add custom nye headers to completed hook (#1552)

lib/utils/place-outdial.js

@@ -265,10 +265,11 @@ class SingleDialer extends Emitter {
       }
 
       this.dlg
-        .on('destroy', () => {
+        .on('destroy', (req) => {
           const duration = moment().diff(connectTime, 'seconds');
+          const headers = this._extractCustomHeaders(req);
           this.logger.debug('SingleDialer:exec called party hung up');
-          this.emit('callStatusChange', {callStatus: CallStatus.Completed, duration});
+          this.emit('callStatusChange', {callStatus: CallStatus.Completed, duration, ...(headers && {headers})});
           this.ep && this.ep.destroy();
         })
         .on('refresh', () => this.logger.info('SingleDialer:exec - dialog refreshed by uas'))
@@ -530,7 +531,19 @@ class SingleDialer extends Emitter {
     }
   }
 
-  _notifyCallStatusChange({callStatus, sipStatus, sipReason, duration}) {
+  _extractCustomHeaders(req) {
+    const dominated = ['via', 'from', 'to', 'call-id', 'cseq', 'max-forwards',
+      'content-length', 'contact', 'route', 'record-route', 'content-type',
+      'authorization', 'proxy-authorization', 'www-authenticate', 'proxy-authenticate'];
+    if (!req || !req.headers) return null;
+    const headers = {};
+    Object.keys(req.headers).forEach((h) => {
+      if (!dominated.includes(h)) headers[h] = req.headers[h];
+    });
+    return Object.keys(headers).length ? headers : null;
+  }
+
+  _notifyCallStatusChange({callStatus, sipStatus, sipReason, duration, headers}) {
     assert((typeof duration === 'number' && callStatus === CallStatus.Completed) ||
       (!duration && callStatus !== CallStatus.Completed),
     'duration MUST be supplied when call completed AND ONLY when call completed');
@@ -538,6 +551,7 @@ class SingleDialer extends Emitter {
     if (this.callInfo) {
       this.callInfo.updateCallStatus(callStatus, sipStatus, sipReason);
       if (typeof duration === 'number') this.callInfo.duration = duration;
+      if (headers) this.callInfo.sipHeaders = headers;
       try {
         this.notifier.request('call:status', this.application.call_status_hook, this.callInfo.toJSON());
       } catch (err) {