In the TASSTA framework, channels can serve the same purpose as conference calls elsewhere. In a group that is designated as a conference group, there is no PTT queue. Unlike regular group calls, any user in a conference channel can press PTT and talk without waiting their turn.
Whether or not a group is a conference group is configured on a per-group basis by the administrator in T.Commander. This property is not indicated in the group list, so you should ask your administrator to include this information in conference group names.
At this time, recording of audio from conference groups is not supported.