h323 to sip call forward help

Dear friends,

I cant solve the problem with asterisk. I also installed a2billing to manage accounts.

My problem is this:

A quintum with PRI gets the calls from pstn line. It forwards the calls to my asterisk. I get it with h323 from asterisk but asterisk not supply dialtone. it gives auth-prepaid card failed.

I want to forward it to provider,which I connect with SIP, from my asterisk.

do you know how to configure extensions.conf, ooh323.conf, etc. ?

what I must do and configure?

anybody have any idea