https://www.epo.org/en/service-support/faq/law-practice/oral-proceedings-held-videoconference/conduct-oral-proceedings/are

Are there any restrictions regarding the physical location of the applicants/parties when they connect to a VICO?

The EPC does not require the applicant/parties to the proceedings to be physically in one of the member states in order to participate in oral proceedings by VICO.