You can add or remove memory modules and VoIP modules in the Branch Gateway main board. To do so, you must pull out the Branch Gateway main board. The Branch Gateway supports hot insertion and removal of the main board without power drop. However, all services are suspended while the Branch Gateway main board is out, and all calls passing through the Branch Gateway are disconnected. Any translation and other data that is in the running configuration but has not been saved to the startup configuration is lost.