a #TpSimpleObserver instance
a #TpAccount having %TP_ACCOUNT_FEATURE_CORE prepared if possible
a #TpConnection having %TP_CONNECTION_FEATURE_CORE prepared if possible
a #GList of #TpChannel, all having %TP_CHANNEL_FEATURE_CORE prepared if possible
a #TpChannelDispatchOperation or %NULL; the dispatch_operation is not guaranteed to be prepared
a #GList of #TpChannelRequest, all having their object-path defined but are not guaranteed to be prepared.
a #TpObserveChannelsContext representing the context of this D-Bus call
Signature of the implementation of the ObserveChannels method.
This function must call either tp_observe_channels_context_accept(), tp_observe_channels_context_delay() or tp_observe_channels_context_fail() on
contextbefore it returns.