diff --git a/openbsc/include/openbsc/gprs_sgsn.h b/openbsc/include/openbsc/gprs_sgsn.h
index 24e286c..b3f250d 100644
--- a/openbsc/include/openbsc/gprs_sgsn.h
+++ b/openbsc/include/openbsc/gprs_sgsn.h
@@ -369,6 +369,8 @@
  * ottherwise lost state (recovery procedure) */
 int drop_all_pdp_for_ggsn(struct sgsn_ggsn_ctx *ggsn);
 
+void drop_gmm_ctx_for_ms(const char *imsi);
+
 char *gprs_pdpaddr2str(uint8_t *pdpa, uint8_t len);
 
 /*
diff --git a/openbsc/src/gprs/gprs_sgsn.c b/openbsc/src/gprs/gprs_sgsn.c
index e5a54d9..8558029 100644
--- a/openbsc/src/gprs/gprs_sgsn.c
+++ b/openbsc/src/gprs/gprs_sgsn.c
@@ -667,6 +667,44 @@
 	}
 }
 
+/*
+ * High-level function to be called for PDP deactivation initiated from SGSN VTY.
+ * When there are PDP contexts present for a MM context, PDP context will be
+ * deactivated along with GMM Detach(MM context deletion).
+ * If there are no PDP present, MM context will be deleted to avoid further
+ * PDP context activation for that MS.
+ */
+void drop_gmm_ctx_for_ms(const char *imsi)
+{
+	OSMO_ASSERT(imsi != NULL);
+	struct sgsn_mm_ctx *mm;
+	struct sgsn_pdp_ctx *pdp;
+
+	/* Search the MM context subscriber */
+	mm = sgsn_mm_ctx_by_imsi(imsi);
+	LOGMMCTXP(LOGL_INFO, mm,
+		"SGSN intiated Deactivate PDP request for %s\n", imsi);
+	if (mm) {
+		/* Search the PDP for this subscriber */
+		if (llist_empty(&mm->pdp_list)) {
+			/*
+			 * Deleting mm context for the subscriber when no PDP
+			 * context is present.
+			 */
+			gsm0408_gprs_access_cancelled(mm, GMM_CAUSE_GPRS_NOTALLOWED);
+			LOGMMCTXP(LOGL_NOTICE, mm, "No PDP context to deactivate\n");
+		} else {
+			llist_for_each_entry(pdp, &mm->pdp_list, list) {
+				gsm48_tx_gsm_deact_pdp_req(pdp, GSM_CAUSE_DEACT_REGULAR);
+				LOGPDPCTXP(LOGL_INFO, pdp, "PDP Deactivation "
+					"Successful\n");
+			}
+		}
+	} else
+		LOGMMCTXP(LOGL_NOTICE, mm,
+			"No MM context to deactivate for %s\n", imsi);
+}
+
 /* High-level function to be called in case a GGSN has disappeared or
  * otherwise lost state (recovery procedure) */
 int drop_all_pdp_for_ggsn(struct sgsn_ggsn_ctx *ggsn)
diff --git a/openbsc/tests/sgsn/sgsn_test.c b/openbsc/tests/sgsn/sgsn_test.c
index e7b7458..6f01d44 100644
--- a/openbsc/tests/sgsn/sgsn_test.c
+++ b/openbsc/tests/sgsn/sgsn_test.c
@@ -38,14 +38,17 @@
 #include <osmocom/core/rate_ctr.h>
 
 #include <stdio.h>
+#include <gtp.h>
 
 void *tall_bsc_ctx;
+struct gsn_t gsn_ctx;
 static struct sgsn_instance sgsn_inst = {
 	.config_file = "osmo_sgsn.cfg",
 	.cfg = {
 		.gtp_statedir = "./",
 		.auth_policy = SGSN_AUTH_POLICY_CLOSED,
 	},
+	.gsn = &gsn_ctx,
 };
 struct sgsn_instance *sgsn = &sgsn_inst;
 unsigned sgsn_tx_counter = 0;
@@ -2363,6 +2366,138 @@
 	cleanup_test();
 }
 
+static void test_pdp_deactivation_with_pdp_ctx(void)
+{
+	struct apn_ctx *actxs[4];
+	struct sgsn_ggsn_ctx *ggc, *ggcs[3];
+	struct gsm_subscriber *s1;
+	const char *imsi1 = "1234567890";
+	struct sgsn_mm_ctx *ctx;
+	struct gprs_ra_id raid = { 0, };
+	uint32_t local_tlli = 0xffeeddcc;
+	enum gsm48_gsm_cause gsm_cause;
+	struct tlv_parsed tp;
+	uint8_t apn_enc[GSM_APN_LENGTH + 10];
+	struct sgsn_subscriber_pdp_data *pdp_data;
+	char apn_str[GSM_APN_LENGTH];
+
+	printf("Testing Pdp deactivation for MS with pdp ctx\n");
+
+	gprs_gsup_client_send_cb = my_gprs_gsup_client_send_dummy;
+
+	/* Check for emptiness */
+	OSMO_ASSERT(gprs_subscr_get_by_imsi(imsi1) == NULL);
+
+	/* Create a context */
+	OSMO_ASSERT(count(gprs_llme_list()) == 0);
+	ctx = alloc_mm_ctx(local_tlli, &raid);
+	strncpy(ctx->imsi, imsi1, sizeof(ctx->imsi) - 1);
+
+	/* Allocate and attach a subscriber */
+	s1 = gprs_subscr_get_or_create_by_mmctx(ctx);
+	assert_subscr(s1, imsi1);
+
+	struct sgsn_pdp_ctx *pdp;
+
+	tp.lv[GSM48_IE_GSM_APN].len = 0;
+	tp.lv[GSM48_IE_GSM_APN].val = apn_enc;
+
+	tp.lv[OSMO_IE_GSM_REQ_PDP_ADDR].len = 2;
+	tp.lv[OSMO_IE_GSM_REQ_PDP_ADDR].val = apn_enc;
+
+	tp.lv[OSMO_IE_GSM_REQ_QOS].len = 14;
+	tp.lv[OSMO_IE_GSM_REQ_QOS].val = apn_enc;
+
+	ggcs[0] = sgsn_ggsn_ctx_find_alloc(0);
+
+	actxs[0] = sgsn_apn_ctx_find_alloc("test.apn", "123456");
+	actxs[0]->ggsn = ggcs[0];
+
+	pdp_data = sgsn_subscriber_pdp_data_alloc(s1->sgsn_data);
+	pdp_data->context_id = 1;
+	pdp_data->pdp_type = 0x0121;
+	strncpy(pdp_data->apn_str, "*", sizeof(pdp_data->apn_str)-1);
+
+	/* Resolve GGSNs */
+	tp.lv[GSM48_IE_GSM_APN].len =
+		gprs_str_to_apn(apn_enc, sizeof(apn_enc), "Test.Apn");
+
+	ggc = sgsn_mm_ctx_find_ggsn_ctx(ctx, &tp, &gsm_cause, apn_str);
+
+	OSMO_ASSERT(ggc != NULL);
+	OSMO_ASSERT(ggc->id == 0);
+
+	ggc = sgsn_ggsn_ctx_alloc(ggc->id);
+	/* Create a pdp context */
+	pdp = sgsn_create_pdp_ctx(ggc, ctx, 5, &tp);
+
+	/* Intiate PDP deactivation for imsi1 */
+	drop_gmm_ctx_for_ms(imsi1);
+	gsm48_tx_gsm_deact_pdp_acc(pdp);
+	gsm0408_gprs_access_cancelled(ctx, GMM_CAUSE_GPRS_NOTALLOWED);
+
+	/* Cleanup */
+
+	subscr_put(s1);
+
+	sgsn_apn_ctx_free(actxs[0]);
+	sgsn_ggsn_ctx_free(ggcs[0]);
+	sgsn_ggsn_ctx_free(ggc);
+	talloc_free(pdp);
+
+	cleanup_test();
+}
+
+static void test_pdp_deactivation_with_only_mm_ctx(void)
+{
+	struct gsm_subscriber *s1;
+	const char *imsi1 = "1234567890";
+	struct sgsn_mm_ctx *ctx;
+	struct gprs_ra_id raid = { 0, };
+	uint32_t local_tlli = 0xffeeddcc;
+
+	printf("Testing Pdp deactivation for MS with only MM ctx\n");
+
+	gprs_gsup_client_send_cb = my_gprs_gsup_client_send_dummy;
+
+	/* Check for emptiness */
+	OSMO_ASSERT(gprs_subscr_get_by_imsi(imsi1) == NULL);
+
+	/* Create a context */
+	OSMO_ASSERT(count(gprs_llme_list()) == 0);
+	ctx = alloc_mm_ctx(local_tlli, &raid);
+	strncpy(ctx->imsi, imsi1, sizeof(ctx->imsi) - 1);
+
+	/* Allocate and attach a subscriber */
+	s1 = gprs_subscr_get_or_create_by_mmctx(ctx);
+	assert_subscr(s1, imsi1);
+
+	/* Intiate PDP deactivation for imsi1 */
+	drop_gmm_ctx_for_ms(imsi1);
+
+	cleanup_test();
+}
+
+static void test_pdp_deactivation_without_mm_ctx(void)
+{
+	const char *imsi1 = "1234567890";
+
+	printf("Testing Pdp deactivation for MS without MM ctx\n");
+
+	/* Intiate PDP deactivation for imsi1 */
+	drop_gmm_ctx_for_ms(imsi1);
+
+	cleanup_test();
+}
+
+static void test_pdp_deactivation(void)
+{
+	printf("Testing pdp deactivation\n");
+
+	test_pdp_deactivation_with_pdp_ctx();
+	test_pdp_deactivation_without_mm_ctx();
+	test_pdp_deactivation_with_only_mm_ctx();
+}
 static struct log_info_cat gprs_categories[] = {
 	[DMM] = {
 		.name = "DMM",
@@ -2454,6 +2589,7 @@
 	test_gmm_routing_areas();
 	test_apn_matching();
 	test_ggsn_selection();
+	test_pdp_deactivation();
 	printf("Done\n");
 
 	talloc_report_full(osmo_sgsn_ctx, stderr);
diff --git a/openbsc/tests/sgsn/sgsn_test.ok b/openbsc/tests/sgsn/sgsn_test.ok
index c7a53b9..c36b643 100644
--- a/openbsc/tests/sgsn/sgsn_test.ok
+++ b/openbsc/tests/sgsn/sgsn_test.ok
@@ -34,4 +34,8 @@
   - RA Update Request (RA 2 -> RA 2)
 Testing APN matching
 Testing GGSN selection
+Testing pdp deactivation
+Testing Pdp deactivation for MS with pdp ctx
+Testing Pdp deactivation for MS without MM ctx
+Testing Pdp deactivation for MS with only MM ctx
 Done