DDI

DDI/DID routing

Many companies already have a phone system (PBX) where each extension can be dialed 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), and is as applicable to fax as it is to voice calls.

This is the most direct of the inward routing methods. Each user is given their own fax number – not a separate fax line, just their own number. Faxes sent to that number are routed directly to the user. Groups of users can also be allocated a DDI/DID number giving Departmental DID routing capabilities.

The number of fax numbers allocated is independent of the number of fax lines on your Zetafax system – all you do is define a table of fax numbers, giving the Zetafax user account corresponding to each one.

If your phone system supports DDI for telephone calls already, it can be configured simply to allow DDI for fax. If you do not already have DDI you can install a separate digital telephone line (ISDN) to support it just for fax.