diff --git a/addons/account_edi_ubl_cii/models/account_edi_xml_ubl_20.py b/addons/account_edi_ubl_cii/models/account_edi_xml_ubl_20.py
index 5c0dcaf870c..008f4a54356 100644
--- a/addons/account_edi_ubl_cii/models/account_edi_xml_ubl_20.py
+++ b/addons/account_edi_ubl_cii/models/account_edi_xml_ubl_20.py
@@ -66,10 +66,11 @@ class AccountEdiXmlUBL20(models.AbstractModel):
         }]
 
     def _get_partner_contact_vals(self, partner):
+        phone = partner.phone or partner.mobile
         return {
             'id': partner.id,
             'name': partner.name,
-            'telephone': partner.phone or partner.mobile,
+            'telephone': phone and phone.strip(),
             'electronic_mail': partner.email,
         }