The document discusses several Android packages used in Linphone. The org.linphone package contains core activities, fragments, and managers. The org.linphone.compatibility package provides compatibility for different Android APIs. The org.linphone.gcm package includes GCM services used with the SIP server for push notifications. The org.linphone.setup package manages account setup, registration, and login. Finally, the org.linphone.ui package contains UI widgets for buttons, scrolling, and other interactions.