forward incoming REFER to FS (#34)

lib/call-session.js

@@ -455,6 +455,7 @@ class CallSession extends Emitter {
     uac.on('modify', this._onReinvite.bind(this, uac));
 
     uas.on('refer', this._onFeatureServerTransfer.bind(this, uas));
+    uac.on('refer', this._onRefer.bind(this, uac));
 
     uas.on('info', this._onInfo.bind(this, uas));
     uac.on('info', this._onInfo.bind(this, uac));
@@ -463,6 +464,23 @@ class CallSession extends Emitter {
     forwardInDialogRequests(uac,  ['notify', 'options', 'message']);
   }
 
+  async _onRefer(dlg, req, res) {
+    /* REFER coming in from a sip device, forward to feature server */
+    try {
+      const response = await dlg.other.request({
+        method: 'REFER',
+        headers: {
+          'Refer-To': req.get('Refer-To'),
+          'Referred-By': req.get('Referred-By'),
+          'User-Agent': req.get('User-Agent')
+        }
+      });
+      res.send(response.status, response.reason);
+    } catch (err) {
+      this.logger.error({err}, 'CallSession:_onRefer: error handling incoming REFER');
+    }
+  }
+
   async _onDTMF(dlg, payload) {
     this.logger.info({payload}, '_onDTMF');
     try {
@@ -524,6 +542,7 @@ Duration=${payload.duration} `
       }
       else {
         sdp = await dlg.other.modify(response.sdp);
+        this.logger.info({sdp}, 'CallSession:_onReinvite: got sdp from 200 OK to invite we sent');
       }
       opts = {
         ...this.rtpEngineOpts.common,
@@ -537,6 +556,7 @@ Duration=${payload.duration} `
         res.send(488);
         throw new Error(`_onReinvite: rtpengine failed: ${JSON.stringify(response)}`);
       }
+      this.logger.info({sdp: response.sdp}, 'CallSession:_onReinvite: sending back upstream');
       res.send(200, {body: response.sdp});
     } catch (err) {
       this.logger.error(err, 'Error handling reinvite');