diff --git a/gateway/src/http/routes/telegram-webhook.ts b/gateway/src/http/routes/telegram-webhook.ts
index 994751bab2f..94b2d6e9e3c 100644
--- a/gateway/src/http/routes/telegram-webhook.ts
+++ b/gateway/src/http/routes/telegram-webhook.ts
@@ -292,6 +292,7 @@ export function createTelegramWebhookHandler(config: GatewayConfig) {
       } catch (err) {
         if (err instanceof CircuitBreakerOpenError) {
           acknowledgeCallbackQuery(normalized.message.callbackQueryId, "start_command_circuit_open");
+          if (updateId !== undefined) dedupCache.unreserve(updateId);
           return Response.json(
             { error: "Service temporarily unavailable" },
             { status: 503, headers: { "Retry-After": String(err.retryAfterSecs) } },
@@ -490,6 +491,7 @@ export function createTelegramWebhookHandler(config: GatewayConfig) {
       if (err instanceof CircuitBreakerOpenError) {
         tlog.warn({ retryAfterSecs: err.retryAfterSecs }, "Circuit breaker open — returning 503");
         if (isCallback) acknowledgeCallbackQuery(normalized.message.callbackQueryId, "circuit_open");
+        if (updateId !== undefined) dedupCache.unreserve(updateId);
         return Response.json(
           { error: "Service temporarily unavailable" },
           { status: 503, headers: { "Retry-After": String(err.retryAfterSecs) } },
diff --git a/gateway/src/http/routes/twilio-sms-webhook.ts b/gateway/src/http/routes/twilio-sms-webhook.ts
index 97746b5328a..4ec90e6939e 100644
--- a/gateway/src/http/routes/twilio-sms-webhook.ts
+++ b/gateway/src/http/routes/twilio-sms-webhook.ts
@@ -208,6 +208,7 @@ export function createTwilioSmsWebhookHandler(config: GatewayConfig) {
     } catch (err) {
       if (err instanceof CircuitBreakerOpenError) {
         tlog.warn({ retryAfterSecs: err.retryAfterSecs }, "Circuit breaker open — returning 503");
+        dedupCache.unreserve(messageSid);
         return Response.json(
           { error: "Service temporarily unavailable" },
           { status: 503, headers: { "Retry-After": String(err.retryAfterSecs) } },
diff --git a/gateway/src/http/routes/whatsapp-webhook.ts b/gateway/src/http/routes/whatsapp-webhook.ts
index 3494cdbc339..5ac3e26d74a 100644
--- a/gateway/src/http/routes/whatsapp-webhook.ts
+++ b/gateway/src/http/routes/whatsapp-webhook.ts
@@ -209,6 +209,7 @@ export function createWhatsAppWebhookHandler(config: GatewayConfig) {
       } catch (err) {
         if (err instanceof CircuitBreakerOpenError) {
           tlog.warn({ retryAfterSecs: err.retryAfterSecs }, "Circuit breaker open — returning 503");
+          dedupCache.unreserve(whatsappMessageId);
           return Response.json(
             { error: "Service temporarily unavailable" },
             { status: 503, headers: { "Retry-After": String(err.retryAfterSecs) } },