diff --git a/src/libmsc/msc_a.c b/src/libmsc/msc_a.c
index 4d856d0..3bfc0f8 100644
--- a/src/libmsc/msc_a.c
+++ b/src/libmsc/msc_a.c
@@ -541,6 +541,8 @@
 			.channel_type = &channel_type,
 			.osmux_present = msc_a->cc.call_leg->rtp[RTP_TO_RAN]->use_osmux,
 			.osmux_cid = msc_a->cc.call_leg->rtp[RTP_TO_RAN]->local_osmux_cid,
+			.call_id_present = true,
+			.call_id = cc_trans->callref,
 		},
 	};
 	if (msc_a_ran_down(msc_a, MSC_ROLE_I, &msg)) {
diff --git a/src/libmsc/ran_msg_a.c b/src/libmsc/ran_msg_a.c
index 28f99ce..e6dee52 100644
--- a/src/libmsc/ran_msg_a.c
+++ b/src/libmsc/ran_msg_a.c
@@ -959,6 +959,7 @@
 	struct sockaddr_storage rtp_addr;
 	struct sockaddr_storage *use_rtp_addr = NULL;
 	struct msgb *msg;
+	const uint32_t *call_id = NULL;
 	int rc;
 
 	if (!ac->channel_type) {
@@ -999,7 +1000,10 @@
 		}
 	}
 
-	msg = gsm0808_create_ass(ac->channel_type, NULL, use_rtp_addr, use_scl, NULL);
+	if(ac->call_id_present == true)
+		call_id = &ac->call_id;
+
+	msg = gsm0808_create_ass(ac->channel_type, NULL, use_rtp_addr, use_scl, call_id);
 	if (ac->osmux_present)
 		_gsm0808_assignment_extend_osmux(msg, ac->osmux_cid);
 	return msg;