asterisk users - Apr 2005 - OH323: Sending CallerID to H323 voip provider...

Hi,

I'm trying to make a OH323 call with Grandstream, Asterisk and H323 voip 
provider. Everything seems to work fine, except callerid is set to some 
value for all calls (10100), despite setcallerid statements in Asterisk.

Are there any special considerations or tricks to get this working ? I've 
contract that voip provider will accept custom CallerID....

Regards,

Rob.