Load Balancing ATM Switching System with SNAT Mode

Dear DC,

I got an inquiry from my client that they asking for a real IP of ATM machine which requested to their switching system. As currently we are implemented F5 in SNAT mode. So anyone experience on load balancing on ATM switch? And how can we get the real IP after SNAT on F5? Or can we use iRule same as XFF on http traffic? Or do we need static NAT or something else on network site?

-Switching system using TCP-7000 and TCP-7100

Thank you!!