Integrated Extension Call can be delivered in three ways:

Indirect Access (IDA)

You add a rule to your Private Branch Exchange to add a carrier prefix to all mobile calls. These are then routed by the local BT exchange to T-Mobile. These will be onward routed to other networks as well as T-Mobile users at reduced costs. So fixed-mobile calls no longer appear on the bill from your fixed-line provider, instead they appear on your T-Mobile bill at greatly reduced rates.

Virtual Private Wire (VPW)

Calls to your own fleet of mobiles are made using a short-code from your desk phones, for example 7-1234. You add a rule to your Private Branch Exchange to convert these to freephone numbers ( for example 0808 125 1234 ) which then go to T-Mobile. We then route these to the correct mobile, based on a list of mobile numbers and their corresponding short-codes. So calls to your own fleet of mobiles no longer appear on the bill from your fixed-line provider, instead they appear on your T-Mobile bill at greatly reduced rates.

Fixed Private Wire ( FPW )

In this version your Private Branch Exchange is directly connected to the T-Mobile Intelligent Network through a private leased line from a provider such as Virgin, COLT or BT. Calls to all mobiles can be routed down this link and will be onward routed to other networks as well as T-Mobile users at reduced costs.

NOTE: this solution will require installation on site and has a rental cost.

All three versions of the IEC service will support short-code dialling plans so that a similar number pattern may be used to reach a person's desk phone or their mobile, regardless of whether the call is placed from a fixed extension or an on-account mobile.

The IEC service will also:

• Allow the integration of multiple sites and PBXs into a single dial plan
• Up to 5 digit extension numbers
• A short-code prefix of between 1 and 3 digits
• Prefixes can be used to determine different calling groups ( e.g. finance - 6xxxx, sales - 8xxxx, head office -1xxxx ).

Compatibility

Any programmable Private Branch Exchange (PBX) that supports number translation rules ( i.e. 7-1234 -> 0808 125 1234) can be configured with the IEC VPW and IDA services. For the FPW service, the customer's PBX must have a suitable ISDN PRI card to support the Q931 signalling protocol

Integrated Extension Call is a voice-based service only . It is only available to accounts with 20 or more mobiles through our direct sales force