Not working FXS Sangoma Card

i have At200 2 FXO/FXS installing asterisk 1.8.7 on centos 6.2.
i have configure analog card successfully.

ivr*CLI> dahdi show channels
Chan Extension Context Language MOH Interpret Blocked State
pseudo default default In Service
1 from-internal default In Service
2 from-internal default In Service
3 from-zaptel default In Service
4 from-zaptel default In Service

I have successfully checked incoming and outgoing on FXO means channel 3 and 4 (FXO) check both line from PBX also checked Telco direct line.

but when i try to make an incoming and outgoing on channel 1 and 2 (FXS) i have not getting any response on asterisk console

please help me what would i do need o check cable pain or what?