[Asterisk-Users] Asterisk stopped answering the calls

[Joseph]

Asterisk stopped answering the calls.
I'm just experimenting with asterisk, upon setup there is a [demo]
context.
I have SPA-3000 with PSTN line:
Dial plan 2: S0<:1000 at 10.0.0.101>
my sip.conf
localnet = 10.0.0.101          
localmask = 255.255.255.0 

[3000]
type=friend
host=dynamic
username=3000
secret=my_secret
mailbox=3000
context=from_pstn
callerid="PSTN GW" <3000>
deny=0.0.0.0
permit=10.0.0.154  ;SPA-3000 IP address
dtmfmode=rfc2833
canreinvite=no
cantransfer=yes

My extension.conf
[globals]
PSTN_GW=10.0.0.154:5062
[from_pstn]
exten => 1000,1,Goto(demo,s,1)
[demo]
exten => s,1,Answer          
exten => s,2,DigitTimeout,5  
exten => s,3,ResponseTimeout,10 
exten => s,4,BackGround(demo-congrats

When I type "show channels" I get "0 active channel(s)"

Why isn't asterisk answering the call?
--
#Joseph