QuickBridge is used by AG nodes that don't have working multicast.
QuickBridge is used for AG nodes on networks that are not multicast-enabled.
However, in order to use QuickBridge, it is necessary to have the cooperation
of a site that is multicast-enabled. It is at the multicast-enabled site that
the QuickBridge software is installed. This site does not need to be taking
part in an AG event, or even have an AG node. No additional software need be
installed at the unicast-only site.