diff --git a/openbsc/src/libmgcp/mgcp_network.c b/openbsc/src/libmgcp/mgcp_network.c
index d19b56e..c14b913 100644
--- a/openbsc/src/libmgcp/mgcp_network.c
+++ b/openbsc/src/libmgcp/mgcp_network.c
@@ -248,8 +248,6 @@
 			inet_ntoa(addr->sin_addr), ntohs(addr->sin_port),
 			endp->conn_mode);
 	} else if (state->in_stream.ssrc != rtp_hdr->ssrc) {
-		int32_t tsdelta = state->out_stream.last_tsdelta;
-
 		LOGP(DMGCP, LOGL_NOTICE,
 			"The SSRC changed on 0x%x: %u -> %u  "
 			"from %s:%d in %d\n",
@@ -258,22 +256,36 @@
 			inet_ntoa(addr->sin_addr), ntohs(addr->sin_port),
 			endp->conn_mode);
 
-		if (tsdelta == 0) {
-			tsdelta = rtp_end->rate * rtp_end->frames_per_packet *
-				rtp_end->frame_duration_num /
-				rtp_end->frame_duration_den;
-			LOGP(DMGCP, LOGL_NOTICE,
-			     "Computed timestamp delta %d based on "
-			     "rate %d, num frames %d, frame duration %d/%d\n",
-			     tsdelta, rtp_end->rate, rtp_end->frames_per_packet,
-			     rtp_end->frame_duration_num,
-			     rtp_end->frame_duration_den);
-		}
 		state->in_stream.ssrc = rtp_hdr->ssrc;
-		state->seq_offset = (state->out_stream.last_seq + 1) - seq;
-		state->timestamp_offset =
-			(state->out_stream.last_timestamp + tsdelta) - timestamp;
-		state->patch = rtp_end->force_constant_ssrc;
+		if (rtp_end->force_constant_ssrc) {
+			int32_t tsdelta = state->out_stream.last_tsdelta;
+			if (tsdelta == 0) {
+				tsdelta = rtp_end->rate * rtp_end->frames_per_packet *
+					rtp_end->frame_duration_num /
+					rtp_end->frame_duration_den;
+				LOGP(DMGCP, LOGL_NOTICE,
+				     "Computed timestamp delta %d based on "
+				     "rate %d, num frames %d, frame duration %d/%d\n",
+				     tsdelta, rtp_end->rate, rtp_end->frames_per_packet,
+				     rtp_end->frame_duration_num,
+				     rtp_end->frame_duration_den);
+			}
+			state->seq_offset =
+				(state->out_stream.last_seq + 1) - seq;
+			state->timestamp_offset =
+				(state->out_stream.last_timestamp + tsdelta) -
+				timestamp;
+			state->patch = 1;
+
+			LOGP(DMGCP, LOGL_NOTICE,
+			     "SSRC patching enabled on 0x%x SSRC: %u "
+			     "offset: %d tsdelta: %d "
+			     "from %s:%d in %d\n",
+			     ENDPOINT_NUMBER(endp), state->in_stream.ssrc,
+			     state->seq_offset, tsdelta,
+			     inet_ntoa(addr->sin_addr), ntohs(addr->sin_port),
+			     endp->conn_mode);
+		}
 
 		state->in_stream.last_tsdelta = 0;
 	} else {