General Features
Features Guide 177
Programming Guide References
• 2.3 Numbering Plan
– CallWaitingSet/Cancel
• 2.4 Class of Service (COS)
– Off-Hook Call Announcement (OHCA)
•2.8SystemOption
– Whisper OHCA to extensions other than T74XX
Features Guide References
1.6 Originating Features
• Busy Station Signaling (BSS)
• Off-Hook Call Announcement (OHCA)
1.9 Answering Features
•CallWaiting
User Manual References
• 4.3.17 Call Waiting
• 4.3.50 Off-Hook Call Announcement (OHCA) —Whisper
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