diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 06085c6..a7fdf16 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -4611,7 +4611,7 @@
 private function f_TC_ipa_crcx_mdcx_dlcx_not_active(charstring id) runs on ConnHdlr {
 	f_rsl_transceive(ts_RSL_IPA_CRCX(g_chan_nr), tr_RSL_IPA_CRCX_ACK(g_chan_nr, ?, ?, ?),
 			 "IPA CRCX ACK");
-	var uint32_t remote_ip := f_rnd_int(c_UINT32_MAX);
+	var OCT4 remote_ip := f_rnd_octstring(4);
 	var uint16_t remote_port := f_rnd_int(c_UINT16_MAX);
 	var uint7_t rtp_pt2 := f_rnd_int(127);
 	var uint16_t fake_conn_id := 23; /* we're too lazy to read it out from the CRCX ACK above */
@@ -4632,7 +4632,7 @@
 private function f_TC_ipa_crcx_mdcx_mdcx_dlcx_not_active(charstring id) runs on ConnHdlr {
 	f_rsl_transceive(ts_RSL_IPA_CRCX(g_chan_nr), tr_RSL_IPA_CRCX_ACK(g_chan_nr, ?, ?, ?),
 			 "IPA CRCX ACK");
-	var uint32_t remote_ip := f_rnd_int(c_UINT32_MAX);
+	var OCT4 remote_ip := f_rnd_octstring(4);
 	var uint16_t remote_port := f_rnd_int(c_UINT16_MAX);
 	var uint7_t rtp_pt2 := f_rnd_int(127);
 	var uint16_t fake_conn_id := 23; /* we're too lazy to read it out from the CRCX ACK above */
@@ -4640,7 +4640,7 @@
 			 tr_RSL_IPA_MDCX_ACK(g_chan_nr, ?, ?, ?, rtp_pt2),
 			 "IPA MDCX ACK");
 	/* Second MDCX */
-	remote_ip := f_rnd_int(c_UINT32_MAX);
+	remote_ip := f_rnd_octstring(4);
 	remote_port := f_rnd_int(c_UINT16_MAX);
 	f_rsl_transceive(ts_RSL_IPA_MDCX(g_chan_nr, fake_conn_id, remote_ip, remote_port, rtp_pt2),
 			 tr_RSL_IPA_MDCX_ACK(g_chan_nr, ?, ?, ?, rtp_pt2),