support send refer custom header to referhook (#981)

lib/session/call-session.js

@@ -2351,6 +2351,12 @@ Duration=${duration} `
       try {
         const to = parseUri(req.getParsedHeader('Refer-To').uri);
         const by = parseUri(req.getParsedHeader('Referred-By').uri);
+        const customHeaders = Object.keys(req.headers)
+          .filter((h) => h.toLowerCase().startsWith('x-'))
+          .reduce((acc, h) => {
+            acc[h] = req.get(h);
+            return acc;
+          }, {});
         const b3 = this.b3;
         const httpHeaders = b3 && {b3};
         const json = await this.requestor.request('verb:hook', this._referHook, {
@@ -2363,6 +2369,7 @@ Duration=${duration} `
             referred_by_user: by.scheme === 'tel' ? by.number : by.user,
             referring_call_sid: this.callSid,
             referred_call_sid: null,
+            ...customHeaders
           }
         }, httpHeaders);
 

lib/tasks/dial.js

@@ -361,6 +361,12 @@ class TaskDial extends Task {
         const by = parseUri(req.getParsedHeader('Referred-By').uri);
         const referredBy = req.get('Referred-By');
         const userAgent = req.get('User-Agent');
+        const customHeaders = Object.keys(req.headers)
+          .filter((h) => h.toLowerCase().startsWith('x-'))
+          .reduce((acc, h) => {
+            acc[h] = req.get(h);
+            return acc;
+          }, {});
         this.logger.info({to}, 'refer to parsed');
         const json = await cs.requestor.request('verb:hook', this.referHook, {
           ...(callInfo.toJSON()),
@@ -371,7 +377,8 @@ class TaskDial extends Task {
             ...(userAgent && {sip_user_agent: userAgent}),
             ...(by && {referred_by_user: by.scheme === 'tel' ? by.number : by.user}),
             referring_call_sid,
-            referred_call_sid
+            referred_call_sid,
+            ...customHeaders
           }
         }, httpHeaders);
         if (json && Array.isArray(json)) {