diff --git a/lib/call-session.js b/lib/call-session.js
index 492b392..8cfeab9 100644
--- a/lib/call-session.js
+++ b/lib/call-session.js
@@ -12,7 +12,7 @@ class CallSession extends Emitter {
     this.srf = req.srf;
     this.performLcr = this.srf.locals.dbHelpers.performLcr;
     this.logger = logger.child({callId: req.get('Call-ID')});
-    this.useWss = req.locals.registration && req.locals.registration.protocol === 'wss';  
+    this.useWss = req.locals.registration && req.locals.registration.protocol === 'wss';
     this.stats = this.srf.locals.stats;
     this.activeCallIds = this.srf.locals.activeCallIds;
   }
@@ -88,8 +88,10 @@ class CallSession extends Emitter {
             proxyResponseHeaders: ['all'],
             localSdpB: response.sdp,
             localSdpA: async(sdp, res) => {
-              const opts = Object.assign({sdp, 'to-tag': res.getParsedHeader('To').params.tag},
+              this.toTag = res.getParsedHeader('To').params.tag;
+              const opts = Object.assign({sdp, 'to-tag': this.toTag},
                 this.rtpEngineOpts.answer);
+              this.logger.debug({opts}, 'calling rtpengine answer with these opts');
               const response = await this.answer(opts);
               if ('ok' !== response.result) {
                 this.logger.error(`rtpengine answer failed with ${JSON.stringify(response)}`);
@@ -165,19 +167,24 @@ class CallSession extends Emitter {
 
   async _onReinvite(dlg, req, res) {
     try {
-      let response = await this.offer(Object.assign({sdp: req.body}, this.rtpEngineOpts.offer));
+      const optOffer = Object.assign(this.rtpEngineOpts.offer, {sdp: req.body, 'to-tag': this.toTag});
+      this.logger.debug({opts: optOffer}, 'got reinvite, calling rtpengine offer with these opts');
+      let response = await this.offer(optOffer);
       if ('ok' !== response.result) {
         res.send(488);
         throw new Error(`_onReinvite: rtpengine failed: offer: ${JSON.stringify(response)}`);
       }
+      this.logger.debug({sdp: response.sdp}, 'rtpengine offer returned');
       const sdp = await dlg.other.modify(response.sdp);
-      const opts = Object.assign({sdp, 'to-tag': res.getParsedHeader('To').params.tag},
-        this.rtpEngineOpts.answer);
+      this.logger.debug({sdp}, 'reinvite to feature server returned');
+      const opts = Object.assign(this.rtpEngineOpts.answer, {sdp, 'to-tag': this.toTag});
+      this.logger.debug({opts}, 'in reinvite, calling rtpengine answer with these opts');
       response = await this.answer(opts);
       if ('ok' !== response.result) {
         res.send(488);
         throw new Error(`_onReinvite: rtpengine failed: ${JSON.stringify(response)}`);
       }
+      this.logger.debug({sdp: response.sdp}, 'rtpengine answer returned');
       res.send(200, {body: response.sdp});
     } catch (err) {
       this.logger.error(err, 'Error handling reinvite');