diff --git a/daemon/call.c b/daemon/call.c
index fdeb281a4..46871757a 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -1067,15 +1067,17 @@ void call_stream_crypto_reset(struct packet_stream *ps) {
 
 	crypto_reset(&ps->crypto);
 
-	mutex_lock(&ps->in_lock);
-	if (ps->ssrc_in)
-		ps->ssrc_in->srtp_index = 0;
-	mutex_unlock(&ps->in_lock);
-
-	mutex_lock(&ps->out_lock);
-	if (ps->ssrc_out)
-		ps->ssrc_out->srtp_index = 0;
-	mutex_unlock(&ps->out_lock);
+	if (PS_ISSET(ps, RTP)) {
+		mutex_lock(&ps->in_lock);
+		if (ps->ssrc_in)
+			ps->ssrc_in->srtp_index = 0;
+		mutex_unlock(&ps->in_lock);
+
+		mutex_lock(&ps->out_lock);
+		if (ps->ssrc_out)
+			ps->ssrc_out->srtp_index = 0;
+		mutex_unlock(&ps->out_lock);
+	}
 }
 
 /* called with call locked in R or W, but ps not locked */