[Asterisk-Users] query about Three way calling

[himanshu at tataelxsi.co.in]

Hi all
 I am a new user of asterisk and want to implement three way
calling but not getting any information about how to configure
asterisk conf file, Dial Plan etc..
 whether a Digium card is essential or not?
 Is Three way calling is same as MeetMe or separate feature in
asterisk?
Can You please send me some Document or link where
i can get all relevant information.

thanks in advance
himanshu
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