Users can transfer a call in progress to either an internal extension or an external public number. The system places the caller on hold while it performs the transfer.
If the transferring user hangs up before the destination user answers, the system automatically transfers the call, called an unsupervised or blind transfer. Alternatively, a user can wait for the destination to be answered and announce the transfer before hanging up to complete the transfer, called a supervised transfer.
Unless restricted by the administrator, the system does not differentiate between internal or external call transfers.