diff --git a/openbsc/src/gprs/gb_proxy.c b/openbsc/src/gprs/gb_proxy.c
index 87cfa61..500a1b2 100644
--- a/openbsc/src/gprs/gb_proxy.c
+++ b/openbsc/src/gprs/gb_proxy.c
@@ -246,6 +246,11 @@
 	return gbprox_relay2peer(msg, peer, ns_bvci);
 }
 
+int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
+{
+	return 0;
+}
+
 /* Receive an incoming signalling message from a BSS-side NS-VC */
 static int gbprox_rx_sig_from_bss(struct msgb *msg, struct gprs_nsvc *nsvc,
 				  uint16_t ns_bvci)
diff --git a/openbsc/src/gprs/gprs_llc.c b/openbsc/src/gprs/gprs_llc.c
index c1327b6..be5fe52 100644
--- a/openbsc/src/gprs/gprs_llc.c
+++ b/openbsc/src/gprs/gprs_llc.c
@@ -48,7 +48,6 @@
 	dup.drx_parms = mmctx->drx_parms;
 	dup.ms_ra_cap.len = mmctx->ms_radio_access_capa.len;
 	dup.ms_ra_cap.v = mmctx->ms_radio_access_capa.buf;
-	dup.pdu_lifetime = 1000; /* centi-seconds */
 	memcpy(&dup.qos_profile, qos_profile_default,
 		sizeof(qos_profile_default));
 
@@ -328,7 +327,7 @@
 	/* Identifiers passed down: (BVCI, NSEI) */
 
 	/* Send BSSGP-DL-UNITDATA.req */
-	return _bssgp_tx_dl_ud(msg, 1000, NULL);
+	return _bssgp_tx_dl_ud(msg, NULL);
 }
 
 /* Send XID response to LLE */
diff --git a/openbsc/src/gprs/sgsn_main.c b/openbsc/src/gprs/sgsn_main.c
index a579e7e..5558879 100644
--- a/openbsc/src/gprs/sgsn_main.c
+++ b/openbsc/src/gprs/sgsn_main.c
@@ -49,6 +49,7 @@
 #include <openbsc/vty.h>
 #include <openbsc/sgsn.h>
 #include <openbsc/gprs_llc.h>
+#include <openbsc/gprs_gmm.h>
 
 #include <gtp.h>
 
@@ -99,6 +100,34 @@
 	return rc;
 }
 
+/* call-back function for the BSSGP protocol */
+int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
+{
+	struct osmo_bssgp_prim *bp;
+	bp = container_of(oph, struct osmo_bssgp_prim, oph);
+
+	switch (oph->sap) {
+	case SAP_BSSGP_LL:
+		switch (oph->primitive) {
+		case PRIM_BSSGP_UL_UD:
+			return gprs_llc_rcvmsg(oph->msg, bp->tp);
+		}
+		break;
+	case SAP_BSSGP_GMM:
+		switch (oph->primitive) {
+		case PRIM_BSSGP_GMM_SUSPEND:
+			return gprs_gmm_rx_suspend(bp->ra_id, bp->tlli);
+		case PRIM_BSSGP_GMM_RESUME:
+			return gprs_gmm_rx_resume(bp->ra_id, bp->tlli,
+						  *bp->u.resume.suspend_ref);
+		}
+		break;
+	case SAP_BSSGP_NM:
+		break;
+	}
+	return 0;
+}
+
 static void signal_handler(int signal)
 {
 	fprintf(stdout, "signal %u received\n", signal);