form"/>
        <field name="arch" type="xml">
            <page name="code" position="after" autofocus="autofocus">
                <page string="SMS" name="sms" attrs="{'invisible': [('state', '!=', 'sms')]}">
                    <group>
                        <field name="sms"/>
                        <field name="mobile"/>
                        <field name="sms_server_id" invisible="1"/>
                        <field name="sms_template_id" domain="[('sms_template','=',True)]" attrs="{'required':[('state','=','sms')]}"/>
                    </group>
                </page>
            </page>
        </field>
    </record>
</odoo>