diff --git a/src/libosmo-mgcp/mgcp_trunk.c b/src/libosmo-mgcp/mgcp_trunk.c
index f3785cd..55a8953 100644
--- a/src/libosmo-mgcp/mgcp_trunk.c
+++ b/src/libosmo-mgcp/mgcp_trunk.c
@@ -47,7 +47,7 @@
 
 	trunk->audio_send_ptime = 1;
 	trunk->audio_send_name = 1;
-	trunk->vty_number_endpoints = 33;
+	trunk->vty_number_endpoints = 32;
 	trunk->omit_rtcp = 0;
 
 	mgcp_trunk_set_keepalive(trunk, MGCP_KEEPALIVE_ONCE);
@@ -67,13 +67,8 @@
 {
 	int i;
 	struct mgcp_endpoint *endp;
-
-	/* Make sure the amount of requested endpoints does not execeed
-	 * sane limits. The VTY already limits the possible amount,
-	 * however miss-initalation of the struct or memory corruption
-	 * could still lead to an excessive allocation of endpoints, so
-	 * better stop early if that is the case. */
-	OSMO_ASSERT(trunk->vty_number_endpoints < 65534);
+	unsigned int number_endpoints;
+	unsigned int first_endpoint_nr;
 
 	/* This function is called once on startup by the VTY to allocate the
 	 * endpoints. The number of endpoints must not change througout the
@@ -81,15 +76,39 @@
 	OSMO_ASSERT(trunk->number_endpoints == 0);
 	OSMO_ASSERT(trunk->endpoints == NULL);
 
+	switch (trunk->trunk_type) {
+	case MGCP_TRUNK_VIRTUAL:
+		/* Due to historical reasons the endpoints on the virtual
+		 * trunk start counting at 1. */
+		first_endpoint_nr = 1;
+		number_endpoints = trunk->vty_number_endpoints;
+		break;
+	case MGCP_TRUNK_E1:
+		/* The first timeslot on an E1 line is reserved for framing
+		 * and alignment and can not be used for audio transport */
+	        first_endpoint_nr = 1 * MGCP_ENDP_E1_SUBSLOTS;
+		number_endpoints = 31 * MGCP_ENDP_E1_SUBSLOTS;
+		break;
+	default:
+		OSMO_ASSERT(false);
+	}
+
+	/* Make sure the amount of requested endpoints does not execeed
+	 * sane limits. The VTY already limits the possible amount,
+	 * however miss-initialization of the struct or memory corruption
+	 * could still lead to an excessive allocation of endpoints, so
+	 * better stop early if that is the case. */
+	OSMO_ASSERT(number_endpoints < 65534);
+
 	/* allocate pointer array for the endpoints */
 	trunk->endpoints = _talloc_zero_array(trunk->cfg,
-					     sizeof(struct mgcp_endpoint *), trunk->vty_number_endpoints, "endpoints");
+					      sizeof(struct mgcp_endpoint *), number_endpoints, "endpoints");
 	if (!trunk->endpoints)
 		return -1;
 
 	/* create endpoints */
-	for (i = 0; i < trunk->vty_number_endpoints; ++i) {
-		endp = mgcp_endp_alloc(trunk, i);
+	for (i = 0; i < number_endpoints; i++) {
+		endp = mgcp_endp_alloc(trunk, i + first_endpoint_nr);
 		if (!endp) {
 			talloc_free(trunk->endpoints);
 			return -1;
@@ -98,7 +117,7 @@
 	}
 
 	/* make the endpoints we just created available to the MGW code */
-	trunk->number_endpoints = trunk->vty_number_endpoints;
+	trunk->number_endpoints = number_endpoints;
 
 	return 0;
 }
diff --git a/src/libosmo-mgcp/mgcp_vty.c b/src/libosmo-mgcp/mgcp_vty.c
index 2f862f1..35b75fb 100644
--- a/src/libosmo-mgcp/mgcp_vty.c
+++ b/src/libosmo-mgcp/mgcp_vty.c
@@ -112,7 +112,7 @@
 		trunk->audio_send_name ? "" : "no ", VTY_NEWLINE);
 	vty_out(vty, " loop %u%s", ! !trunk->audio_loop, VTY_NEWLINE);
 	vty_out(vty, " number endpoints %u%s",
-		trunk->vty_number_endpoints - 1, VTY_NEWLINE);
+		trunk->vty_number_endpoints, VTY_NEWLINE);
 	vty_out(vty, " %sallow-transcoding%s",
 		trunk->no_audio_transcoding ? "no " : "", VTY_NEWLINE);
 	if (g_cfg->call_agent_addr)
@@ -289,7 +289,7 @@
 
 	vty_out(vty, "%s trunk %d with %d endpoints:%s",
 		trunk->trunk_type == MGCP_TRUNK_VIRTUAL ? "Virtual" : "E1",
-		trunk->trunk_nr, trunk->number_endpoints - 1, VTY_NEWLINE);
+		trunk->trunk_nr, trunk->number_endpoints, VTY_NEWLINE);
 
 	if (!trunk->endpoints) {
 		vty_out(vty, "No endpoints allocated yet.%s", VTY_NEWLINE);
@@ -710,13 +710,12 @@
 
 DEFUN(cfg_mgcp_number_endp,
       cfg_mgcp_number_endp_cmd,
-      "number endpoints <0-65534>",
+      "number endpoints <1-65534>",
       "Number options\n" "Endpoints available\n" "Number endpoints\n")
 {
 	struct mgcp_trunk *trunk = mgcp_trunk_by_num(g_cfg, MGCP_TRUNK_VIRTUAL, MGCP_VIRT_TRUNK_ID);
 	OSMO_ASSERT(trunk);
-	/* + 1 as we start counting at one */
-	trunk->vty_number_endpoints = atoi(argv[0]) + 1;
+	trunk->vty_number_endpoints = atoi(argv[0]);
 	return CMD_SUCCESS;
 }