Done CDR billing in detail , know all in detail also done CISCO CDR billing , Done all in detial , I have done that for more then 4+ years , have algorithms understood , Done lot of reporting from many years and assure i will be one of right choice for you because i work with asterisk , AGI ,AMI and also Mysql Reproting .I done 5+ years job in call center .
Please open PMB so that we will discuss it in detail.
With Regards