diff --git a/src/zeep/wsse/signature.py b/src/zeep/wsse/signature.py
index 47ab7fd4..3ff48929 100644
--- a/src/zeep/wsse/signature.py
+++ b/src/zeep/wsse/signature.py
@@ -53,6 +53,8 @@ def __init__(
         password=None,
         signature_method=None,
         digest_method=None,
+        verify_response_signature=True,
+        response_cert_data=None,
     ):
         check_xmlsec_import()
 
@@ -61,6 +63,8 @@ def __init__(
         self.password = password
         self.digest_method = digest_method
         self.signature_method = signature_method
+        self.verify_response_signature = verify_response_signature
+        self.response_cert_data = response_cert_data
 
     def apply(self, envelope, headers):
         key = _make_sign_key(self.key_data, self.cert_data, self.password)
@@ -70,7 +74,11 @@ def apply(self, envelope, headers):
         return envelope, headers
 
     def verify(self, envelope):
-        key = _make_verify_key(self.cert_data)
+        if not self.verify_response_signature:
+            return envelope
+
+        cert_data = self.response_cert_data if self.response_cert_data else self.cert_data
+        key = _make_verify_key(cert_data)
         _verify_envelope_with_key(envelope, key)
         return envelope
 
@@ -85,6 +93,8 @@ def __init__(
         password=None,
         signature_method=None,
         digest_method=None,
+        verify_response_signature=True,
+        response_certfile=None,
     ):
         super().__init__(
             _read_file(key_file),
@@ -92,6 +102,8 @@ def __init__(
             password,
             signature_method,
             digest_method,
+            verify_response_signature,
+            _read_file(response_certfile) if response_certfile else None
         )
 
 
diff --git a/src/zeep/xsd/types/complex.py b/src/zeep/xsd/types/complex.py
index 4c69a9cd..65c39b95 100644
--- a/src/zeep/xsd/types/complex.py
+++ b/src/zeep/xsd/types/complex.py
@@ -447,6 +447,8 @@ def extend(self, base):
 
         elif self._element or base_element:
             element = self._element or base_element
+        elif isinstance(base, ComplexType):
+            element = None
         else:
             element = Element("_value_1", base)
 
diff --git a/tests/test_xsd_complex_types.py b/tests/test_xsd_complex_types.py
index 55430c91..6efb8945 100644
--- a/tests/test_xsd_complex_types.py
+++ b/tests/test_xsd_complex_types.py
@@ -422,3 +422,107 @@ def test_ignore_sequence_order():
 
     response = elm.parse(node[0], schema)
     assert response.Baz.id == 3
+
+
+def test_extension_with_attributes_preserves_values():
+    schema = xsd.Schema(
+        load_xml(
+            """
+        <?xml version="1.0"?>
+        <schema xmlns="http://www.w3.org/2001/XMLSchema"
+                xmlns:tns="http://tests.python-zeep.org/"
+                targetNamespace="http://tests.python-zeep.org/"
+                elementFormDefault="unqualified"
+                attributeFormDefault="unqualified">
+          <complexType name="BaseType">
+            <attribute name="attr1" type="integer" use="required"/>
+            <attribute name="attr2" type="string" use="required"/>
+          </complexType>
+          <complexType name="ExtendedType">
+            <complexContent>
+              <extension base="tns:BaseType"/>
+            </complexContent>
+          </complexType>
+          <element name="item" type="tns:ExtendedType"/>
+        </schema>
+    """
+        )
+    )
+    schema.set_ns_prefix("tns", "http://tests.python-zeep.org/")
+
+    item_elm = schema.get_element("tns:item")
+    obj = item_elm(attr1=10, attr2="test")
+
+    assert obj.attr1 == 10
+    assert obj.attr2 == "test"
+
+    result = render_node(item_elm, obj)
+    expected = """
+      <document>
+        <ns0:item xmlns:ns0="http://tests.python-zeep.org/" attr1="10" attr2="test"/>
+      </document>
+    """
+    assert_nodes_equal(result, expected)
+
+    parsed = item_elm.parse(result[0], schema)
+    assert parsed.attr1 == 10
+    assert parsed.attr2 == "test"
+
+
+def test_extension_with_attributes_and_elements():
+    schema = xsd.Schema(
+        load_xml(
+            """
+        <?xml version="1.0"?>
+        <schema xmlns="http://www.w3.org/2001/XMLSchema"
+                xmlns:tns="http://tests.python-zeep.org/"
+                targetNamespace="http://tests.python-zeep.org/"
+                elementFormDefault="unqualified"
+                attributeFormDefault="unqualified">
+          <complexType name="BaseType">
+            <attribute name="attr1" type="integer" use="required"/>
+            <attribute name="attr2" type="string" use="required"/>
+          </complexType>
+          <complexType name="ContainerBaseType" abstract="true">
+            <sequence>
+              <element name="item" type="tns:ExtendedType"/>
+            </sequence>
+          </complexType>
+          <complexType name="ExtendedType">
+            <complexContent>
+              <extension base="tns:BaseType"/>
+            </complexContent>
+          </complexType>
+          <complexType name="ContainerType">
+            <complexContent>
+              <extension base="tns:ContainerBaseType"/>
+            </complexContent>
+          </complexType>
+          <element name="container" type="tns:ContainerType"/>
+        </schema>
+    """
+        )
+    )
+    schema.set_ns_prefix("tns", "http://tests.python-zeep.org/")
+
+    container_elm = schema.get_element("tns:container")
+    extended_type = schema.get_type("tns:ExtendedType")
+
+    obj = container_elm(item=extended_type(attr1=10, attr2="test"))
+
+    assert obj.item.attr1 == 10
+    assert obj.item.attr2 == "test"
+
+    result = render_node(container_elm, obj)
+    expected = """
+      <document>
+        <ns0:container xmlns:ns0="http://tests.python-zeep.org/">
+          <item attr1="10" attr2="test"/>
+        </ns0:container>
+      </document>
+    """
+    assert_nodes_equal(result, expected)
+
+    parsed = container_elm.parse(result[0], schema)
+    assert parsed.item.attr1 == 10
+    assert parsed.item.attr2 == "test"