ISDN2e call features in detail


How can I present a DDI number in place of my outgoing CLI?

There is not an exchange-provided service. You need a PBX or switch that enables you to allocate each DDI number to a phone extension, so that incoming calls to DDIs are routed appropriately and have a corresponding number presentation.

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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). This can be ordered from Business Sales on 0800 800 152. Although this is an exchange-provided service you do need to ensure that your PBX or switch supports it.

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What options do I have for forwarding calls made to my number?

There are two ways of implementing call forwarding on ISDN2e:

  • Admin Controlled Call Forwarding
    Admin Controlled Call Forwarding (ACCF) is an exchange-controlled call forwarding option. This means that it does not require special equipment. To set up this service call Business Sales on 0800 800 152. The service is active within 24 hours.
  • Customer Controlled Call Forwarding
    Customer Controlled Call Forwarding (CCCF) diverts calls to all numbers to a single number of your choosing. This call-forwarding option is applied by you by programming your equipment to divert the calls. This means it is exchange-independent. Contact your equipment manufacturers if you are unsure whether your equipment supports the service. To enable call forwarding on the line, ring Business Sales on 0800 800 152.

    Please note: The forwarded leg of the call is chargeable. The charges appear on your bill along with the subscription for the forwarding service.

    The following options are available for both Admin- and Customer-Controlled forwarding:
    • Call Forwarding Unconditional (CFU)
      All incoming calls are immediately forwarded to the nominated destination number.

    • Call Forwarding on No Reply (CFNR)
      All calls are forwarded to the nominated destination number if the call is not answered within approximately 20 seconds.

    • Call Forwarding on Busy (CFB)
      All calls are forwarded to the nominated destination number if the line is engaged.

  • Please note: If you have an ISDN2e line with MSNs present, the call forwarding is configurable on a per MSN basis. This is not possible with admin-provided call forwarding, and also not possible if you are using DDI numbering.
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What is the difference between Customer Controlled Call Forwarding (CCCF) and Admin Controlled Call Forwarding (ACCF)?

The two services do the same thing, by diverting all your numbers to a single number of your choosing. However, the way in which the divert is applied differs greatly:

  • ACCF requires a call to Business Sales on 0800 800 152 to specify the number to which you want all your calls diverted. Calls are diverted from the exchange and do not require you to have compatible equipment installed at your premises.
  • CCCF diverts all calls to a single number of your choosing. This again diverts calls from the exchange, but rather than having BT turn it on and off, you can control it from your equipment. This service has to be enabled on the line in order for your equipment to communicate with the exchange and divert the call. Prior to subscription to the service, check with your equipment manufacturers that the service is supported. To order CCCF, call Business Sales on 0800 800 152.
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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, call Business Sales on 0800 800 152.

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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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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 there a service available that prevents a caller from finding out the number to which they have connected?

Yes. This service is called Connected Line Identity Restriction (COLR). It is available free from Business Sales on 0800 800 152. Once provided, the line identity is restricted to all incoming calls. Activation/deactivation of this facility on an incoming call by call basis is not available. This service prevents the CLI being viewed by customers that use the Connected Line Presentation service or the Terminating Line Identity service.

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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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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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Can I have Remote Call Forward (RCF) on a ceased ISDN2e circuit?

Remote Call Forward can be applied to a ceased ISDN2e circuit on the main number, and on any single number DDIs. It cannot, however, be applied to any DDI range or part of a range, even if the main number is part of that range. One option is to have CNI on a DDI range. If the ISDN2e is on P-MP, then you can have RCF on each of the MSNs as well.

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