This attribute indicates if the component provisioned is a calling or
called end. If the value is master, the Dlci Siwf Spvc component is
provisioned as a calling end and is responsible for originating the
call to set up the ATM VCC. If the value is slave, this Dlci Siwf
component is provisioned as a called end and is responsible for
terminating call setup requests from the remote end. This attribute is
not displayed for NPVCs.