diff --git a/lib/tasks/specs.json b/lib/tasks/specs.json
index 9204711c..76171ca2 100644
--- a/lib/tasks/specs.json
+++ b/lib/tasks/specs.json
@@ -338,6 +338,7 @@
         "type": "string",
         "enum": ["GET", "POST"]
       },
+      "headers": "object",
       "name": "string",
       "number": "string",
       "sipUri": "string",
diff --git a/lib/utils/place-outdial.js b/lib/utils/place-outdial.js
index c6ddc3a2..d2e1062d 100644
--- a/lib/utils/place-outdial.js
+++ b/lib/utils/place-outdial.js
@@ -60,10 +60,16 @@ class SingleDialer extends Emitter {
     opts.headers = opts.headers || {};
     opts.headers = {
       ...opts.headers,
+      ...(this.target.headers || {}),
       'X-Jambonz-Routing': this.target.type,
-      'X-Jambonz-FS-UUID': srf.locals.fsUUID,
       'X-Call-Sid': this.callSid
     };
+    if (srf.locals.fsUUID) {
+      opts.headers = {
+        ...opts.headers,
+        'X-Jambonz-FS-UUID': srf.locals.fsUUID,
+      };
+    }
     this.ms = ms;
     let uri, to;
     try {