session border controller (SBC) → ελεγκτής συνόρων περιόδου σύνδεσης, ελεγκτής συνόρων συνόδου, ελεγκτής συνόρων συνεδρίας, συνοριακός ελεγκτής συνόδου
A session border controller (SBC) is a network element deployed to protect SIP based voice over Internet Protocol (VoIP) networks.
Early deployments of SBCs were focused on the borders between two service provider networks in a peering environment. This role has now expanded to include significant deployments between a service provider's access network and a backbone network to provide service to residential and/or enterprise customers.
Session border controller - Wikipedia