MSC: fix SM-RP-OA (SMSC Address) expectations for MT SMS

Since [1] we started to match the SMSC Address in f_mt_sms_expect().
That change caused test case failures because OsmoMSC hard-codes
a different SMSC Address. Let's fix this.

[1] Ib467eeca6439bc6cce72293fbb5bb48f6d233db9

Change-Id: I3bdb6a74c8b02e4bf8dc88634e2380c924242b4b
diff --git a/msc/BSC_ConnectionHandler.ttcn b/msc/BSC_ConnectionHandler.ttcn
index ccebba1..eae5e56 100644
--- a/msc/BSC_ConnectionHandler.ttcn
+++ b/msc/BSC_ConnectionHandler.ttcn
@@ -1660,8 +1660,9 @@
 	rp := {
 		msg_ref := '42'O,
 		/* We don't really need to have both SM-RP-DA/OA here, because only one IE
-		 * is included in MO/MT SMS, and in the most cases it's the SMSC address. */
-		smsc_addr := t_RP_Addr('76722337'H)
+		 * is included in MO/MT SMS, and in the most cases it's the SMSC address.
+		 * NOTE: this address is currently hard-coded by OsmoMSC. */
+		smsc_addr := t_RP_Addr('447785016005'H)
 	},
 	tid := 0,
 	dlci := '03'O,