[Asterisk-Users] Calling Card Application

[KH Chow]

Hi there,   Regarding the calling card system, I would like to know what software tools are suitable to write the CDR system? 1)      Perl (but what kind of database should be used?) 2)      PHP + MySQL 3)      or others suggestion?   Also, which one is easier to access AGI? Any source and information would be appreciated.   Best regards, Max Chow