Well there are three major Telco's in India at the moment who offer PRI to subscribers
Thus if you were to terminate them on to your cisco router , you shall need to know one very important parameter.
The FRAMING
So here they are
TATA : crc4
RIC: crc4
BSNL/BBNL/MTNL: no-crc4
So your config for the E1 controller would look like for a BSNL/BBNL/MTNL PRI circuit
isdn switch-type primary-net5
controller E1 2/0
pri-group timeslots 1-31
framing no-crc4
no shut
description : ISDN PRI (XXXXXX)
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