Each Connection provides Channels, which allow the local application to exchange data with the remote server, for instance to retrieve a list of contacts in a chat room, or to send a message to a contact.
Channels always provide at least two D-Bus interfaces interfaces: org.freedesktop.telepathy.Channel, and another interface according to the type of channel it is (which can be retrieved using the ChannelType property). For instance, a text channel provides the org.freedesktop.telepathy.ChannelType.Text interface.
The channel types currently available in Telepathy are:
This channel provides a list of people on the server, such as the contacts to whose presence information you are subscribed or the contacts to whom you publish your presence information.
This channel sends and receives text messages, such as instant messages.
This channel is for voice and video calls.
A channel type for transferring files.
File transfers are covered in-depth in Chapter 9 ― Transferring Files.
Tubes are channels that enable contact-to-contact networking. See Chapter 11 ― Tubes.
A channel type for listing named channels (e.g. chatrooms) available on the server.
A channel type for searching for contacts on the server.