diff --git a/lib/bandwidth_tn_order.rb b/lib/bandwidth_tn_order.rb
index ac8054fa4a839b237a1d52e637a8c7177294b585..b07a44e8a806a4e38a9c667aa2d9dfa7f12da8f6 100644
--- a/lib/bandwidth_tn_order.rb
+++ b/lib/bandwidth_tn_order.rb
@@ -5,6 +5,11 @@ require "ruby-bandwidth-iris"
 Faraday.default_adapter = :em_synchrony
 
 class BandwidthTNOrder
+	ORDER_DEFAULTS = {
+		site_id: CONFIG[:bandwidth_site],
+		peer_id: CONFIG[:bandwidth_peer]
+	}.freeze
+
 	def self.get(id)
 		EMPromise.resolve(nil).then do
 			self.for(BandwidthIris::Order.get_order_response(
@@ -15,15 +20,18 @@ class BandwidthTNOrder
 		end
 	end
 
-	def self.create(tel, name: "sgx-jmp order #{tel}", **kwargs)
+	def self.create(
+		tel,
+		name: "sgx-jmp order #{tel}",
+		reservation_id: nil,
+		**kwargs
+	)
 		EMPromise.resolve(nil).then do
 			Received.new(BandwidthIris::Order.create(
-				name: name, **kwargs,
-				site_id: CONFIG[:bandwidth_site],
-				peer_id: CONFIG[:bandwidth_peer],
+				name: name, **ORDER_DEFAULTS, **kwargs,
 				existing_telephone_number_order_type: {
 					telephone_number_list: { telephone_number: [tel.sub(/^\+?1?/, "")] }
-				}
+				}.merge(ReservationIdList.new(reservation_id).to_h)
 			))
 		end
 	end
@@ -88,4 +96,16 @@ class BandwidthTNOrder
 			raise "Order failed: #{id} #{error_description}"
 		end
 	end
+
+	class ReservationIdList
+		def initialize(reservation_id)
+			@reservation_id = reservation_id
+		end
+
+		def to_h
+			return {} unless @reservation_id
+
+			{ reservation_id_list: { reservation_id: @reservation_id } }
+		end
+	end
 end
diff --git a/test/test_bandwidth_tn_order.rb b/test/test_bandwidth_tn_order.rb
index ffa2bef437dbd008852543a44e33c7a472f4e80c..0328f6ca4842da71013be1cba74654476ef766b0 100644
--- a/test/test_bandwidth_tn_order.rb
+++ b/test/test_bandwidth_tn_order.rb
@@ -11,9 +11,9 @@ class BandwidthTNOrderTest < Minitest::Test
 		).with(
 			body: {
 				Name: "sgx-jmp order +15551234567",
-				CustomerOrderId: "test",
 				SiteId: "test_site",
 				PeerId: "test_peer",
+				CustomerOrderId: "test",
 				ExistingTelephoneNumberOrderType: {
 					TelephoneNumberList: {
 						TelephoneNumber: "5551234567"
@@ -22,10 +22,42 @@ class BandwidthTNOrderTest < Minitest::Test
 			}.to_xml(indent: 0, root: "Order")
 		).to_return(status: 200)
 		BandwidthTNOrder.create("+15551234567", customer_order_id: "test").sync
+
 		assert_requested req
 	end
 	em :test_create
 
+	def test_create_with_reservation
+		req = stub_request(
+			:post,
+			"https://dashboard.bandwidth.com/v1.0/accounts//orders"
+		).with(
+			body: {
+				Name: "sgx-jmp order +15551234567",
+				SiteId: "test_site",
+				PeerId: "test_peer",
+				CustomerOrderId: "test",
+				ExistingTelephoneNumberOrderType: {
+					TelephoneNumberList: {
+						TelephoneNumber: "5551234567"
+					},
+					ReservationIdList: {
+						ReservationId: "res"
+					}
+				}
+			}.to_xml(indent: 0, root: "Order")
+		).to_return(status: 200)
+
+		BandwidthTNOrder.create(
+			"+15551234567",
+			customer_order_id: "test",
+			reservation_id: "res"
+		).sync
+
+		assert_requested req
+	end
+	em :test_create_with_reservation
+
 	def test_for_received
 		order = BandwidthTNOrder.for(BandwidthIris::Order.new(
 			order_status: "RECEIVED"