diff --git a/libs/freetdm/src/include/zap_types.h b/libs/freetdm/src/include/zap_types.h
index 818fed2af8..4055b0c931 100644
--- a/libs/freetdm/src/include/zap_types.h
+++ b/libs/freetdm/src/include/zap_types.h
@@ -277,6 +277,7 @@ typedef enum {
 	ZAP_CHANNEL_STATE_DOWN,
 	ZAP_CHANNEL_STATE_HANGUP,
 	ZAP_CHANNEL_STATE_HOLD,
+	ZAP_CHANNEL_STATE_SUSPENDED,
 	ZAP_CHANNEL_STATE_DIALTONE,
 	ZAP_CHANNEL_STATE_COLLECT,
 	ZAP_CHANNEL_STATE_RING,
@@ -294,7 +295,7 @@ typedef enum {
 	ZAP_CHANNEL_STATE_UP,
 	ZAP_CHANNEL_STATE_INVALID
 } zap_channel_state_t;
-#define CHANNEL_STATE_STRINGS "DOWN", "HANGUP", "HOLD", "DIALTONE", "COLLECT", \
+#define CHANNEL_STATE_STRINGS "DOWN", "HANGUP", "HOLD", "SUSPENDED", "DIALTONE", "COLLECT", \
 		"RING", "BUSY", "ATTN", "GENRING", "DIALING", "GET_CALLERID", "CALLWAITING", \
 		"TERMINATING", "RESTART", "PROGRESS_MEDIA", "PROGRESS", "IDLE", "UP", "INVALID"
 ZAP_STR2ENUM_P(zap_str2zap_channel_state, zap_channel_state2str, zap_channel_state_t)
diff --git a/libs/freetdm/src/zap_io.c b/libs/freetdm/src/zap_io.c
index 77bd0ecc17..477bc8f04f 100644
--- a/libs/freetdm/src/zap_io.c
+++ b/libs/freetdm/src/zap_io.c
@@ -710,7 +710,7 @@ zap_status_t zap_channel_open_any(uint32_t span_id, zap_direction_t direction, z
 			
 			check = &span->channels[i];
 			
-			if (zap_test_flag(check, ZAP_CHANNEL_READY) && !zap_test_flag(check, ZAP_CHANNEL_INUSE)) {
+			if (zap_test_flag(check, ZAP_CHANNEL_READY) && !zap_test_flag(check, ZAP_CHANNEL_INUSE) && !zap_test_flag(check, ZAP_CHANNEL_SUSPENDED)) {
 
 				status = check->zio->open(check);
 				
@@ -787,6 +787,10 @@ zap_status_t zap_channel_open_chan(zap_channel_t *zchan)
 
 	assert(zchan != NULL);
 
+	if (zap_test_flag(zchan, ZAP_CHANNEL_SUSPENDED)) {
+		return ZAP_FAIL;
+	}
+
 	if (!zap_test_flag(zchan, ZAP_CHANNEL_READY) || (status = zap_mutex_trylock(zchan->mutex)) != ZAP_SUCCESS) {
 		return status;
 	}
@@ -815,7 +819,8 @@ zap_status_t zap_channel_open(uint32_t span_id, uint32_t chan_id, zap_channel_t
 
 		check = &globals.spans[span_id].channels[chan_id];
 
-		if (!zap_test_flag(check, ZAP_CHANNEL_READY) || (status = zap_mutex_trylock(check->mutex)) != ZAP_SUCCESS) {
+		if (zap_test_flag(check, ZAP_CHANNEL_SUSPENDED) || 
+			!zap_test_flag(check, ZAP_CHANNEL_READY) || (status = zap_mutex_trylock(check->mutex)) != ZAP_SUCCESS) {
 			goto done;
 		}
 		
diff --git a/libs/freetdm/src/zap_isdn.c b/libs/freetdm/src/zap_isdn.c
index 8a3a14dd3d..af4f89d41f 100644
--- a/libs/freetdm/src/zap_isdn.c
+++ b/libs/freetdm/src/zap_isdn.c
@@ -85,17 +85,29 @@ static L3INT zap_isdn_931_34(void *pvt, L2UCHAR *msg, L2INT mlen)
 		case Q931mes_SERVICE:
 			{
 				Q931ie_ChangeStatus *changestatus = Q931GetIEPtr(gen->ChangeStatus, gen->buf);
-				/* TODO: Handle this properly */
 				if (zchan) {
 					switch (changestatus->NewStatus) {
 					case 0: /* change status to "in service" */
-						//zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_RESTART);
-						break;
+						zap_clear_flag_locked(zchan, ZAP_CHANNEL_SUSPENDED);
+						zap_log(ZAP_LOG_DEBUG, "Channel %d:%d in service\n", zchan->span_id, zchan->chan_id);
+						switch(zchan->state) {
+						case ZAP_CHANNEL_STATE_UP:
+						case ZAP_CHANNEL_STATE_IDLE:
+							zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_TERMINATING);
+							break;
+						case ZAP_CHANNEL_STATE_DOWN:
+							break;
+						default:
+							zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_DOWN);
+							break;
+						}
 					case 1: /* change status to "maintenance" */
-						//zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_RESTART);
+						zap_set_flag_locked(zchan, ZAP_CHANNEL_SUSPENDED);
+						zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_SUSPENDED);
 						break;
 					case 2: /* change status to "out of service" */
-						//zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_RESTART);
+						zap_set_flag_locked(zchan, ZAP_CHANNEL_SUSPENDED);
+						zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_SUSPENDED);
 						break;
 					default: /* unknown */
 						break;