Direct Dialling Inwards

Direct Dialling Inwards

Many companies already have a phone system (PBX) where each extension can be dialled directly from outside the company, rather than having to go via the switchboard. The technology behind this is called Direct Dialling Inwards (DDI or DID in the USA), and it is as applicable to fax, data and video conferencing as it is to voice calls.

This is the most direct of the inward routing methods. Each user is given their own telephone and /or fax number rather than a separate line. Voice calls, data calls, video conferencing and fax calls sent to that number are routed directly to the user. A difficult concept for some people to understand is that ISDN allows infinite telephone numbers whilst only renting a small quantity of channels (lines). For example it is possible to have say two telephone channels (lines), but with multiple incoming telephone numbers.

DDI means that the number dialled is transmitted as well as the number of the calling party. This has powerful marketing analysis capabilities. For example ISDN users who have enabled DDI will have been allocated a DDI number range of at least 10 numbers by BT. The company will then allocate one (or more) of these as their main telephone number. Other numbers can be allocated to telephone devices such as fax machines, credit card machines etc reducing costs on line rental.

Using a different DDI number for each advertisement being placed is an easy way to monitor exactly which adverts are producing the best response

If you have Call Management Software the data is captured to a computer system for even greater analysis.

You can also use DDI numbers to remove the need for extra lines if you wish to answer in a different company name.



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