1.1 Incoming Call Features22 Feature GuideConditions• Internal Call Block also prohibits certain features, such as Walking Extension and Walking COS, frombeing performed between certain extensions.• Any extension can make an Operator Call regardless of the Internal Call Block setting of its COS. (→2.2.5 Operator Features)• Because each doorphone port is assigned a COS, the Internal Call Block feature can restrict certainextensions from calling certain doorphones. (→ 1.15.1 Doorphone Call)Feature Guide References2.2.1 Class of Service (COS)1.1.3 Incoming Call Indication Features1.1.3.1 Incoming Call Indication Features—OVERVIEWDescriptionExtension telephones can indicate an incoming call in various ways, described below.Indication Type Feature Description Details inRing Tone Ring TonePatternSelectionA telephone rings when receiving a call. Adifferent ring tone pattern can be assigned toeach incoming call type.• 1.1.3.2 RingTone PatternSelectionVoice-calling AlternateReceiving—Ring/VoiceProprietary telephone (PT) users can choosehow their telephones receive intercom calls, byselecting to hear ring tones or the caller's voice.• 1.5.3 IntercomCallLED LED Indication The LED indicator on a PT can indicate thestatus of different lines using light patterns andcolors.• 1.18.3 LEDIndicationCOS 1Extn. 100 Extn. 101COS 2Extn. 102 Extn. 103COS 3Extn. 104 Extn. 105 Extn. 106
