diff --git a/lib/call-session.js b/lib/call-session.js
index 071f59e..01d4b95 100644
--- a/lib/call-session.js
+++ b/lib/call-session.js
@@ -552,6 +552,7 @@ Duration=${payload.duration} `
       if (reason && dlg.type === 'uas' && ['release-media', 'anchor-media'].includes(reason)) {
         this.logger.info(`got a reinvite from FS to ${reason}`);
         sdp = dlg.other.remote.sdp;
+        answerMedia.flags = ['asymmetric', 'port latching'];
       }
       else {
         sdp = await dlg.other.modify(response.sdp);