| N/A | The Cisco Unified Border Element (CUBE) is a session border controller, which provides session control, security, interworking, and demarcation. CUBE is a software product available for licensing on the Cisco IOS® and Cisco IOS XE Software which runs on Cisco enterprise routers, but is also available for licensing as a software load for a virtual container. | N/A |
| N/A | Asterisk is an open source toolkit for building communications applications, now owned and supported by Sangoma (acquired with Digium in 2018). Most Asterisk-based systems and solutions require additional components (e.g. IP-phones, VoIP gateways or telephony interface cards, and other hardware), and expertise. | N/A |