diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index 0e75430..2616ac4 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -60,27 +60,6 @@
 
 #define PTMSI_ALLOC
 
-/* Section 11.2.2 / Table 11.3a GPRS Mobility management timers – MS side */
-#define GSM0408_T3312_SECS	(10*60)	/* periodic RAU interval, default 54min */
-
-/* Section 11.2.2 / Table 11.4 MM timers netwokr side */
-#define GSM0408_T3322_SECS	6	/* DETACH_REQ -> DETACH_ACC */
-#define GSM0408_T3350_SECS	6	/* waiting for ATT/RAU/TMSI COMPL */
-#define GSM0408_T3360_SECS	6	/* waiting for AUTH/CIPH RESP */
-#define GSM0408_T3370_SECS	6	/* waiting for ID RESP */
-
-/* Section 11.2.2 / Table 11.4a MM timers netwokr side */
-#define GSM0408_T3313_SECS	30	/* waiting for paging response */
-#define GSM0408_T3314_SECS	44	/* force to STBY on expiry, Ready timer */
-#define GSM0408_T3316_SECS	44
-#define GSM0408_MOBILE_REACHABLE_SECS (GSM0408_T3312_SECS + 4 * 60)
-
-/* Section 11.3 / Table 11.2d Timers of Session Management - network side */
-#define GSM0408_T3385_SECS	8	/* wait for ACT PDP CTX REQ */
-#define GSM0408_T3386_SECS	8	/* wait for MODIFY PDP CTX ACK */
-#define GSM0408_T3395_SECS	8	/* wait for DEACT PDP CTX ACK */
-#define GSM0408_T3397_SECS	8	/* wait for DEACT AA PDP CTX ACK */
-
 extern struct sgsn_instance *sgsn;
 
 static const struct tlv_definition gsm48_gmm_att_tlvdef = {
@@ -146,7 +125,7 @@
 
 time_t gprs_max_time_to_idle(void)
 {
-	return GSM0408_T3314_SECS + GSM0408_MOBILE_REACHABLE_SECS;
+	return sgsn->cfg.timers.T3314 + (sgsn->cfg.timers.T3312 + 4 * 60);
 }
 
 /* Send a message through the underlying layer */
@@ -319,7 +298,7 @@
 	aa = (struct gsm48_attach_ack *) msgb_put(msg, sizeof(*aa));
 	aa->force_stby = 0;	/* not indicated */
 	aa->att_result = 1;	/* GPRS only */
-	aa->ra_upd_timer = gprs_secs_to_tmr_floor(GSM0408_T3312_SECS);
+	aa->ra_upd_timer = gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3312);
 	aa->radio_prio = 4;	/* lowest */
 	gsm48_construct_ra(aa->ra_id.digits, &mm->ra);
 
@@ -337,7 +316,7 @@
 	 * the inactivity time READY->STANDBY.
 	 */
 	msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY,
-		    gprs_secs_to_tmr_floor(GSM0408_T3314_SECS));
+		    gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3314));
 
 #ifdef PTMSI_ALLOC
 	/* Optional: Allocated P-TMSI */
@@ -627,12 +606,12 @@
 	/* Request IMSI and IMEI from the MS if they are unknown */
 	if (!strlen(ctx->imei)) {
 		ctx->t3370_id_type = GSM_MI_TYPE_IMEI;
-		mmctx_timer_start(ctx, 3370, GSM0408_T3370_SECS);
+		mmctx_timer_start(ctx, 3370, sgsn->cfg.timers.T3370);
 		return gsm48_tx_gmm_id_req(ctx, GSM_MI_TYPE_IMEI);
 	}
 	if (!strlen(ctx->imsi)) {
 		ctx->t3370_id_type = GSM_MI_TYPE_IMSI;
-		mmctx_timer_start(ctx, 3370, GSM0408_T3370_SECS);
+		mmctx_timer_start(ctx, 3370, sgsn->cfg.timers.T3370);
 		return gsm48_tx_gmm_id_req(ctx, GSM_MI_TYPE_IMSI);
 	}
 
@@ -654,7 +633,7 @@
 	if (ctx->auth_state == SGSN_AUTH_AUTHENTICATE && !ctx->is_authenticated) {
 		struct gsm_auth_tuple *at = &ctx->auth_triplet;
 
-		mmctx_timer_start(ctx, 3360, GSM0408_T3360_SECS);
+		mmctx_timer_start(ctx, 3360, sgsn->cfg.timers.T3360);
 		return gsm48_tx_gmm_auth_ciph_req(ctx, at->rand, at->key_seq,
 						  GPRS_ALGO_GEA0);
 	}
@@ -685,7 +664,7 @@
 		extract_subscr_hlr(ctx);
 #ifdef PTMSI_ALLOC
 		/* Start T3350 and re-transmit up to 5 times until ATTACH COMPLETE */
-		mmctx_timer_start(ctx, 3350, GSM0408_T3350_SECS);
+		mmctx_timer_start(ctx, 3350, sgsn->cfg.timers.T3350);
 		ctx->t3350_mode = GMM_T3350_MODE_ATT;
 #else
 		memset(&sig_data, 0, sizeof(sig_data));
@@ -1054,7 +1033,7 @@
 	rua = (struct gsm48_ra_upd_ack *) msgb_put(msg, sizeof(*rua));
 	rua->force_stby = 0;	/* not indicated */
 	rua->upd_result = 0;	/* RA updated */
-	rua->ra_upd_timer = gprs_secs_to_tmr_floor(GSM0408_T3312_SECS);
+	rua->ra_upd_timer = gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3312);
 
 	gsm48_construct_ra(rua->ra_id.digits, &mm->ra);
 
@@ -1076,7 +1055,7 @@
 
 	/* Optional: Negotiated READY timer value */
 	msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY,
-		    gprs_secs_to_tmr_floor(GSM0408_T3314_SECS));
+		    gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3314));
 
 	/* Option: MS ID, ... */
 	return gsm48_gmm_sendmsg(msg, 0, mm);
@@ -1218,7 +1197,7 @@
 	}
 	/* Start T3350 and re-transmit up to 5 times until ATTACH COMPLETE */
 	mmctx->t3350_mode = GMM_T3350_MODE_RAU;
-	mmctx_timer_start(mmctx, 3350, GSM0408_T3350_SECS);
+	mmctx_timer_start(mmctx, 3350, sgsn->cfg.timers.T3350);
 
 	mmctx->mm_state = GMM_COMMON_PROC_INIT;
 #else
@@ -1437,7 +1416,7 @@
 				  "T3350 mode wasn't set, ignoring timeout\n");
 			break;
 		}
-		osmo_timer_schedule(&mm->timer, GSM0408_T3350_SECS, 0);
+		osmo_timer_schedule(&mm->timer, sgsn->cfg.timers.T3350, 0);
 		break;
 	case 3360:	/* waiting for AUTH AND CIPH RESP */
 		if (mm->num_T_exp >= 5) {
@@ -1455,7 +1434,7 @@
 		at = &mm->auth_triplet;
 
 		gsm48_tx_gmm_auth_ciph_req(mm, at->rand, at->key_seq, GPRS_ALGO_GEA0);
-		osmo_timer_schedule(&mm->timer, GSM0408_T3360_SECS, 0);
+		osmo_timer_schedule(&mm->timer, sgsn->cfg.timers.T3360, 0);
 		break;
 	case 3370:	/* waiting for IDENTITY RESPONSE */
 		if (mm->num_T_exp >= 5) {
@@ -1466,7 +1445,7 @@
 		}
 		/* re-tranmit IDENTITY REQUEST and re-start timer */
 		gsm48_tx_gmm_id_req(mm, mm->t3370_id_type);
-		osmo_timer_schedule(&mm->timer, GSM0408_T3370_SECS, 0);
+		osmo_timer_schedule(&mm->timer, sgsn->cfg.timers.T3370, 0);
 		break;
 	default:
 		LOGMMCTXP(LOGL_ERROR, mm, "timer expired in unknown mode %u\n",
@@ -1605,7 +1584,7 @@
 }
 int gsm48_tx_gsm_deact_pdp_req(struct sgsn_pdp_ctx *pdp, uint8_t sm_cause)
 {
-	pdpctx_timer_start(pdp, 3395, GSM0408_T3395_SECS);
+	pdpctx_timer_start(pdp, 3395, sgsn->cfg.timers.T3395);
 
 	return _gsm48_tx_gsm_deact_pdp_req(pdp->mm, pdp->ti, sm_cause);
 }
@@ -1989,7 +1968,7 @@
 			break;
 		}
 		gsm48_tx_gsm_deact_pdp_req(pdp, GSM_CAUSE_NET_FAIL); 
-		osmo_timer_schedule(&pdp->timer, GSM0408_T3395_SECS, 0);
+		osmo_timer_schedule(&pdp->timer, sgsn->cfg.timers.T3395, 0);
 		break;
 	default:
 		LOGPDPCTXP(LOGL_ERROR, pdp, "timer expired in unknown mode %u\n",
diff --git a/openbsc/src/gprs/sgsn_vty.c b/openbsc/src/gprs/sgsn_vty.c
index f818221..b74d01a 100644
--- a/openbsc/src/gprs/sgsn_vty.c
+++ b/openbsc/src/gprs/sgsn_vty.c
@@ -54,6 +54,60 @@
 	{ 0, NULL }
 };
 
+/* Section 11.2.2 / Table 11.3a GPRS Mobility management timers – MS side */
+#define GSM0408_T3312_SECS	(10*60)	/* periodic RAU interval, default 54min */
+
+/* Section 11.2.2 / Table 11.4 MM timers netwokr side */
+#define GSM0408_T3322_SECS	6	/* DETACH_REQ -> DETACH_ACC */
+#define GSM0408_T3350_SECS	6	/* waiting for ATT/RAU/TMSI COMPL */
+#define GSM0408_T3360_SECS	6	/* waiting for AUTH/CIPH RESP */
+#define GSM0408_T3370_SECS	6	/* waiting for ID RESP */
+
+/* Section 11.2.2 / Table 11.4a MM timers netwokr side */
+#define GSM0408_T3313_SECS	30	/* waiting for paging response */
+#define GSM0408_T3314_SECS	44	/* force to STBY on expiry, Ready timer */
+#define GSM0408_T3316_SECS	44
+
+/* Section 11.3 / Table 11.2d Timers of Session Management - network side */
+#define GSM0408_T3385_SECS	8	/* wait for ACT PDP CTX REQ */
+#define GSM0408_T3386_SECS	8	/* wait for MODIFY PDP CTX ACK */
+#define GSM0408_T3395_SECS	8	/* wait for DEACT PDP CTX ACK */
+#define GSM0408_T3397_SECS	8	/* wait for DEACT AA PDP CTX ACK */
+
+#define DECLARE_TIMER(number, doc) \
+    DEFUN(cfg_sgsn_T##number,					\
+      cfg_sgsn_T##number##_cmd,					\
+      "timer t" #number  " <0-65535>",				\
+      "Configure GPRS Timers\n"					\
+      doc "Timer Value in seconds\n")				\
+{								\
+	int value = atoi(argv[0]);				\
+								\
+	if (value < 0 || value > 65535) {			\
+		vty_out(vty, "Timer value %s out of range.%s",	\
+		        argv[0], VTY_NEWLINE);			\
+		return CMD_WARNING;				\
+	}							\
+								\
+	g_cfg->timers.T##number = value;			\
+	return CMD_SUCCESS;					\
+}
+
+DECLARE_TIMER(3312, "Periodic RA Update timer (s)")
+DECLARE_TIMER(3322, "Detach reqest -> accept timer (s)")
+DECLARE_TIMER(3350, "Waiting for ATT/RAU/TMSI_COMPL timer (s)")
+DECLARE_TIMER(3360, "Waiting for AUTH/CIPH response timer (s)")
+DECLARE_TIMER(3370, "Waiting for IDENTITY response timer (s)")
+
+DECLARE_TIMER(3313, "Waiting for paging response timer (s)")
+DECLARE_TIMER(3314, "Force to STANDBY on expiry timer (s)")
+DECLARE_TIMER(3316, "")
+
+DECLARE_TIMER(3385, "Wait for ACT PDP CTX REQ timer (s)")
+DECLARE_TIMER(3386, "Wait for MODIFY PDP CTX ACK timer (s)")
+DECLARE_TIMER(3395, "Wait for DEACT PDP CTX ACK timer (s)")
+DECLARE_TIMER(3397, "Wait for DEACT AA PDP CTX ACK timer (s)")
+
 
 #define GSM48_MAX_APN_LEN	102	/* 10.5.6.1 */
 static char *gprs_apn2str(uint8_t *apn, unsigned int len)
@@ -181,6 +235,19 @@
 		vty_out(vty, " no cdr filename%s", VTY_NEWLINE);
 	vty_out(vty, " cdr interval %d%s", g_cfg->cdr.interval, VTY_NEWLINE);
 
+	vty_out(vty, " timer t3312 %d%s", g_cfg->timers.T3312, VTY_NEWLINE);
+	vty_out(vty, " timer t3322 %d%s", g_cfg->timers.T3322, VTY_NEWLINE);
+	vty_out(vty, " timer t3350 %d%s", g_cfg->timers.T3350, VTY_NEWLINE);
+	vty_out(vty, " timer t3360 %d%s", g_cfg->timers.T3360, VTY_NEWLINE);
+	vty_out(vty, " timer t3370 %d%s", g_cfg->timers.T3370, VTY_NEWLINE);
+	vty_out(vty, " timer t3313 %d%s", g_cfg->timers.T3313, VTY_NEWLINE);
+	vty_out(vty, " timer t3314 %d%s", g_cfg->timers.T3314, VTY_NEWLINE);
+	vty_out(vty, " timer t3316 %d%s", g_cfg->timers.T3316, VTY_NEWLINE);
+	vty_out(vty, " timer t3385 %d%s", g_cfg->timers.T3385, VTY_NEWLINE);
+	vty_out(vty, " timer t3386 %d%s", g_cfg->timers.T3386, VTY_NEWLINE);
+	vty_out(vty, " timer t3395 %d%s", g_cfg->timers.T3395, VTY_NEWLINE);
+	vty_out(vty, " timer t3397 %d%s", g_cfg->timers.T3397, VTY_NEWLINE);
+
 	return CMD_SUCCESS;
 }
 
@@ -912,6 +979,19 @@
 	install_element(SGSN_NODE, &cfg_ggsn_dynamic_lookup_cmd);
 	install_element(SGSN_NODE, &cfg_grx_ggsn_cmd);
 
+	install_element(SGSN_NODE, &cfg_sgsn_T3312_cmd);
+	install_element(SGSN_NODE, &cfg_sgsn_T3322_cmd);
+	install_element(SGSN_NODE, &cfg_sgsn_T3350_cmd);
+	install_element(SGSN_NODE, &cfg_sgsn_T3360_cmd);
+	install_element(SGSN_NODE, &cfg_sgsn_T3370_cmd);
+	install_element(SGSN_NODE, &cfg_sgsn_T3313_cmd);
+	install_element(SGSN_NODE, &cfg_sgsn_T3314_cmd);
+	install_element(SGSN_NODE, &cfg_sgsn_T3316_cmd);
+	install_element(SGSN_NODE, &cfg_sgsn_T3385_cmd);
+	install_element(SGSN_NODE, &cfg_sgsn_T3386_cmd);
+	install_element(SGSN_NODE, &cfg_sgsn_T3395_cmd);
+	install_element(SGSN_NODE, &cfg_sgsn_T3397_cmd);
+
 	return 0;
 }
 
@@ -921,6 +1001,19 @@
 
 	g_cfg = cfg;
 
+	g_cfg->timers.T3312 = GSM0408_T3312_SECS;
+	g_cfg->timers.T3322 = GSM0408_T3322_SECS;
+	g_cfg->timers.T3350 = GSM0408_T3350_SECS;
+	g_cfg->timers.T3360 = GSM0408_T3360_SECS;
+	g_cfg->timers.T3370 = GSM0408_T3370_SECS;
+	g_cfg->timers.T3313 = GSM0408_T3313_SECS;
+	g_cfg->timers.T3314 = GSM0408_T3314_SECS;
+	g_cfg->timers.T3316 = GSM0408_T3316_SECS;
+	g_cfg->timers.T3385 = GSM0408_T3385_SECS;
+	g_cfg->timers.T3386 = GSM0408_T3386_SECS;
+	g_cfg->timers.T3395 = GSM0408_T3395_SECS;
+	g_cfg->timers.T3397 = GSM0408_T3397_SECS;
+
 	rc = vty_read_config_file(config_file, NULL);
 	if (rc < 0) {
 		fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file);