CID blocked!

Hi everybody!

Im meeting some problems with my a2billing system. I have asterisk and a2billing in the same box. I created a context for calls to pass through a2billing system. I created trunks and rates for all the calls that my PBX allows. I call from an extension to another Extension and it is all ok, just like it was brfore. When i call from that extension to an outside number (using PRI E1 or voicepulse) it doesnt show the CID on the remote party. It Shows the same number for all extensions which are calling outside. Thats a problem i need to solve it before setting the a2billing system in work. Can anyone help? ty