A media gateway is any device, such as a circuit switch, IP gateway, or channel bank that converts data from the format required for one type of network to the format required for another.
Message Session Relay Protocol (MSRP) is a protocol for exchanging a series of related instant messages across an IP network in the context of a session.
Microsoft Teams is a chat-based collaboration tool that is part of the Office 365 suite of services. Teams enables local and remote co-workers to work together in real and near-real time. It provides customizable workspaces and guest access to facilitate business-to-business (B2B) project management.