diff --git a/openbsc/src/libmgcp/mgcp_network.c b/openbsc/src/libmgcp/mgcp_network.c
index 5629e84..7dcf3f3 100644
--- a/openbsc/src/libmgcp/mgcp_network.c
+++ b/openbsc/src/libmgcp/mgcp_network.c
@@ -582,13 +582,13 @@
 		int cont;
 		int nbytes = 0;
 		int len = rc;
-		mgcp_patch_and_count(endp, rtp_state, rtp_end, addr, buf, len);
 		do {
 			cont = endp->cfg->rtp_processing_cb(endp, rtp_end,
 							buf, &len, RTP_BUF_SIZE);
 			if (cont < 0)
 				break;
 
+			mgcp_patch_and_count(endp, rtp_state, rtp_end, addr, buf, len);
 			forward_data(rtp_end->rtp.fd, &endp->taps[tap_idx],
 				     buf, len);
 			rc = mgcp_udp_send(rtp_end->rtp.fd,