diff --git a/lib/call-session.js b/lib/call-session.js
index 7c2afbf..cd41398 100644
--- a/lib/call-session.js
+++ b/lib/call-session.js
@@ -568,7 +568,8 @@ class CallSession extends Emitter {
                 this.logger.info(`rtpengine answer failed with ${JSON.stringify(response)}`);
                 throw new Error(`rtpengine failed: ${response['error-reason']}`);
               }
-              return response.sdp;
+              const sdpTmp = response.sdp.replace('a=sendonly', 'a=sendrecv');
+              return sdpTmp;
             }
           }, {
             cbRequest: async(err, inv) => {