The petitioners are interrelated Companies, whom we would hereinafter refer to as M/s TTL. They have in this petition filed on 3/5/2005, challenged the action of M/s Bharat Sanchar Nigam Limited (BSNL) whereby the Fixed Wireless Phones of the Petitioners, branded as ‘WALKY’, have been treated as Limited Mobility Phones or WLL(M) phones. BSNL has by its impugned letter dated 14/01/2005, addressed to the Petitioners, with copies marked to all the heads of its field units (known as Circle heads), informed them of this reclassification and has demanded increased Interconnection Usage Charges (IUC) /Access Deficit Charges (ADC) on telephone traffic to and from these Fixed Wireless Phone (FWPs) for the period from 14/11/2004 to 13/01/2005. The petitioners have been asked to pay the additional amounts immediately on receipt of the said letter. Further the petitioners were asked to stop the operation of the WALKY service using numbering levels of fixed services without paying the IUC charges, including ADC, applicable to Limited Mobility Services as this was contrary to the terms of the license, the IUC Regulations and also the agreed terms and conditions of the Interconnection agreement. BSNL has also asked for the details of such amounts to be paid by M/s TTL to BSNL.