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Direct Dial In (DDI) with ISDN30/30e | BT Business
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Direct Dial In (DDI) with ISDN30/30e

What are DDIs?

I want to present a DDI number on my outgoing CLI. How do I do this?

Where can I purchase additional DDIs?

I just had a new ISDN30/30e line installed and my PBX maintainer needs only 4 digits sent. How can I change this?

How do I use Direct Dial In (DDI) numbers with ISDN30/30e?

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