Fixed following two secnarios

From previous commit, failed to clear the done flag _DN
which cause SUSPEND to think that there was a block
pending, causing state to remain in RESTART

S UP -> relay down -> Tx AIS -> relay up -> Tx AIS off
  -> confirm all back up
  -> In this condition BLO will not go out due to PAUSE

S UP -> Tx AIS -> relay down -> Tx AIS off -> relay up
  -> confirm all back up
  -> In this condition UBL will not go out due to PAUSE

libs/freetdm/src/ftmod/ftmod_sangoma_ss7/ftmod_sangoma_ss7_handle.c

@@ -122,8 +122,11 @@ ftdm_status_t handle_con_ind(uint32_t suInstId, uint32_t spInstId, uint32_t circ
 
 		/* as per Q.764, 2.8.2.3 xiv ... remove the block from this channel */
 		sngss7_clear_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_BLOCK_RX);
+		sngss7_clear_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_BLOCK_RX_DN);
 		sngss7_clear_ckt_blk_flag(sngss7_info, FLAG_GRP_HW_BLOCK_RX);
+		sngss7_clear_ckt_blk_flag(sngss7_info, FLAG_GRP_HW_BLOCK_RX_DN);
 		sngss7_clear_ckt_blk_flag(sngss7_info, FLAG_GRP_MN_BLOCK_RX);
+		sngss7_clear_ckt_blk_flag(sngss7_info, FLAG_GRP_MN_BLOCK_RX_DN);
 
 		/* KONRAD FIX ME : check in case there is a ckt and grp block */
 	}
@@ -1646,7 +1649,6 @@ ftdm_status_t handle_blo_req(uint32_t suInstId, uint32_t spInstId, uint32_t circ
 	/* check if the circuit is already blocked or not */
 	if (sngss7_test_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_BLOCK_RX)) {
 		SS7_WARN("Received BLO on circuit that is already blocked!\n");
-		sngss7_clear_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_BLOCK_RX_DN);
 	}
 
 	/* throw the ckt block flag */

libs/freetdm/src/ftmod/ftmod_sangoma_ss7/ftmod_sangoma_ss7_support.c

@@ -2234,12 +2234,14 @@ ftdm_status_t check_for_reconfig_flag(ftdm_span_t *ftdmspan)
 
 					/* Only locally blocked, thus remove a remote block */
 					sngss7_clear_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_BLOCK_RX);
+					sngss7_clear_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_BLOCK_RX_DN);
 
 					break;
 				/**************************************************************************/
 				case (2):
 					/* remotely blocked */
 					sngss7_set_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_BLOCK_RX);
+					sngss7_set_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_BLOCK_RX_DN);
 
 					/* set the channel to suspended state */
 					SS7_STATE_CHANGE(ftdmchan, FTDM_CHANNEL_STATE_SUSPENDED);
@@ -2247,8 +2249,11 @@ ftdm_status_t check_for_reconfig_flag(ftdm_span_t *ftdmspan)
 				/**************************************************************************/
 				case (3):
 					/* both locally and remotely blocked */
-					sngss7_set_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_UNBLK_TX);
+					if (!sngss7_test_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_BLOCK_TX)) {
+						sngss7_set_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_UNBLK_TX);
+					}
 					sngss7_set_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_BLOCK_RX);
+					sngss7_set_ckt_blk_flag(sngss7_info, FLAG_CKT_MN_BLOCK_RX_DN);
 
 					/* set the channel to suspended state */
 					SS7_STATE_CHANGE(ftdmchan, FTDM_CHANNEL_STATE_SUSPENDED);