diff --git a/bsc/MSC_ConnectionHandler.ttcn b/bsc/MSC_ConnectionHandler.ttcn
index 1a5bed9..16a0547 100644
--- a/bsc/MSC_ConnectionHandler.ttcn
+++ b/bsc/MSC_ConnectionHandler.ttcn
@@ -361,6 +361,7 @@
 	GsmFrameNumber	fn,
 	hexstring	imsi,
 	RslLinkId	link_id,
+	integer		media_nr, /* determins MGCP EP, port numbers */
 	BSSMAP_IE_SpeechCodecList ass_codec_list optional,
 	TestHdlrEncrParams encr optional
 };
@@ -370,6 +371,7 @@
 	fn := 23,
 	imsi := '001019876543210'H,
 	link_id := valueof(ts_RslLinkID_DCCH(0)),
+	media_nr := 1,
 	ass_codec_list := omit,
 	encr := omit
 }
@@ -712,7 +714,7 @@
 /* establish a channel fully, expecting an assignment matching 'exp' */
 function f_establish_fully(template (omit) PDU_BSSAP ass_tpl, template PDU_BSSAP exp_ass_cpl)
 runs on MSC_ConnHdlr {
-	f_MscConnHdlr_init(1, "127.0.0.2", "127.0.0.3");
+	f_MscConnHdlr_init(g_pars.media_nr, "127.0.0.2", "127.0.0.3");
 
 	f_create_chan_and_exp();
 	/* we should now have a COMPL_L3 at the MSC */