In an Avaya Aura® environment, you can use the Bridged Call Appearance feature through the Avaya Vantage™ built-in UC experience and the Avaya Connect Expansion Module application.
A bridged call appearance is an appearance of a primary phone number on a different extension. You can use the bridged call appearance to make and receive calls on behalf of the primary number owner. You can also join an ongoing call to or from the primary number.
For example, for extension A, as the primary number, to also have call appearances on extensions B, C, and D, you must use System Manager to access B, C, and D and bridge each of them to extension A. After you complete the required configurations, users of extensions B, C, and D can see the call appearance of extension A on their Avaya Vantage™ built-in UC experience.