Tellular GSM gate-->Audiocode FXS ---> Asterisk


I have the scanario like below:

Tellular GSM gate–>Audiocode FXS —> Asterisk Server
As my Tellular Gsm Gateway is connected at Audiocode FXS port through RJ-11 connector. and the Audio code is with Asterisk.
I want to dial from asterisk to Audiocode on the port where i have connected the Tellular device.but my Audio code is showing tha port status in OFFHOOK. it means i cant dial out through this port…
Is any body know how to configure and what i m missing?