Digital Dual Parenting allows On-Net traffic to an Embark Digital Site, including Featureline Corporate, (PBX or Retail Connection), to be split between two discrete Embark, including Featureline Corporate answering points. (PBX or Retail Connection site) which gives automatic resilience for On-Net traffic to Business Critical Embark and Featureline Corporate Digital Sites (PBX or Retail Connection), in the event of a disaster or major fault.

The split of On-Net call traffic will be 50/50 when both Digital Sites (PBX or Retail Connection) are in operation.

The following charges are in addition to the full connection and rental charges (both line and site charges) for BT's Standard Embark Digital and Featureline Corporate Digital Access Lines.

If any additional infrastructure is used to provide the Embark Digital or Featureline Corporate Digital Access Lines, BT's standard excess charges shown in Section 45 Part 1 will apply.

For any reconfiguration to the Customer Embark or Featureline Corporate Digital network, Timescale charges shown in Section 15 Part 8 will apply.

Site Assurance enables Customers to call BT and have their In-Coming PSTN calls that go to an Embark Digital or Featurenet Corporate Digital Site, re-routed to an alternative pre-set Embark or Featurenet Corporate Site (Centrex or Digital), or any pre-set designated telephone number in the event of a major fault or disaster. This will be achieved by the use of basic call diversion to reroute all Incoming PSTN calls.

NB. This charge must be applied to all Digital Access Lines that exist at the Embark or Featureline Corporate Digital Site. In addition call charges will be raised for the diverted part of each call when the diversion is activated.

The above rental charges for Digital Site Assurance do not apply on Embark if a Customer takes Embark call pricing scheme C, however the additional call charges for the diverted part of each call when the diversion is activated will still apply. NB: This does not apply to Networks made up of Featureline Corporate Access Lines.

This service option has a minimum rental period of 12 months and is subject to survey.

Any changes to the preset destination number after the service is provided will be charged using timescale rates shown in Section 15 Part 8

The following additional features are also available on Embark Centrex Access Lines and Featureline Corporate Centrex Access Lines. The charges identified are in addition to normal connection and rental charges.

Where Customers are already paying for the facilities identified below, on ordinary BT Direct Exchange Lines or BT Featurelines that are converted to Embark Centrex or Featureline Corporate Centrex Access Lines, the set-up charges shall not apply.

Facility set-up charges will be incurred for Reminder Call - see Section 2 Part 4Subpart 3.

The customer is entitled to one free Full user guide per line. Each additional user guide is chargeable thereafter.