between mobile switching centre and PSTN, which is a A network. However: it is at the POI (point of interconnection) that the GMSC of the mobile network of UASL gets interconnected to the GMSC of BSNL by a facility of the interconnection seeker (which in this case happens to be Reliance). Broadly speaking, we have two types of POI, namely, international and local POI. B Under the Agreement, UASL agrees to ensure that its interconnect facilities delivered at each POI conforms to the specified standards for interconnection and that UASL shall be responsible to provide, install, test, etc. all such interconnection facilities on its side of POI. Therefore, every POI has two sides. c Eg. in our case, one side of POI is that of BSNL and the other side is that of Reliance. The Calling Line Identification (CLI) means information generated by the network capability which identifies and forwards the calling number through the interconnected BSNL's network. Under clause 2.1.13, Trunk D Group is a part of POI. One must keep in mind that the above aspects are not only technological, they are maintained for billing and accounting purposes. They generate data(s) in the form of CDRs and billing records in detail at the International Gateway Exchange of ILDO (International POI), at the NLDO Trunk Automatic Exchange of NLDO (National POI) and Local E Telephone Exchange of BSO (Local POI for our understanding). At each stage, the billing record is generated so that if an UASL is riding on the network of BSNL, the former has to pay for the incoming international call in terms of duration, etc. and even in the case of local calls or national calls which includes the F distance parameter. Under clause 2.1.13, the fully mobile, limited mobile and fixed services network of UASL shall be having separate POis with BSNL, which shall be treated separately for set up costs, port charges, etc. Under clause 2.1.15.3.3, for the purpose of international call the UASL shall G handover the .call to BSNL at the originating Long Di,stance Charging Centre (i.e. LDCC TAX). Lastly, under clause 6.4.7, all the requ!ri:;id information shall be submitted in the rorm of monthly r:;emficate as prescribed in Schedule I s'all be submitted to BSNL by UASL. It will indicate details of thr traffic H