The Competition Appeal Tribunal (CAT) has by BT over proposed price controls to the Competition Commission (CC).

BT is challenging regulator Ofcom over the prices it will allow its BT Openreach division to charge other telcos for access to its infrastructure, to deliver their own services to customers.

Joining the fray are Sky, TalkTalk and Everything Everywhere which consists of the T-Mobile and Orange brands. All these companies have lodged their own appeals on the pricing formula.

The price controls relate to wholesale charges for telephone and broadband services delivered to homes and businesses over BT's copper network under the local loop unbundling and wholesale line rental regimes.

The charges were expected to cover the period 2012-2014 and were announced by Ofcom in March 2012.