Callerid unknown - asterisk with digium card - locationINDIA

Hi guys,
I am a windows guy psst…[sorry, to hang around here, i am not as clean as Linux guys are ] :smile: ; well it happened that i had to do a setup of the asterisk in a linux machine, and i did it easily with the help of docs; and it’s working well with a simple dialplan; my problem is , that it always returns the callerid as unknown - the server machine that i am using is in India, and we are using a couple of providers here including Bharti [Airtel], Reliance, and BSNL.

can somebody help me; i am too naive here…