Asterisk: Zaptel and X100P Configuration problem

I am facing issue with X100P card installed on my system.

My current setup…

  • Configured zaptel on ubuntu box
  • Installed and configured Asterisk on Ubuntu box
  • Configured few extensions in SIP and IAX ( working good)
  • Installed X100P card on the system

With this setup on my system (running mode), as soon as I connect (using RJ11) the incoming phoneline(SBC) service connection to the “line” port in X100P, the call line(dial tone) is establised before I make the calls. After few mins, the line is engaged and then dead until I unplug the connection from X100P.
I was wondering how would I resolve this issue. Any help or inputs will be greatly appreciated.