You can use the Busy Lamp Field feature to monitor the status of single-line sets, single-member lines, key system lines, multicall broadcast groups, and Hot Desk users. You can add a Programmable Key Module to an IP Phone or SUPERSET telephone to obtain additional BLF indicators. Users can program a busy lamp host set to give a single audible ring when a lamp first indicates ringing state (see Direct Station Select/Busy Lamp Field Programming for more information).
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Busy Lamp Indications |
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Busy Lamp Appearance |
Meaning |
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OFF |
Idle / Hot Desk user logged out (see Note below) |
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ON |
Busy |
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Alternating: 50% OFF, 50% ON |
Ringing (Idle or DND) |
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Alternating 20% OFF, 80% ON |
DND (Idle or Busy) |
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Fast Alternating 150 mS OFF, 150 mS ON |
Call Forward Always active |
Note: A logged out Hot Desk user is indicated by the lamp extinguishing. On the 5550 IP console, the BLF icons will show Hot Desk as logged out.
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Busy Lamp Indications by Monitored Device or Group |
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Device or Group Type |
Call Status |
Busy Lamp Indication |
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Single Line or Key System Prime/Non-Prime Broadcast Groups Mixed Key System Group (Station Follows Call State) Stations |
Idle |
Idle |
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Ringing |
Ringing | |
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Busy |
Busy | |
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Call on Hard Hold |
Busy (idle for stations) | |
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Soft Held Call Recalling |
Ringing | |
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DND (All members of a Non Prime Key System) |
DND | |
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DND (Station or Prime Key System Broadcst Group) |
DND | |
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Call Forward Always active (Prime line) |
Call Forward Always active | |
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Hot Desk user logged out (Prime line only) |
Hot Desk user logged out | |
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Multicall Prime or Non Prime Broadcast Groups |
Two Idle |
Idle |
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Ringing and Idle |
Ringing | |
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Ringing and Busy |
Ringing | |
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Busy and Idle |
Idle | |
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Two Busy |
Busy | |
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Hard Held Call and Idle |
Idle | |
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Two Hard Held Calls |
Busy | |
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Hard Held Call Recalling |
Ringing | |
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Soft Held Call Recalling and Idle |
Idle | |
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Soft Held Call Recalling and New Call Ringing |
Ringing | |
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Two Soft Held Calls Recalling |
Busy | |
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All Members DND |
DND | |
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Mixed Multicall Group (Station Follows Call State) |
Idle |
Idle |
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Ringing and Idle |
Ringing | |
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Ringing and Busy |
Ringing | |
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Busy and Idle |
Idle | |
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Two Busy |
Busy | |
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Hard Held call at Station and Idle |
Idle | |
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Hard Held Call at Station and New Call Ringing |
Ringing | |
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Hard Held Call at Station and Busy |
Idle | |
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One or Two Hard Held Calls Recalling |
Ringing | |
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Soft Held Call Recalling and Idle |
Idle | |
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Soft Held Call Recalling and New Call Ringing |
Busy | |
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Soft Held Call Recalling and Busy |
Busy | |