[Asterisk-Users] unable to create channel of type Zap

[Adnan Ahmed]

hi,
I am using TDM400 with FXS and FXO modules,everytime i try to make call 
of my analog phone it gives following errors:
Executing Dial("          ", "                                    ") in 
new stack
app_dial.c:554 dial_exec:Unable to create channel of type Zap Everyone 
is busy at this time.
I am new in this group and also asterisk too so don't bother with my 
questions!


my configs are:
zaptel.conf
fxoks=1
fxsks=4
loadzone=us
defaultzone=us

zapata.conf
[channels]
signalling=fxo_ks
context=outgoing
channel => 1

signalling=fxs_ks
context=incoming
channel => 4


extensions.conf
[incoming]
exten => s,1,Dial,Zap/1
;exten => s,1,Dial,Zap/4
in above two lines which one os appropriate i am trying both options but 
no result.
[outgoing]
exten => 021NXXXXXX,1,Dial/Zap/1/${EXTEN:1}

kindly pointout my mistakes/errors and helping me out.


Thanks In Advance .
Adnan Ahmed.