diff --git a/msc/BSC_ConnectionHandler.ttcn b/msc/BSC_ConnectionHandler.ttcn
index 24a56b2..9218c76 100644
--- a/msc/BSC_ConnectionHandler.ttcn
+++ b/msc/BSC_ConnectionHandler.ttcn
@@ -15,6 +15,7 @@
 import from General_Types all;
 import from Osmocom_Types all;
 import from Native_Functions all;
+import from Misc_Helpers all;
 import from GSM_Types all;
 import from IPL4asp_Types all;
 import from SCCPasp_Types all;
@@ -813,6 +814,8 @@
 	/* MNCC related parameters */
 	uint32_t mncc_callref optional,			/* call reference on the MNCC side */
 	MNCC_bearer_cap mncc_bearer_cap optional,	/* MNCC-side bearer capabilities */
+	HostName mncc_rtp_ip optional,			/* MNCC Side RTP IP */
+	PortNumber mncc_rtp_port optional,		/* MNCC Side RTP port */
 
 	/* RTP related parameters */
 	HostName bss_rtp_ip optional,			/* BSS Side RTP IP */
@@ -845,6 +848,8 @@
 	emergency := false,
 	mncc_callref := omit,
 	mncc_bearer_cap := valueof(ts_MNCC_bcap_voice),
+	mncc_rtp_ip := "42.23.11.5",
+	mncc_rtp_port := 423,
 	bss_rtp_ip := "9.8.7.6",
 	bss_rtp_port := 9000,
 	mss_rtp_ip := omit,
@@ -979,9 +984,16 @@
 
 		[] MNCC.receive(tr_MNCC_SETUP_cnf(cpars.mncc_callref)) {
 			log("f_mt_call_complete 7");
+			var octetstring ip;
+			var boolean is_ipv6 := f_addr_is_ipv6(cpars.mncc_rtp_ip);
+			if (is_ipv6) {
+				ip := f_inet6_addr(cpars.mncc_rtp_ip);
+			} else {
+				ip := f_inet_addr(cpars.mncc_rtp_ip);
+			}
 			MNCC.send(ts_MNCC_RTP_CONNECT(cpars.mncc_callref,
-						      /* ip 42.23.11.5 */ hex2int('42231105'H),
-						      /* port 423 */ 423,
+						      is_ipv6, ip,
+						      cpars.mncc_rtp_port,
 						      /* payload type 3 = GSM FR */ 3));
 			}
 
@@ -1064,9 +1076,16 @@
 
 		[] MNCC.receive(tr_MNCC_SETUP_cnf(cpars.mncc_callref)) {
 			log("f_mt_call_complete 7.iu");
+			var octetstring ip;
+			var boolean is_ipv6 := f_addr_is_ipv6(cpars.mncc_rtp_ip);
+			if (is_ipv6) {
+				ip := f_inet6_addr(cpars.mncc_rtp_ip);
+			} else {
+				ip := f_inet_addr(cpars.mncc_rtp_ip);
+			}
 			MNCC.send(ts_MNCC_RTP_CONNECT(cpars.mncc_callref,
-						      /* ip 42.23.11.5 */ hex2int('42231105'H),
-						      /* port 423 */ 423,
+						      is_ipv6, ip,
+						      cpars.mncc_rtp_port,
 						      /* payload type 3 = GSM FR */ 3));
 			}
 
@@ -1458,9 +1477,16 @@
 
 		cpars.mncc_callref := mncc.u.signal.callref;
 		/* Call Proceeding */
+		var octetstring ip;
+		var boolean is_ipv6 := f_addr_is_ipv6(cpars.mncc_rtp_ip);
+		if (is_ipv6) {
+			ip := f_inet6_addr(cpars.mncc_rtp_ip);
+		} else {
+			ip := f_inet_addr(cpars.mncc_rtp_ip);
+		}
 		MNCC.send(ts_MNCC_RTP_CONNECT(cpars.mncc_callref,
-					      /* ip 42.23.11.5 */ hex2int('42231105'H),
-					      /* port 423 */ 423,
+					      is_ipv6, ip,
+					      cpars.mncc_rtp_port,
 					      /* payload type 3 = GSM FR */ 3));
 		MNCC.send(ts_MNCC_SETUP_rsp(cpars.mncc_callref));
 		}