Hipath PRI

Hi

HiPath 3800 / HG1500 connected with Asterisk using SIP Trunking. integration is working fine both ways.

we are facing problem as we cannot able to dial outside using HiPath PRI line. when ever we tries to call from asterisk to outside it forward to operator.

is there any configuration need to be done so PRI line connected to HiPath can be used by Asterisk to do outgoing call.

Best Regards
Vipul