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IDN
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Supplementary ISDN Services - narrow band

• Multiple number subscriber.
• Presentation of the calling subscriber's identification.
• Restriction on presentation of the calling subscriber's identification.
• Presentation of the connected line's identification.
• Restriction on presentation of the connected line's identification.
• Prank call identification.
• Terminal under-addressing.
• Unconditional rerouting of calls.
• Rerouting of calls in the case of no answer.
• Rerouting of calls in the case of busy.
• Call on wait.
• Call retention.
• Terminal probability.
• Closed group of users.
• User-to-user signaling.