support referby with display name

lib/call-session.js

@@ -998,9 +998,7 @@ Duration=${payload.duration} `
       if (!arr) {
         /* call transfer requested */
         const {gateway} = this.req.locals;
-        const referredBy = req.getParsedHeader('Referred-By');
-        if (!referredBy) return res.send(400);
-        const u = parseUri(referredBy.uri);
+        if (!req.has('Referred-By')) return res.send(400);
         const leaveReferToAlone = req.has('X-Refer-To-Leave-Untouched');
         if (leaveReferToAlone) {
           this.logger.debug({referTo}, 'passing Refer-To header through untouched');
@@ -1030,7 +1028,7 @@ Duration=${payload.duration} `
         // eslint-disable-next-line no-unused-vars
         const {via, from, to, 'call-id':callid, cseq, 'max-forwards':maxforwards,
           // eslint-disable-next-line no-unused-vars
-          'content-length':contentlength, 'refer-to':_referto, 'referred-by':_referredby,
+          'content-length':contentlength, 'refer-to':_referto, 'referred-by': referredby,
           // eslint-disable-next-line no-unused-vars
           'X-Refer-To-Leave-Untouched': _leave,
           ...customHeaders
@@ -1040,7 +1038,7 @@ Duration=${payload.duration} `
           method: 'REFER',
           headers: {
             'Refer-To': `<${stringifyUri(uri)}>`,
-            'Referred-By': `<${stringifyUri(u)}>`,
+            'Referred-By': referredby,
             ...customHeaders
           }
         });