Connect to PSTN slow

I’m a newbie. I installed Asterisk and my config zapata.conf file follow:

[channels]
language=en

; include zap extensions defined in AMP
#include zapata_additional.conf

; XTDM20B Port #1,2 plugged into PSTN
;AMPLABEL:Channel %c - Button %n
hidecallerid=no
callwaitingcallerid=yes
;threewaycalling=yes
;cancallforward=yes
;callreturn=yes
context=from-internal
signalling=fxs_ks
faxdetect=incoming
usecallerid=yes
echocancel=yes
echocancelwhenbridged=no
echotraining=800
rxgain=3.0
txgain=3.0
rxwink=300
group=0
channel=1-4
immediate=yes

When I connected my phone line directly to telephone, it wastes only 3 seconds to establish a call. But when I connected to Asterisk server, it wastes 13 seconds.
Pls help me!!! How can I configure to establish the call faster?
Thanks in advanced

hello:
comment the line faxdetect=incoming in your zapata.conf
and please check the dialplan.
regards!
James.zhu

is your DNS server ( defined in /etc/resolv.conf ) reachable?

[quote=“james.zhu”]hello:
comment the line faxdetect=incoming in your zapata.conf
and please check the dialplan.
regards!
James.zhu[/quote]

Thanks, It is working better