Teletrials are considered a 'sub-branch' or type of Decentralized Clinical Trial (DCT). The term DCT is commonly used by sponsors.
The DCT model does not typically specify the difference between a Primary and Satellite Site but conceives of a spectrum of activities that may be interpreted according to sponsors' and clinicians' needs. Essentially very similar to Teletrials but there are not enough published examples yet to determine fixed models.
A fully virtual clinical trial is one that is completely technology-based and can include those run by registry searches and data mining. That means there are no traditional sites, no physical locations used, and no face-to-face interactions. Actual participants may be involved but their interaction is all via web sites, phones, apps, watches, and e-diaries.
National teletrials compendium: https://www.health.gov.au/resources/collections/the-national-teletrials-compendium
Queensland Health teletrials information page: https://www.health.qld.gov.au/hiiro/html/teletrials
Medicines Australia Teletrials Resource page: https://www.medicinesaustralia.com.au/policy/clinical-trials/tele-trials/