2.8 [2] SystemPC Programming Manual 153For more information on flexible numbering, see "1.6.4 Flexible Numbering/Fixed Numbering" in theFeature Manual.BSS / DND OverrideSpecifies the feature number used to notify a busy extension of a second call by Call Waiting, or callan extension in DND mode.Default1Value Range1 digit (0–9, *, or #)Maintenance Console Location2.8.10 [2-6-3] Numbering Plan—B/NA DND Call FeatureProgramming Manual References2.10.1 [4-1-1] Wired Extension—Extension Settings—Option 2—Manual C. Waiting for ExtensionCall2.10.8 [4-2-1] Portable Station—Extension Settings—Option 2—Manual C. Waiting for Extension CallFeature Manual References1.3.9 Call Waiting Tone1.4.8 DND (Do Not Disturb)Executive Busy OverrideSpecifies the feature number used to interrupt an existing call to establish a three-party conferencecall.Default3Value Range1 digit (0–9, *, or #)Maintenance Console Location2.8.10 [2-6-3] Numbering Plan—B/NA DND Call FeatureProgramming Manual References2.8.11 [2-7-1] Class of Service—COS Settings—Extension Feature—Executive Busy Override2.10.1 [4-1-1] Wired Extension—Extension Settings—Option 3—Executive Override Deny2.10.8 [4-2-1] Portable Station—Extension Settings—Option 3—Executive Override DenyFeature Manual References1.5.3 Executive Busy Override