sgsn: Ensure ATTACH is always only for GPRS, not combined

OsmoSGSN doesn't do combined GPRS+IMSI Attach.

Change-Id: Ib11f5d720a0e4e1d574982d1f33ba9aaa6b3a3cf
diff --git a/sgsn/SGSN_Tests.ttcn b/sgsn/SGSN_Tests.ttcn
index d667482..c147b84 100644
--- a/sgsn/SGSN_Tests.ttcn
+++ b/sgsn/SGSN_Tests.ttcn
@@ -282,7 +282,7 @@
 	GSUP.receive(tr_GSUP_ISD_RES(g_pars.imsi));
 	GSUP.send(ts_GSUP_UL_RES(g_pars.imsi));
 
-	BSSGP.receive(tr_BD_L3_MT(tr_GMM_ATTACH_ACCEPT(?, ?, ?)));
+	BSSGP.receive(tr_BD_L3_MT(tr_GMM_ATTACH_ACCEPT('001'B, ?, ?)));
 	BSSGP.send(ts_GMM_ATTACH_COMPL);
 	setverdict(pass);
 }
@@ -308,14 +308,14 @@
 
 	BSSGP.send(ts_GMM_ATTACH_REQ(mi, old_ra, false, false, omit, omit));
 	alt {
-	[] BSSGP.receive(tr_BD_L3(tr_GMM_ID_REQ(?))) {
+	[] BSSGP.receive(tr_BD_L3_MT(tr_GMM_ID_REQ(?))) {
 		/* don't send ID Response */
 		repeat;
 		}
-	[] BSSGP.receive(tr_BD_L3(tr_GMM_ATTACH_REJECT('09'O))) {
+	[] BSSGP.receive(tr_BD_L3_MT(tr_GMM_ATTACH_REJECT('09'O))) {
 		setverdict(pass);
 		}
-	[] BSSGP.receive(tr_BD_L3(tr_GMM_ATTACH_REJECT(?))) {
+	[] BSSGP.receive(tr_BD_L3_MT(tr_GMM_ATTACH_REJECT(?))) {
 		setverdict(fail, "Wrong Attach Reject Cause");
 		}
 	}
@@ -344,7 +344,7 @@
 	[] GSUP.receive(tr_GSUP_SAI_REQ(g_pars.imsi)); { }
 	}
 	/* don't send SAI-response from HLR */
-	BSSGP.receive(tr_BD_L3(tr_GMM_ATTACH_REJECT(?)));
+	BSSGP.receive(tr_BD_L3_MT(tr_GMM_ATTACH_REJECT(?)));
 	setverdict(pass);
 }
 testcase TC_attach_auth_sai_timeout() runs on test_CT {
@@ -371,10 +371,10 @@
 	GSUP.receive(tr_GSUP_UL_REQ(g_pars.imsi));
 	/* Never follow-up with ISD_REQ or UL_RES */
 	alt {
-	[] BSSGP.receive(tr_BD_L3(tr_GMM_ATTACH_REJECT(?))) {
+	[] BSSGP.receive(tr_BD_L3_MT(tr_GMM_ATTACH_REJECT(?))) {
 		setverdict(pass);
 		}
-	[] BSSGP.receive(tr_BD_L3(tr_GMM_ATTACH_ACCEPT(?, ?, ?))) {
+	[] BSSGP.receive(tr_BD_L3_MT(tr_GMM_ATTACH_ACCEPT('001'B, ?, ?))) {
 		setverdict(fail);
 		}
 	}
@@ -406,7 +406,7 @@
 	GSUP.receive(tr_GSUP_ISD_RES(g_pars.imsi));
 	GSUP.send(ts_GSUP_UL_RES(g_pars.imsi));
 
-	BSSGP.receive(tr_BD_L3(tr_GMM_ATTACH_ACCEPT('001'B, ?, ?)));
+	BSSGP.receive(tr_BD_L3_MT(tr_GMM_ATTACH_ACCEPT('001'B, ?, ?)));
 	BSSGP.send(ts_GMM_ATTACH_COMPL);
 	setverdict(pass);
 }