diff --git a/app/helpers/filter_helper.rb b/app/helpers/filters/filter_helper.rb
similarity index 90%
rename from app/helpers/filter_helper.rb
rename to app/helpers/filters/filter_helper.rb
index 9b5cac684..fe03dae28 100644
--- a/app/helpers/filter_helper.rb
+++ b/app/helpers/filters/filter_helper.rb
@@ -1,4 +1,4 @@
-module FilterHelper
+module Filters::FilterHelper
   def build_condition_query(model_filters, query_hash, current_index)
     current_filter = model_filters[query_hash['attribute_key']]
 
@@ -89,4 +89,18 @@ module FilterHelper
     operator = condition['query_operator'].upcase
     raise CustomExceptions::CustomFilter::InvalidQueryOperator.new({}) unless %w[AND OR].include?(operator)
   end
+
+  def conversation_status_values(values)
+    return Conversation.statuses.values if values.include?('all')
+
+    values.map { |x| Conversation.statuses[x.to_sym] }
+  end
+
+  def conversation_priority_values(values)
+    values.map { |x| Conversation.priorities[x.to_sym] }
+  end
+
+  def message_type_values(values)
+    values.map { |x| Message.message_types[x.to_sym] }
+  end
 end
diff --git a/app/javascript/dashboard/components-next/filter/contactProvider.js b/app/javascript/dashboard/components-next/filter/contactProvider.js
index 4aceac359..4b2709e62 100644
--- a/app/javascript/dashboard/components-next/filter/contactProvider.js
+++ b/app/javascript/dashboard/components-next/filter/contactProvider.js
@@ -2,7 +2,10 @@ import { computed } from 'vue';
 import { useI18n } from 'vue-i18n';
 import { useOperators } from './operators';
 import { useMapGetter } from 'dashboard/composables/store.js';
-import { buildAttributesFilterTypes } from './helper/filterHelper.js';
+import {
+  buildAttributesFilterTypes,
+  CONTACT_ATTRIBUTES,
+} from './helper/filterHelper.js';
 import countries from 'shared/constants/countries.js';
 
 /**
@@ -59,7 +62,11 @@ export function useContactFilterContext() {
    * @type {import('vue').ComputedRef<FilterType[]>}
    */
   const customFilterTypes = computed(() =>
-    buildAttributesFilterTypes(contactAttributes.value, getOperatorTypes)
+    buildAttributesFilterTypes(
+      contactAttributes.value,
+      getOperatorTypes,
+      'contact'
+    )
   );
 
   /**
@@ -67,8 +74,8 @@ export function useContactFilterContext() {
    */
   const filterTypes = computed(() => [
     {
-      attributeKey: 'name',
-      value: 'name',
+      attributeKey: CONTACT_ATTRIBUTES.NAME,
+      value: CONTACT_ATTRIBUTES.NAME,
       attributeName: t('CONTACTS_LAYOUT.FILTER.NAME'),
       label: t('CONTACTS_LAYOUT.FILTER.NAME'),
       inputType: 'plainText',
@@ -77,8 +84,8 @@ export function useContactFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'email',
-      value: 'email',
+      attributeKey: CONTACT_ATTRIBUTES.EMAIL,
+      value: CONTACT_ATTRIBUTES.EMAIL,
       attributeName: t('CONTACTS_LAYOUT.FILTER.EMAIL'),
       label: t('CONTACTS_LAYOUT.FILTER.EMAIL'),
       inputType: 'plainText',
@@ -87,8 +94,8 @@ export function useContactFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'phone_number',
-      value: 'phone_number',
+      attributeKey: CONTACT_ATTRIBUTES.PHONE_NUMBER,
+      value: CONTACT_ATTRIBUTES.PHONE_NUMBER,
       attributeName: t('CONTACTS_LAYOUT.FILTER.PHONE_NUMBER'),
       label: t('CONTACTS_LAYOUT.FILTER.PHONE_NUMBER'),
       inputType: 'plainText',
@@ -97,8 +104,8 @@ export function useContactFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'identifier',
-      value: 'identifier',
+      attributeKey: CONTACT_ATTRIBUTES.IDENTIFIER,
+      value: CONTACT_ATTRIBUTES.IDENTIFIER,
       attributeName: t('CONTACTS_LAYOUT.FILTER.IDENTIFIER'),
       label: t('CONTACTS_LAYOUT.FILTER.IDENTIFIER'),
       inputType: 'plainText',
@@ -107,8 +114,8 @@ export function useContactFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'country_code',
-      value: 'country_code',
+      attributeKey: CONTACT_ATTRIBUTES.COUNTRY_CODE,
+      value: CONTACT_ATTRIBUTES.COUNTRY_CODE,
       attributeName: t('FILTER.ATTRIBUTES.COUNTRY_NAME'),
       label: t('FILTER.ATTRIBUTES.COUNTRY_NAME'),
       inputType: 'searchSelect',
@@ -118,8 +125,8 @@ export function useContactFilterContext() {
       attributeModel: 'additional',
     },
     {
-      attributeKey: 'city',
-      value: 'city',
+      attributeKey: CONTACT_ATTRIBUTES.CITY,
+      value: CONTACT_ATTRIBUTES.CITY,
       attributeName: t('CONTACTS_LAYOUT.FILTER.CITY'),
       label: t('CONTACTS_LAYOUT.FILTER.CITY'),
       inputType: 'plainText',
@@ -128,8 +135,8 @@ export function useContactFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'created_at',
-      value: 'created_at',
+      attributeKey: CONTACT_ATTRIBUTES.CREATED_AT,
+      value: CONTACT_ATTRIBUTES.CREATED_AT,
       attributeName: t('CONTACTS_LAYOUT.FILTER.CREATED_AT'),
       label: t('CONTACTS_LAYOUT.FILTER.CREATED_AT'),
       inputType: 'date',
@@ -138,8 +145,8 @@ export function useContactFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'last_activity_at',
-      value: 'last_activity_at',
+      attributeKey: CONTACT_ATTRIBUTES.LAST_ACTIVITY_AT,
+      value: CONTACT_ATTRIBUTES.LAST_ACTIVITY_AT,
       attributeName: t('CONTACTS_LAYOUT.FILTER.LAST_ACTIVITY'),
       label: t('CONTACTS_LAYOUT.FILTER.LAST_ACTIVITY'),
       inputType: 'date',
@@ -148,8 +155,8 @@ export function useContactFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'referer',
-      value: 'referer',
+      attributeKey: CONTACT_ATTRIBUTES.REFERER,
+      value: CONTACT_ATTRIBUTES.REFERER,
       attributeName: t('CONTACTS_LAYOUT.FILTER.REFERER_LINK'),
       label: t('CONTACTS_LAYOUT.FILTER.REFERER_LINK'),
       inputType: 'plainText',
@@ -158,8 +165,8 @@ export function useContactFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'blocked',
-      value: 'blocked',
+      attributeKey: CONTACT_ATTRIBUTES.BLOCKED,
+      value: CONTACT_ATTRIBUTES.BLOCKED,
       attributeName: t('CONTACTS_LAYOUT.FILTER.BLOCKED'),
       label: t('CONTACTS_LAYOUT.FILTER.BLOCKED'),
       inputType: 'searchSelect',
diff --git a/app/javascript/dashboard/components-next/filter/helper/filterHelper.js b/app/javascript/dashboard/components-next/filter/helper/filterHelper.js
index 2160365f6..cb5acfe40 100644
--- a/app/javascript/dashboard/components-next/filter/helper/filterHelper.js
+++ b/app/javascript/dashboard/components-next/filter/helper/filterHelper.js
@@ -1,3 +1,35 @@
+/**
+ * Standard attributes of the conversation model
+ */
+export const CONVERSATION_ATTRIBUTES = {
+  STATUS: 'status',
+  PRIORITY: 'priority',
+  ASSIGNEE_ID: 'assignee_id',
+  INBOX_ID: 'inbox_id',
+  TEAM_ID: 'team_id',
+  DISPLAY_ID: 'display_id',
+  CAMPAIGN_ID: 'campaign_id',
+  LABELS: 'labels',
+  BROWSER_LANGUAGE: 'browser_language',
+  COUNTRY_CODE: 'country_code',
+  REFERER: 'referer',
+  CREATED_AT: 'created_at',
+  LAST_ACTIVITY_AT: 'last_activity_at',
+};
+
+export const CONTACT_ATTRIBUTES = {
+  NAME: 'name',
+  EMAIL: 'email',
+  PHONE_NUMBER: 'phone_number',
+  IDENTIFIER: 'identifier',
+  COUNTRY_CODE: 'country_code',
+  CITY: 'city',
+  CREATED_AT: 'created_at',
+  LAST_ACTIVITY_AT: 'last_activity_at',
+  REFERER: 'referer',
+  BLOCKED: 'blocked',
+};
+
 /**
  * Determines the input type for a custom attribute based on its key
  * @param {string} key - The attribute display type key
@@ -20,24 +52,37 @@ export const getCustomAttributeInputType = key => {
 
 /**
  * Builds filter types for custom attributes
+ * This also removes any conflicting attributes
  * @param {Array} attributes - The attributes array
  * @param {Function} getOperatorTypes - Function to get operator types
  * @returns {Array} Array of filter types
  */
-export const buildAttributesFilterTypes = (attributes, getOperatorTypes) => {
-  return attributes.map(attr => ({
-    attributeKey: attr.attributeKey,
-    value: attr.attributeKey,
-    attributeName: attr.attributeDisplayName,
-    label: attr.attributeDisplayName,
-    inputType: getCustomAttributeInputType(attr.attributeDisplayType),
-    filterOperators: getOperatorTypes(attr.attributeDisplayType),
-    options:
-      attr.attributeDisplayType === 'list'
-        ? attr.attributeValues.map(item => ({ id: item, name: item }))
-        : [],
-    attributeModel: 'customAttributes',
-  }));
+export const buildAttributesFilterTypes = (
+  attributes,
+  getOperatorTypes,
+  filterModel = 'conversation'
+) => {
+  const standardAttributes = Object.values(
+    filterModel === 'conversation'
+      ? CONVERSATION_ATTRIBUTES
+      : CONTACT_ATTRIBUTES
+  );
+
+  return attributes
+    .filter(attr => !standardAttributes.includes(attr.attributeKey))
+    .map(attr => ({
+      attributeKey: attr.attributeKey,
+      value: attr.attributeKey,
+      attributeName: attr.attributeDisplayName,
+      label: attr.attributeDisplayName,
+      inputType: getCustomAttributeInputType(attr.attributeDisplayType),
+      filterOperators: getOperatorTypes(attr.attributeDisplayType),
+      options:
+        attr.attributeDisplayType === 'list'
+          ? attr.attributeValues.map(item => ({ id: item, name: item }))
+          : [],
+      attributeModel: 'customAttributes',
+    }));
 };
 
 /**
diff --git a/app/javascript/dashboard/components-next/filter/provider.js b/app/javascript/dashboard/components-next/filter/provider.js
index bb775a663..f6d078d76 100644
--- a/app/javascript/dashboard/components-next/filter/provider.js
+++ b/app/javascript/dashboard/components-next/filter/provider.js
@@ -3,7 +3,10 @@ import { useI18n } from 'vue-i18n';
 import { useOperators } from './operators';
 import { useMapGetter } from 'dashboard/composables/store.js';
 import { useChannelIcon } from 'next/icon/provider';
-import { buildAttributesFilterTypes } from './helper/filterHelper';
+import {
+  buildAttributesFilterTypes,
+  CONVERSATION_ATTRIBUTES,
+} from './helper/filterHelper';
 import countries from 'shared/constants/countries.js';
 import languages from 'dashboard/components/widgets/conversation/advancedFilterItems/languages.js';
 
@@ -70,7 +73,11 @@ export function useConversationFilterContext() {
    * @type {import('vue').ComputedRef<FilterType[]>}
    */
   const customFilterTypes = computed(() =>
-    buildAttributesFilterTypes(conversationAttributes.value, getOperatorTypes)
+    buildAttributesFilterTypes(
+      conversationAttributes.value,
+      getOperatorTypes,
+      'conversation'
+    )
   );
 
   /**
@@ -78,8 +85,8 @@ export function useConversationFilterContext() {
    */
   const filterTypes = computed(() => [
     {
-      attributeKey: 'status',
-      value: 'status',
+      attributeKey: CONVERSATION_ATTRIBUTES.STATUS,
+      value: CONVERSATION_ATTRIBUTES.STATUS,
       attributeName: t('FILTER.ATTRIBUTES.STATUS'),
       label: t('FILTER.ATTRIBUTES.STATUS'),
       inputType: 'multiSelect',
@@ -94,8 +101,24 @@ export function useConversationFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'assignee_id',
-      value: 'assignee_id',
+      attributeKey: CONVERSATION_ATTRIBUTES.PRIORITY,
+      value: CONVERSATION_ATTRIBUTES.PRIORITY,
+      attributeName: t('FILTER.ATTRIBUTES.PRIORITY'),
+      label: t('FILTER.ATTRIBUTES.PRIORITY'),
+      inputType: 'multiSelect',
+      options: ['low', 'medium', 'high', 'urgent'].map(id => {
+        return {
+          id,
+          name: t(`CONVERSATION.PRIORITY.OPTIONS.${id.toUpperCase()}`),
+        };
+      }),
+      dataType: 'text',
+      filterOperators: equalityOperators.value,
+      attributeModel: 'standard',
+    },
+    {
+      attributeKey: CONVERSATION_ATTRIBUTES.ASSIGNEE_ID,
+      value: CONVERSATION_ATTRIBUTES.ASSIGNEE_ID,
       attributeName: t('FILTER.ATTRIBUTES.ASSIGNEE_NAME'),
       label: t('FILTER.ATTRIBUTES.ASSIGNEE_NAME'),
       inputType: 'searchSelect',
@@ -110,8 +133,8 @@ export function useConversationFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'inbox_id',
-      value: 'inbox_id',
+      attributeKey: CONVERSATION_ATTRIBUTES.INBOX_ID,
+      value: CONVERSATION_ATTRIBUTES.INBOX_ID,
       attributeName: t('FILTER.ATTRIBUTES.INBOX_NAME'),
       label: t('FILTER.ATTRIBUTES.INBOX_NAME'),
       inputType: 'searchSelect',
@@ -126,8 +149,8 @@ export function useConversationFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'team_id',
-      value: 'team_id',
+      attributeKey: CONVERSATION_ATTRIBUTES.TEAM_ID,
+      value: CONVERSATION_ATTRIBUTES.TEAM_ID,
       attributeName: t('FILTER.ATTRIBUTES.TEAM_NAME'),
       label: t('FILTER.ATTRIBUTES.TEAM_NAME'),
       inputType: 'searchSelect',
@@ -137,8 +160,8 @@ export function useConversationFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'display_id',
-      value: 'display_id',
+      attributeKey: CONVERSATION_ATTRIBUTES.DISPLAY_ID,
+      value: CONVERSATION_ATTRIBUTES.DISPLAY_ID,
       attributeName: t('FILTER.ATTRIBUTES.CONVERSATION_IDENTIFIER'),
       label: t('FILTER.ATTRIBUTES.CONVERSATION_IDENTIFIER'),
       inputType: 'plainText',
@@ -147,8 +170,8 @@ export function useConversationFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'campaign_id',
-      value: 'campaign_id',
+      attributeKey: CONVERSATION_ATTRIBUTES.CAMPAIGN_ID,
+      value: CONVERSATION_ATTRIBUTES.CAMPAIGN_ID,
       attributeName: t('FILTER.ATTRIBUTES.CAMPAIGN_NAME'),
       label: t('FILTER.ATTRIBUTES.CAMPAIGN_NAME'),
       inputType: 'searchSelect',
@@ -161,8 +184,8 @@ export function useConversationFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'labels',
-      value: 'labels',
+      attributeKey: CONVERSATION_ATTRIBUTES.LABELS,
+      value: CONVERSATION_ATTRIBUTES.LABELS,
       attributeName: t('FILTER.ATTRIBUTES.LABELS'),
       label: t('FILTER.ATTRIBUTES.LABELS'),
       inputType: 'multiSelect',
@@ -185,8 +208,8 @@ export function useConversationFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'browser_language',
-      value: 'browser_language',
+      attributeKey: CONVERSATION_ATTRIBUTES.BROWSER_LANGUAGE,
+      value: CONVERSATION_ATTRIBUTES.BROWSER_LANGUAGE,
       attributeName: t('FILTER.ATTRIBUTES.BROWSER_LANGUAGE'),
       label: t('FILTER.ATTRIBUTES.BROWSER_LANGUAGE'),
       inputType: 'searchSelect',
@@ -196,8 +219,8 @@ export function useConversationFilterContext() {
       attributeModel: 'additional',
     },
     {
-      attributeKey: 'country_code',
-      value: 'country_code',
+      attributeKey: CONVERSATION_ATTRIBUTES.COUNTRY_CODE,
+      value: CONVERSATION_ATTRIBUTES.COUNTRY_CODE,
       attributeName: t('FILTER.ATTRIBUTES.COUNTRY_NAME'),
       label: t('FILTER.ATTRIBUTES.COUNTRY_NAME'),
       inputType: 'searchSelect',
@@ -207,8 +230,8 @@ export function useConversationFilterContext() {
       attributeModel: 'additional',
     },
     {
-      attributeKey: 'referer',
-      value: 'referer',
+      attributeKey: CONVERSATION_ATTRIBUTES.REFERER,
+      value: CONVERSATION_ATTRIBUTES.REFERER,
       attributeName: t('FILTER.ATTRIBUTES.REFERER_LINK'),
       label: t('FILTER.ATTRIBUTES.REFERER_LINK'),
       inputType: 'plainText',
@@ -217,8 +240,8 @@ export function useConversationFilterContext() {
       attributeModel: 'additional',
     },
     {
-      attributeKey: 'created_at',
-      value: 'created_at',
+      attributeKey: CONVERSATION_ATTRIBUTES.CREATED_AT,
+      value: CONVERSATION_ATTRIBUTES.CREATED_AT,
       attributeName: t('FILTER.ATTRIBUTES.CREATED_AT'),
       label: t('FILTER.ATTRIBUTES.CREATED_AT'),
       inputType: 'date',
@@ -227,8 +250,8 @@ export function useConversationFilterContext() {
       attributeModel: 'standard',
     },
     {
-      attributeKey: 'last_activity_at',
-      value: 'last_activity_at',
+      attributeKey: CONVERSATION_ATTRIBUTES.LAST_ACTIVITY_AT,
+      value: CONVERSATION_ATTRIBUTES.LAST_ACTIVITY_AT,
       attributeName: t('FILTER.ATTRIBUTES.LAST_ACTIVITY'),
       label: t('FILTER.ATTRIBUTES.LAST_ACTIVITY'),
       inputType: 'date',
diff --git a/app/models/custom_attribute_definition.rb b/app/models/custom_attribute_definition.rb
index 7d7b36e42..09d415401 100644
--- a/app/models/custom_attribute_definition.rb
+++ b/app/models/custom_attribute_definition.rb
@@ -22,6 +22,12 @@
 #  index_custom_attribute_definitions_on_account_id  (account_id)
 #
 class CustomAttributeDefinition < ApplicationRecord
+  STANDARD_ATTRIBUTES = {
+    :conversation => %w[status priority assignee_id inbox_id team_id display_id campaign_id labels browser_language country_code referer created_at
+                        last_activity_at],
+    :contact => %w[name email phone_number identifier country_code city created_at last_activity_at referer blocked]
+  }.freeze
+
   scope :with_attribute_model, ->(attribute_model) { attribute_model.presence && where(attribute_model: attribute_model) }
   validates :attribute_display_name, presence: true
 
@@ -31,6 +37,7 @@ class CustomAttributeDefinition < ApplicationRecord
 
   validates :attribute_display_type, presence: true
   validates :attribute_model, presence: true
+  validate :attribute_must_not_conflict, on: :create
 
   enum attribute_model: { conversation_attribute: 0, contact_attribute: 1 }
   enum attribute_display_type: { text: 0, number: 1, currency: 2, percent: 3, link: 4, date: 5, list: 6, checkbox: 7 }
@@ -48,4 +55,11 @@ class CustomAttributeDefinition < ApplicationRecord
   def update_widget_pre_chat_custom_fields
     ::Inboxes::UpdateWidgetPreChatCustomFieldsJob.perform_later(account, self)
   end
+
+  def attribute_must_not_conflict
+    model_keys = attribute_model.to_sym == :conversation_attribute ? :conversation : :contact
+    return unless attribute_key.in?(STANDARD_ATTRIBUTES[model_keys])
+
+    errors.add(:attribute_key, I18n.t('errors.custom_attribute_definition.key_conflict'))
+  end
 end
diff --git a/app/services/filter_service.rb b/app/services/filter_service.rb
index 23cc0e188..e4cef7941 100644
--- a/app/services/filter_service.rb
+++ b/app/services/filter_service.rb
@@ -1,7 +1,7 @@
 require 'json'
 
 class FilterService
-  include FilterHelper
+  include Filters::FilterHelper
   include CustomExceptions::CustomFilter
 
   ATTRIBUTE_MODEL = 'conversation_attribute'.freeze
@@ -43,18 +43,15 @@ class FilterService
   end
 
   def filter_values(query_hash)
-    case query_hash['attribute_key']
-    when 'status'
-      return Conversation.statuses.values if query_hash['values'].include?('all')
+    attribute_key = query_hash['attribute_key']
+    values = query_hash['values']
 
-      query_hash['values'].map { |x| Conversation.statuses[x.to_sym] }
-    when 'message_type'
-      query_hash['values'].map { |x| Message.message_types[x.to_sym] }
-    when 'content'
-      downcase_array_values(query_hash['values'])
-    else
-      case_insensitive_values(query_hash)
-    end
+    return conversation_status_values(values) if attribute_key == 'status'
+    return conversation_priority_values(values) if attribute_key == 'priority'
+    return message_type_values(values) if attribute_key == 'message_type'
+    return downcase_array_values(values) if attribute_key == 'content'
+
+    case_insensitive_values(query_hash)
   end
 
   def downcase_array_values(values)
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 16d13ab71..4183c873d 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -82,6 +82,8 @@ en:
       invalid_operator: Invalid operator. The allowed operators for %{attribute_name} are [%{allowed_keys}].
       invalid_query_operator: Query operator must be either "AND" or "OR".
       invalid_value: Invalid value. The values provided for %{attribute_name} are invalid
+    custom_attribute_definition:
+      key_conflict: The provided key is not allowed as it might conflict with default attributes.
   reports:
     period: Reporting period %{since} to %{until}
     utc_warning: The report generated is in UTC timezone
diff --git a/spec/controllers/api/v1/accounts/custom_attribute_definitions_controller_spec.rb b/spec/controllers/api/v1/accounts/custom_attribute_definitions_controller_spec.rb
index d434381cd..c5be392b6 100644
--- a/spec/controllers/api/v1/accounts/custom_attribute_definitions_controller_spec.rb
+++ b/spec/controllers/api/v1/accounts/custom_attribute_definitions_controller_spec.rb
@@ -89,6 +89,30 @@ RSpec.describe 'Custom Attribute Definitions API', type: :request do
         json_response = response.parsed_body
         expect(json_response['attribute_key']).to eq 'developer_id'
       end
+
+      context 'when creating with a conflicting attribute_key' do
+        let(:standard_key) { CustomAttributeDefinition::STANDARD_ATTRIBUTES[:conversation].first }
+        let(:conflicting_payload) do
+          {
+            custom_attribute_definition: {
+              attribute_display_name: 'Conflicting Key',
+              attribute_key: standard_key,
+              attribute_model: 'conversation_attribute',
+              attribute_display_type: 'text'
+            }
+          }
+        end
+
+        it 'returns error for conflicting key' do
+          post "/api/v1/accounts/#{account.id}/custom_attribute_definitions",
+               headers: user.create_new_auth_token,
+               params: conflicting_payload
+
+          expect(response).to have_http_status(:unprocessable_entity)
+          json_response = response.parsed_body
+          expect(json_response['message']).to include('The provided key is not allowed as it might conflict with default attributes.')
+        end
+      end
     end
   end
 
diff --git a/spec/services/conversations/filter_service_spec.rb b/spec/services/conversations/filter_service_spec.rb
index 45e5be143..53878c780 100644
--- a/spec/services/conversations/filter_service_spec.rb
+++ b/spec/services/conversations/filter_service_spec.rb
@@ -77,6 +77,63 @@ describe Conversations::FilterService do
         expect(result[:count][:all_count]).to be conversations.count
       end
 
+      it 'filter conversations by priority' do
+        conversation = create(:conversation, account: account, inbox: inbox, assignee: user_1, priority: :high)
+        params[:payload] = [
+          {
+            attribute_key: 'priority',
+            filter_operator: 'equal_to',
+            values: ['high'],
+            query_operator: nil,
+            custom_attribute_type: ''
+          }.with_indifferent_access
+        ]
+        result = filter_service.new(params, user_1).perform
+        expect(result[:conversations].length).to eq 1
+        expect(result[:conversations][0][:id]).to eq conversation.id
+      end
+
+      it 'filter conversations by multiple priority values' do
+        high_priority = create(:conversation, account: account, inbox: inbox, assignee: user_1, priority: :high)
+        urgent_priority = create(:conversation, account: account, inbox: inbox, assignee: user_1, priority: :urgent)
+        create(:conversation, account: account, inbox: inbox, assignee: user_1, priority: :low)
+
+        params[:payload] = [
+          {
+            attribute_key: 'priority',
+            filter_operator: 'equal_to',
+            values: %w[high urgent],
+            query_operator: nil,
+            custom_attribute_type: ''
+          }.with_indifferent_access
+        ]
+        result = filter_service.new(params, user_1).perform
+        expect(result[:conversations].length).to eq 2
+        expect(result[:conversations].pluck(:id)).to include(high_priority.id, urgent_priority.id)
+      end
+
+      it 'filter conversations with not_equal_to priority operator' do
+        create(:conversation, account: account, inbox: inbox, assignee: user_1, priority: :high)
+        create(:conversation, account: account, inbox: inbox, assignee: user_1, priority: :urgent)
+        low_priority = create(:conversation, account: account, inbox: inbox, assignee: user_1, priority: :low)
+        medium_priority = create(:conversation, account: account, inbox: inbox, assignee: user_1, priority: :medium)
+
+        params[:payload] = [
+          {
+            attribute_key: 'priority',
+            filter_operator: 'not_equal_to',
+            values: %w[high urgent],
+            query_operator: nil,
+            custom_attribute_type: ''
+          }.with_indifferent_access
+        ]
+        result = filter_service.new(params, user_1).perform
+
+        # Only include conversations with medium and low priority, excluding high and urgent
+        expect(result[:conversations].length).to eq 2
+        expect(result[:conversations].pluck(:id)).to include(low_priority.id, medium_priority.id)
+      end
+
       it 'filter conversations by additional_attributes and status with pagination' do
         params[:payload] = payload
         params[:page] = 2