Direct Dial In (DDI) with ISDN30/30e
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Your guide to ISDN30 and ISDN30e
Find out what ISDN30/30e is and compare them. Discover how long it’ll take to install a new ISDN30 service and what devices you can use.
What do I get with ISDN30e (ETSI)?
Help with BT Business services including broadband, phone lines, systems, mobile, hosting, email, and billing.
How do I use Direct Dial In (DDI) numbers with ISDN30/30e?
Discover (DDI) Direct Dial In on an ISDN30/30e system. Learn how to use, present a DDI on outgoing (CLI) Caller Line Identity, purchase additional and more.