Local number portability
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What links here
Vertical service code
5-1-1
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VSC
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Ringback number
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Call waiting
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Call forwarding
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Toll-free telephone number
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411 (telephone number)
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Telephone keypad
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North American Numbering Plan
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Asterisk
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Remote call forwarding
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Automatic callback
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DTMF signaling
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Automatic number announcement circuit
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Custom local area signaling service
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Calling feature
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