[VOIPSEC] RE: Call Detail Records for VOIP Calls

[Mark Teicher]

Has anyone dealt with configuration of Call Detail Records for VOIP calls?
What is the logging requirements for Sarbanes-Oxley regarding how CDR records are to be kept and what format?? 
Can call detail records be split into incoming and outgoing calls based on trunk groups routing voice traffic and then re-assembled for investigative reasons?
What about parsing through call detail records for unusual calling patterns or duration based calls ??