do not disturb (DND)

A feature of voice telecommunications systems that enables end users to busy

out a station and reject incoming calls by depressing a feature button or soft key, or entering a code via the telephone keypad. Once the station is busied out, incoming calls typically are automatically forwarded to another station, the system attendant, or perhaps voice mail.

• BECN (Backward Explicit Congestion Notification)
• beeper
• bel (B)
• Bell, Alexander Graham (1847–1922)
• Bell Communications Research (Bellcore)
• Bellcore (Bell Communications Research)
• Bell Labs (AT&T Bell Telephone Laboratories)
• Bell Operating Company (BOC)
• Bell System
• Bell System
• Bell System
• Bell Telephone Laboratories (Bell Labs)
• bend diameter
• bending loss
• bend radius
• bent pipe
• BER (Bit Error Rate)
• Berkeley Internet Name Daemon (BIND)
• Berners-Lee, Sir Timothy (“Tim”) John (1955–)
• best effort
• best-effort ATM
• beta
• B Excess Burst Size
• BFT (Binary File Transfer)
• BGP (Border Gateway Protocol)