connector-telephony/asterisk_click2dial_crm_claim/crm_claim_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  Asterisk Click2dial CRM Claim module for OpenERP
  Copyright (C) 2013 Invitu <contact@invitu.com>
  The licence is in the file __openerp__.py

  Inherit crm_claim view to add 'Dial' button next to 'phone'
  field
-->

<openerp>
<data>

<record id="asterisk_crm_claim_form_dial" model="ir.ui.view">
    <field name="name">asterisk.crm_claim.form.dial</field>
    <field name="model">crm.claim</field>
    <field name="inherit_id" ref="crm_claim.crm_case_claims_form_view"/>
    <field name="arch" type="xml">
        <field name="partner_phone" position="replace">
            <group colspan="2" col="3">
                <field name="partner_phone" colspan="2" />
                <button name="action_dial" context="{'field2dial': 'partner_phone'}" string="Dial" type="object" attrs="{'invisible':[('partner_phone','=',False)]}"/>
            </group>
        </field>
    </field>
</record>

</data>
</openerp>