Features & benefits of ISDN2e explained

What BT Call Features are available with ISDN2e?

There are a range of BT Digital Calling Features (formerly known as Digital Select Services). These include Call Forwarding, Call Barring and Calling Line Identity (CLI). Additional features include Customer Controlled Voice and Data Call Forwarding, Call Waiting and Call Hold, and Call Deflection.

Most BT Digital Calling Features are controlled by your equipment. They do not use pre-set codes such as 1471. You should check with your supplier that your equipment is compatible. To order BT Call Features go to our sales pages, where you'll find our contact information.

Please note: The BT Calling Features available with analogue lines, such as Call Sign, Call Minder and Call Diversion, cannot be used with ISDN2e – neither can the BT Answer Service.

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Can I keep my outgoing number private?

Yes, you can request that your CLI is revealed to no-one. This service is available free of charge by adding Calling Line Identification Restriction (CLIR) to your ISDN service via Business Sales on 0800 800 152.

If you do have CLIR added to your line you can release your CLI information on a call-by-call basis by dialling ‘1470’ before the outgoing number.

Similarly, if you do not wish to have CLIR permanently added to your line, you can prevent your CLI from being released on a call-by-call basis by dialling ‘141’ before the outgoing number.

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I used to have Caller ID. Is this service available on ISDN2e?

The ISDN equivalent to Caller ID is Calling Line Identity Presentation (CLIP). To order, go to our sales pages where you'll find our contact information. Although this is an exchange-provided service you do need to ensure that your PBX or switch supports it.

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How can I divert an individual DDI number on my ISDN2e line?

You can use Customer Controlled Call Deflection (CCCD) to divert calls to individual DDI numbers. This is mostly equipment-based but must first be enabled on the line. Each call is offered to your equipment individually. You then choose to answer the call or deflect it to a specific number. You will be charged for the diverted leg of the call. In order to control the call deflection service, you need a suitable PBX or switch. To order CCCD, go to our sales pages where you'll find our contact information.

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What call-barring options are available?

There are several types of call barring available:

  • Admin provided Permanent Incoming Call Barring (ICB)
    This enables customers to have outgoing-only lines. All incoming calls are barred. Permanent ICB applies to both voice and data calls on all bearer services.
  • Admin provided Permanent Outgoing Call Barring (OCB)
    This enables customers to have incoming-only lines. No calls can be made from lines with Permanent OCB.
  • Admin provided Selective OCB
    This enables customers to bar certain categories of outgoing calls. These categories are:

    • All calls (except 999 and 150, 151, 152 154 and 0800)*
    • International and Premium Rate Services
    • All Operator calls (except 999 and 150, 151, 152 154 and 0800)*
    • National, International and Premium Rate Calls (except 999 and 144, 150, 151, 152 154 and 0800)*
    • International, Operator and Premium Rate Services

* Indirect Access codes are not accepted from the calls barred in this option. Calls prefixed with an indirect access code will not connect.

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How do I view the phone number of the person I'm talking to at all times?

You need Connected Line Identity Presentation (COLP). This allows you to view the number to which your outbound call has been connected. This may not necessarily be the number that you first dialled.

The service is not available when calling PSTN, ISDN2 (DASS), ISDN30 (DASS) or ISDN30e (I421) lines or when the called party has restricted access to their line identity using the COLR service. You will also need to have terminal equipment that supports it. You will see only the number of your outbound call when the call is connected.

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Is Malicious Call Indication (MCID) available?

Yes, in certain circumstances, at customer request. This is most likely when there have been instances of malicious calls and the Police are involved.

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Can I have Ceased Number Intercept (CNI) on ISDN2e?

Ceased Number Intercept can be applied to ceased circuits only. It can be applied to:

  • ISDN2e on System Access, Point to Point:

    • The main directory number of the circuit
    • A DDI range
    • Part of a DDI range. This can be any part as long as it is in a block of 10 DDIs. As this is expensive, you would normally have just the CNI on the whole DDI range.

    Please note:
    You can have a different CNI on each of the DDI ranges and on a different one for the main number. You can decide to have a different CNI on different blocks of 10 DDIs from a range, even if the blocks are from within the same DDI range. However, both options are expensive.
  • ISDN2e on Standard Access, Point to Multi Point:

    • The main directory number of the circuit
    • Each MSN - each one is treated as a separate number, so you can have a different CNI for each MSN number.
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I need to send some alphanumeric characters down the ISDN line, along with the number that I am dialling. Can I do this?

Yes, this is known as sub-addressing. It can be used for calls between ISDN circuits. Sub-addressing allows you to send up to 20 alphanumeric characters (apart from the # symbol) when making a call. ISDN users can allocate different combinations of characters to each device connected to their line, in a similar way to Multiple Subscriber Numbering (MSN). Incoming calls that include the sub-address then go to a precise destination. This might be a device connected to a LAN, individual devices connected to an ISDN2e line, or an application on a host computer.

Before using this service you should check that your terminal equipment can send and/or receive sub addresses. Sub-addressing cannot be used on calls to the PSTN or on International Speech calls. The type and location of the call parties determine the maximum number of sub-address characters that can be used.

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Can I use my line for video-conferencing?

Yes, ISDN2e lines can carry data calls including digital video-conferencing. You can make data calls using a single channel or both channels. If you have a multiple ISDN2e installation, you can use multiple channels (2, 4, 6, 8, etc).

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I have an old ISDN2 circuit and my PBX maintainer has asked me to upgrade it to ISDN2e. What is the process and how much does it cost?

It is important to check with your switch maintainer before changing from ISDN2 to ISDN2e, especially if you use DDI. ISDN2 supports point-to-multi-point working only. If you upgrade to ISDN2e with DDI, your equipment must be reconfigured from point-to-multi-point to point-to-point.

To arrange an upgrade or to find out the cost, go to our sales pages where you'll find our contact information.

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