A method is provided for on-demand communications in a communication
network with support for a plurality of communication units participating
in a common communication, which includes multiple signal initiators,
each supplying a signal, which are virtually simultaneously conveyed as
part of the common communication. At least one example of an on-demand
communication includes push to talk. Additionally, a signal initiator is
provided, which is adapted to support on-demand communications in a
multi-signal initiator environment.