With twinning, you can choose to have all calls that are directed to your extension ring an additional number, which can be either an internal extension or an outdial number such as a cell phone. When you receive a call twinned in this fashion, you’ll be prompted to “press 1” to accept the call. If you don’t answer the call, the caller is returned to your voice mailbox on the ESI system. If you’re on a twinned call and need to transfer the call back to the ESI system, just press *4 and you’ll be given internal dial tone; then enter the extension number of the person you want to reach and press #. If you need to retrieve the call, just press ** and you’ll be reconnected.