asterisk users - Dec 2010 - Prepaid Billing for Asterisk and Gnugk

Hi All;

A2Billing is working fine for Asterisk, but in case I need to use Asterisk and
Gnugk and I need to manage the accounts and the billing from one Database and
one billing system, so I need a prepaid billing that can work with both.

Which prepaid billing (open source) can be used to work with Asterisk and Gnugk?

Regards
Bilal