diff --git a/lib/registration.rb b/lib/registration.rb
index 99588d1bb11120e0ba5d67b7687ca80985bc1045..dea1dc7f48c8bdb9d2b0972f7ae94965292873bc 100644
--- a/lib/registration.rb
+++ b/lib/registration.rb
@@ -2,6 +2,7 @@
 
 require "erb"
 require "ruby-bandwidth-iris"
+require "securerandom"
 
 require_relative "./bandwidth_tn_order"
 require_relative "./em"
@@ -174,8 +175,17 @@ class Registration
 
 			attr_reader :reply, :customer_id, :tel
 
+			def legacy_session_save
+				sid = SecureRandom.hex
+				REDIS.mset(
+					"reg-sid_for-#{customer_id}", sid,
+					"reg-session_tel-#{sid}", tel
+				)
+			end
+
 			def save
 				EMPromise.all([
+					legacy_session_save,
 					REDIS.mset(
 						"pending_tel_for-#{customer_id}", tel,
 						"pending_plan_for-#{customer_id}", @customer.plan_name