do not retry so fast on failed outbound subs

src/mod/endpoints/mod_sofia/mod_sofia.h

@@ -461,6 +461,7 @@ typedef enum {
 	SUB_STATE_SUBED,
 	SUB_STATE_UNSUBSCRIBE,
 	SUB_STATE_FAILED,
+	SUB_STATE_FAIL_WAIT,
 	SUB_STATE_EXPIRED,
 	SUB_STATE_NOSUB,
 	v_STATE_LAST

src/mod/endpoints/mod_sofia/sofia_presence.c

@@ -4245,8 +4245,6 @@ void sofia_presence_handle_sip_r_subscribe(int status,
 	default:
 		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING, "status (%d) != 200, updated state to SUB_STATE_FAILED.\n", status);
 		gw_sub_ptr->state = SUB_STATE_FAILED;
-		gw_sub_ptr->expires = switch_epoch_time_now(NULL);
-		gw_sub_ptr->retry = switch_epoch_time_now(NULL);
 
 		if (!sofia_private) {
 			nua_handle_destroy(nh);

src/mod/endpoints/mod_sofia/sofia_reg.c

@@ -253,6 +253,15 @@ void sofia_sub_check_gateway(sofia_profile_t *profile, time_t now)
 				break;
 
 			case SUB_STATE_FAILED:
+				gw_sub_ptr->expires = now;
+				gw_sub_ptr->retry = now + gw_sub_ptr->retry_seconds;
+				gw_sub_ptr->state = SUB_STATE_FAIL_WAIT;
+				break;
+			case SUB_STATE_FAIL_WAIT:
+				if (!gw_sub_ptr->retry || now >= gw_sub_ptr->retry) {
+					gw_sub_ptr->state = SUB_STATE_UNSUBED;
+				}
+				break;
 			case SUB_STATE_TRYING:
 				if (gw_sub_ptr->retry && now >= gw_sub_ptr->retry) {
 					gw_sub_ptr->state = SUB_STATE_UNSUBED;