feature: specify user or host part of From uri on outdial

lib/tasks/specs.json

@@ -387,6 +387,7 @@
         "enum": ["GET", "POST"]
       },
       "headers": "object",
+      "from": "#dialFrom",
       "name": "string",
       "number": "string",
       "sipUri": "string",
@@ -400,6 +401,14 @@
       "type"
     ]
   },
+  "dialFrom": {
+    "properties": {
+      "user": "string",
+      "host": "string"
+    },
+    "required": [
+    ]
+  },
   "auth": {
     "properties": {
       "username": "string",

lib/utils/place-outdial.js

@@ -21,6 +21,7 @@ class SingleDialer extends Emitter {
 
     this.logger = logger;
     this.target = target;
+    this.from = target.from || {};
     this.sbcAddress = sbcAddress;
     this.opts = opts;
     this.application = application;
@@ -66,6 +67,8 @@ class SingleDialer extends Emitter {
     opts.headers = {
       ...opts.headers,
       ...(this.target.headers || {}),
+      ...(this.from.user && {'X-Preferred-From-User': this.from.user}),
+      ...(this.from.host && {'X-Preferred-From-Host': this.from.host}),
       'X-Jambonz-Routing': this.target.type,
       'X-Call-Sid': this.callSid,
       ...(this.applicationSid && {'X-Application-Sid': this.applicationSid})