Look up: ddI

1. DDI
   Device Driver Interface + Digital Document Interchange + Direct Dial In
   Found on http://www.encyclo.co.uk/visitor-contrib
   
   
2. DDI
   Direct Dialing In - to a building so everyone has a number which is directly dial-able from the PSTN (public network). As opposed to use of a human switchboard operator (`Good morning, this is Flying Boat Mobile Communications, how may I direct your call?`) or a DTMF controlled extension access facility (as in `if you know the extension you require, please dial it now`). DDI is only feasible where the number space is large; one of the reasons for dialing code changes (of which there have been several in the UK in recent years).
   Found on http://www.encyclo.co.uk/visitor-contrib
   
   
3. DDI
   Direct Dialling Inwards. Enables some digital switches to receive dialled numbers directly from the trunk interface.
   Found on http://www.encyclo.co.uk/visitor-contrib
   
   
4. DDI
   Direct Dialling In (DDI) is the provision of a block of telephone numbers for receiving calls into a company's private branch exchange (PBX) system. Using DDI, a company can offer its customers individual phone numbers for each employee or company workstation without requiring a physical line into the PBX for each connection.
   Found on http://www.encyclo.co.uk/local/20632
   
   
5. DDI
   Digital Display Indicator
   Found on http://www.encyclo.co.uk/visitor-contrib
   
   
6. DDI
   Public network subscriber`s access to an extension of a private exchange by simply dialling a normal-length telephone number. (PH/PTIH) Category: Management in the public and private sector • a procedure when a public-exchange subscriber,or operator,after having dialled the PABX director...
   Found on http://www.mijnwoordenboek.nl/definition
   
   
7. ddI
   ddI and ddC:see AZT.
   Found on http://www.infoplease.com/ce6/sci/A09124
   
   
8. DDI
   Direct Dial Inward
   Found on http://www.met.police.uk/foi/glossary.ht