What is Direct Inward Dialing DID Number or DDI Number

 Direct Inward Dialing  DID  Number  is a feature offered by telephone companies in order to serve the needs of their customers via PBX (Private Branch Exchange) systems. In practical terms, a DID number (also called a DDI in Europe and sometimes referred to as a virtual number) is a local telephone number in a selected country or city. These numbers are then forwarded by DID World Wide to PSTN (Plain Old Telephone System – a regular telephone), Voice over IP (VoIP), SIP, H.323, IAX, Skype, or Google Talk anywhere in the world.
Typically a DID is used to provide local telephone numbers for customers on a worldwide basis, or to provide access from regular telephones to non-PSTN destinations such as VoIP.
VoIP DID numbers are usually used to decrease the cost of domestic and international phone calls, show local presence in different cities and countries, unite all overseas offices, attract more customers from local markets,For example, you buy USA DID number and forward incoming calls from it to your UK landline or mobile number. The customers will pay local rates for phone calls to DID phone numbers in their location and consider that you are located in the USA.

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Unknown on October 8, 2012 at 6:24 AM said...


You may also check this video on Direct Inward Dialing (DID). It is based on Ozeki Phone System XE and it fairly explains DID and VoIP:


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