Cannot call via zap-fxo

I have a problem. I have installed a card with 2fxo and 2 fxs. fxs work fine but not fxo…

It dials the correct number …but the phone does not ring!!!

#zaptel.conf
fxsks=1
fxsks=2
fxoks=3
fxoks=4

#zapata.conf
[channels]
language=en
context=from-zaptel
signalling=fxs_ks
rxwink=300 ; Atlas seems to use long (250ms) winks
;
; Whether or not to do distinctive ring detection on FXO lines
;
;usedistinctiveringdetection=yes

usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
busydetect=yes
busycount=12
;echocancel=yes
echocancelwhenbridged=no
;echotraining=800
rxgain=8.0
txgain=8.0
group=0
callgroup=1
pickupgroup=1
immediate=no

cat /proc/interrupts

       CPU0       CPU1

0: 6142849 0 IO-APIC-edge timer
1: 3 0 IO-APIC-edge i8042
2: 0 0 XT-PIC cascade
8: 6189687 0 IO-APIC-edge rtc
12: 4 0 IO-APIC-edge i8042
137: 33828 6035434 IO-APIC-level uhci_hcd:usb4, HDA Intel, Wildcard TDM410P
145: 732 445011 IO-APIC-level eth0, HFC-multi
153: 0 0 IO-APIC-level uhci_hcd:usb3
161: 4748 6967 IO-APIC-level uhci_hcd:usb2, libata
169: 1 0 IO-APIC-level uhci_hcd:usb1, ehci_hcd:usb5
NMI: 0 0
LOC: 5958752 5958772
ERR: 0
MIS: 0

Dial(“SIP/61-08cb21d0”, “ZAP/1/69xxxxxxxx|100|Tw”) in new stack
Called 1/69xxxxxxxx
Zap/1-1 answered SIP/61-08cb21d0
Hungup ‘Zap/1-1’ //i hang up the li ne

why does this happen?what have to do??

please…help!!!