diff --git a/library/BSSGP_Emulation.ttcn b/library/BSSGP_Emulation.ttcn
index 9021f08..849e147 100644
--- a/library/BSSGP_Emulation.ttcn
+++ b/library/BSSGP_Emulation.ttcn
@@ -588,6 +588,14 @@
 		var octetstring llc_enc := enc_PDU_LLC(valueof(ts_LLC_UI(l3_enc, sapi, '1'B, n_u)));
 		BSCP.send(f_BnsUdReq(ts_BSSGP_DL_UD(ClientTable[idx].tlli, llc_enc), g_cfg.bvci));
 	}
+	[not g_cfg.sgsn_role] BSSGP_SP.receive(PDU_L3_MS_SGSN:?) -> value l3_mo sender vc_conn {
+		var integer idx := f_tbl_idx_by_comp(vc_conn);
+		var octetstring l3_enc := enc_PDU_L3_MS_SGSN(l3_mo);
+		var BIT4 sapi := f_llc_sapi_by_l3_mo(l3_mo);
+		var integer n_u := f_llc_get_n_u_tx(ClientTable[idx].llc[bit2int(sapi)]);
+		var octetstring llc_enc := enc_PDU_LLC(valueof(ts_LLC_UI(l3_enc, sapi, '1'B, n_u)));
+		BSCP.send(f_BnsUdReq(ts_BSSGP_UL_UD(ClientTable[idx].tlli, ClientTable[idx].cell_id, llc_enc), g_cfg.bvci));
+	}
 
 	[] BSSGP_SP.receive(PDU_LLC:?) -> value llc sender vc_conn {
 		var integer idx := f_tbl_idx_by_comp(vc_conn);