>just what are the ways to check the CDR
Check therir presence, make sure number, date, time are right.
>and the status Report messages?
Check their presence on Gb-interface.
>what are the size of the packet, characters???
With 7bit encoding 1packet – about 140 chars.
With UCS2 encoding 1packet – about 64 chars.
See GSM 03.40 for details.