diff --git a/tests/test_transport/test_validate/test_uattributesvalidator.py b/tests/test_transport/test_validate/test_uattributesvalidator.py
index 4ada52d..672e3a5 100644
--- a/tests/test_transport/test_validate/test_uattributesvalidator.py
+++ b/tests/test_transport/test_validate/test_uattributesvalidator.py
@@ -466,6 +466,39 @@ def test_validating_request_containing_token(self):
         status = validator.validate(attributes)
         self.assertEqual(ValidationResult.success(), status)
 
+    def test_valid_request_methoduri_in_sink(self):
+        sink = LongUriSerializer().deserialize("/test.service/1/rpc.method")
+        attributes = UAttributesBuilder.request(UPriority.UPRIORITY_CS0, sink, 3000).build()
+        validator = UAttributesValidator.get_validator(attributes)
+        self.assertEqual("UAttributesValidator.Request", str(validator))
+        status = validator.validate(attributes)
+        self.assertEqual(ValidationResult.success(), status)
+
+    def test_invalid_request_methoduri_in_sink(self):
+        sink = LongUriSerializer().deserialize("/test.client/1/test.response")
+        attributes = UAttributesBuilder.request(UPriority.UPRIORITY_CS0, sink, 3000).build()
+        validator = UAttributesValidator.get_validator(attributes)
+        self.assertEqual("UAttributesValidator.Request", str(validator))
+        status = validator.validate(attributes)
+        self.assertEqual("Invalid RPC method uri. Uri should be the method to be called, or method from response.", status.get_message())
+
+    def test_valid_response_uri_in_sink(self):
+        sink = LongUriSerializer().deserialize("/test.client/1/rpc.response")
+        attributes = UAttributesBuilder.response(UPriority.UPRIORITY_CS0, sink, Factories.UPROTOCOL.create()).build()
+        validator = UAttributesValidator.get_validator(attributes)
+        self.assertEqual("UAttributesValidator.Response", str(validator))
+        status = validator.validate(attributes)
+        self.assertEqual(ValidationResult.success(), status)
+
+    def test_invalid_response_uri_in_sink(self):
+        sink = LongUriSerializer().deserialize("/test.client/1/rpc.method")
+        attributes = UAttributesBuilder.response(UPriority.UPRIORITY_CS0, sink, Factories.UPROTOCOL.create()).build()
+        validator = UAttributesValidator.get_validator(attributes)
+        self.assertEqual("UAttributesValidator.Response", str(validator))
+        status = validator.validate(attributes)
+        self.assertEqual("Invalid RPC response type.", status.get_message())
+
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/uprotocol/transport/validate/uattributesvalidator.py b/uprotocol/transport/validate/uattributesvalidator.py
index 3017fb0..a92ffef 100644
--- a/uprotocol/transport/validate/uattributesvalidator.py
+++ b/uprotocol/transport/validate/uattributesvalidator.py
@@ -26,9 +26,8 @@
 
 
 from abc import abstractmethod
-from datetime import datetime
 from enum import Enum
-
+from uprotocol.proto.uri_pb2 import UUri
 from uprotocol.proto.uattributes_pb2 import UAttributes, UMessageType
 from uprotocol.proto.ustatus_pb2 import UCode
 from uprotocol.uri.validator.urivalidator import UriValidator
@@ -221,7 +220,7 @@ def validate_sink(self, attributes_value: UAttributes) -> ValidationResult:
         @param attributes_value:UAttributes object containing the sink to validate.
         @return:Returns a  ValidationResult that is success or failed with a failure message.
         """
-        return UriValidator.validate_rpc_response(
+        return UriValidator.validate_rpc_method(
             attributes_value.sink) if attributes_value.HasField('sink') else ValidationResult.failure("Missing Sink")
 
     def validate_ttl(self, attributes_value: UAttributes) -> ValidationResult:
@@ -263,11 +262,11 @@ def validate_sink(self, attributes_value: UAttributes) -> ValidationResult:
         @param attributes_value:UAttributes object containing the sink to validate.
         @return:Returns a  ValidationResult that is success or failed with a failure message.
         """
-        result = UriValidator.validate_rpc_method(attributes_value.sink)
-        if result.is_success():
-            return result
-        else:
+        if not attributes_value.HasField('sink') or attributes_value.sink == UUri():
             return ValidationResult.failure("Missing Sink")
+        result = UriValidator.validate_rpc_response(attributes_value.sink)
+        return result
+
 
     def validate_req_id(self, attributes_value: UAttributes) -> ValidationResult:
         """