No voice when i pick up the call!

hello, asterisk users:
i set an environment to test the pbx. i call in from outside and direct to xlite, which is an extension sip 900. when i pick up the call, there is no voice in the xlite. telphone line is connected to port 3 and an analog phone is connected to port 1, and i also use an xlite as an ext
the zapata.conf:
[channels]
language=cn
switchtype=national
signalling=fxo_ks
context=druid-trunks-outbound
group=0
channel=>1-2
rxgain=8.0
txgain=4.0

signalling=fxs_ks
context=druid-trunks-inbound
channel=>3-4
rxgain=8.0
txgain=4.0
and zapatel.conf :
loadzone=cn
defaultzone=cn
fxoks=1-2
fxsks=3-4

is there anything wrong? please help me to figure out the issues!
thanks!
zhu8080

why don’t you fix your internal call issue before you start with external calls ? if X-lite isn’t getting audio on internal calls (see your other thread) what makes you think it’s going to work on external calls ?

hello, you are right. actually i just want to try different conditions and see how is the response. i will solve this issue first.
thanks!
zhulizhong