503 ddi - Electronic Meaning Or Acronym for ddi

Meaning and Definition for ddi


Presenting information and knowledge about ddi!
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Direct Dialling In.
This allows an extension line on a PBX to be called directly from the public network without operator intervention (i.e. direct lines).

Another definition of ddi:
Direct dialling in (DDI)
Allows external callers into a PABX to dial directly to the required extension without going through a switchboard operator.

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