Are there any limit of PIN set in DISA?

I use FreePBX to do my DISA programming. I need to assign more than 10 PIN for the DISA. It seems to me that the DISA only accept 10 or less pin. Now I need to manually add the extra PIN in the DISA config file. Does anyone knows it is a limitation of FreePBX or there is other some problems in my system?

I never tried more than 10, so if you get confirmation from elsewhere that it is stuck at 10 then feel free to file a bug.

I restore my system once, so I’m not sure whether it is due to the restore or not. Everything else seems working fine. Does anyone else has set up a DISA with more than 10 PINs and successful?