[Asterisk-Users] SIP exten to PSTN calls

[Appan KH]

Hi,
I had configured Asterisk with the following
1). X100P - Card
2). Two -Greadstream100 SIP Phones.
I am able to make calls from SIP Ext to SIP Ext and PSTN calls from outside 
to SIP Extn.
But I am not able to make calls from SIP Extn to PSTN out going calls-it 
gives BT error message- The number you had dialled not recognised.
The SIP extn is not sending the correct number.
I will be thank full if some solutions is suggested.

appan kh