What resilience options are available?

Your ISDN30/30e connection can be delivered in a number of different ways to ensure that in the unlikely event of a failure, such as a JCB damaging your line, service impact is kept to a minimum.

Please note: Standard connection and rental charges apply for standby lines served from the same exchange as your primary site. If you require the standby lines to be serviced via a different exchange, out of area charges will apply in addition to connection and rental charges.

1. Back in Business - Single Site

  • calls are diverted to a BT Managed Call Centre
  • customer calls pre-allocated BT number to request service
  • suitable for customers with fewer than 30 channels.

2. Alternate Routing

ISDN30/30e can be routed via separate cables from the serving exchange. There are two options:
  • separate cables, same ducting
  • separate cables, separate ducting.

3. Diverse Routing

The service is provided via two different cables from two different serving exchanges. In the very unlikely event of a cable failure and a problem at the exchange, the chance of a complete loss of service is reduced. Separate DDI groups are served by the two exchanges.

4. Dual Parenting

The same DDI numbers are served from two different exchanges. This means that in the unlikely event of a problem with one of the exchanges, calls can still get through. Dual Parenting can be provided in one of two ways:

  • Option 1 uses two different exchanges and connects the ISDN 30 service via Diverse Routing.
  • Option 2 connects your site to the local exchange via two ISDN 30 bearers provided using the same duct and cabling. Once at that exchange, however, half the calls are diverted via the BT network to the next nearest exchange and alternative processor.

5. ISDN30/30e Site Assurance

Again, there are two possible options:

  • Option 1, 'Back in Business Multi-Site', uses Call Diversion for ISDN30 (DASS2) or Call Forwarding for ISDN30e services. Should a problem at your primary site occur, voice calls for ISDN30 (DASS2), and voice and data calls for ISDN30e, are diverted to a pre-arranged single number. On a request being received, the changeover to the standby site usually takes place within 30 minutes per bearer. You will be charged for the diverted leg of the call with this option.
  • Option 2 is delivered by providing a group of ISDN30 lines to your standby site. These lines are provided with a status of 'out of service'. If a problem occurs at your primary site, at your request, primary site lines are adjusted to 'out of service' mode and standby lines are brought into service. The back-up lines allow DDI, voice, and data calls for both ISDN30 (DASS2) and ISDN30e to be mapped across to your back-up site.

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