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3CX Phone System for Windows System for Windows
Page 41
8. Adding Direct numbers using DID/DDI lines
Introduction
Many companies provide users and/or departments with “Direct or DID numbers”, which
allow their contacts to call them directly, bypassing the receptionist. DID numbers are
referred to as DDI numbers in the United Kingdom and as MSN numbers in Germany.
Even if you have a digital receptionist, a direct line / number is often preferable because
it’s more convenient for the caller.
Direct numbers can be easily implemented using DID numbers. DID numbers are
provided by your VOIP provider or Phone Company and are virtual numbers assigned to
your physical lines. Usually you are assigned a range of numbers, which is linked to an
existing BRI/T1/E1. There will be an extra charge per number or per range, but this will be
a fraction of the cost of adding physical lines. VOIP providers also provide DID lines.
Enquire with your Phone Company or VOIP provider for more information.
DID numbers and 3CX Phone System – How it works
DID numbers “play well” with 3CX Phone System, or indeed with any SIP based IP PBX.
Acting according to the SIP standard, 3CX Phone System expects the DID number, i.e.
the intended destination, to be in the To: field of the SIP invite request. Most VOIP
providers and VOIP Gateways will do this by default.
If your VOIP Provider and VOIP Gateway do this by default, all you need to do in the 3CX
Management Console is setup a DID Line (which is akin to an inbound rule) to configure
calls made to that particular DID number to go to a particular extension, digital
receptionist or other destination.
Adding a DID line
To add a DID line to 3CX phone System;
1. In the 3CX Phone Management console click on the ‘Add DID’ link in the left hand
menu. The ‘DID/DDI configuration’ screen appears.