asterisk users - Sep 2006 - Please help route incoming PSTN calls to Asterisk

I have a working Asterisk 1.2.5 system with SPA-3000 setup with the 
SPA3000 Configuration Wizard for Asterisk from Voxilla.com.

I can make outbound calls from the Sipura POTS phone (not sure they are 
actually going through the Asterisk box) but cannot get inbound calls 
from the outside.

Problem is I get no apparent response from Asterisk when PSTN calls come 
in, although POTS phones on the PSTN line ring ok. I'm pretty sure 
something is wrong in my configuration but I can't see what is wrong 
after a lot of web and book searching.

The system does me little good if I can't at lease _receive_ calls over 
the POTS line which is where most of my calls come from.

The rest is the part of sip.config and extensions.conf. I hope someone 
will give me tips to get it ringing.

sip.conf:
-----------
[telasip-gw] ; Gateway
;=======================context=telasip-in
type=friend
qualify=200
host=gw3.telasip.com
username=lalkoff
secret=xxxxxx
insecure=very
canreinvite=no
callerid="Larry Alkoff" <5123011411>
nat=yes

[200] ; Sipura Line 1 outbound to PSTN
type=friend
host=dynamic
context=home
secret=xxxxxxx
mailbox=200
dtmfmode=rfc2833
disallow=all
allow=ulaw

[201] ; Sipura forward PSTN inbound to Asterisk
; If you're using Asterisk, this goes into the Incoming ; settings for 
your Trunk
type=friend
host=dynamic
; If using Asterisk@home, change the below line to context=from-internal
context=home
secret=7883982
dtmfmode=rfc2833
disallow=all
allow=ulaw
insecure=very

[pstn-spa3k] ; Asterisk VOIP outbound to PSTN
; If you're using Asterisk, this section goes into the
; Outgoing Settings for your trunk.
type=peer
auth=md5
host=192.168.0.41
port=5061
secret=xxxxxxx
username=asterisk
fromuser=asterisk
dtmfmode=rfc2833
context=home
insecure=very

----------- end of sip.conf ----------------

extensions.conf:
----------------------
[home] ; Sipura forward PSTN inbound to Asterisk
exten => 200,1,Ringing
exten => 200,2,Dial(SIP/200,20,T)
exten => 200,3,Voicemail(u200)
exten => 200,4,Hangup

exten => 911,1,Dial(SIP/911@pstn-spa3k,60,)
exten => 911,2,Congestion

exten => _XXXXXXX,1,SetCallerID(512-301-1410)
exten => _XXXXXXX,2,Dial(SIP/${EXTEN}@pstn-spa3k,60,)
exten => _XXXXXXX,3,Congestion

;;exten => _XXXXXXX,1,Dial(SIP/${EXTEN}@pstn-spa3k,60,)
;;exten => _XXXXXXX,2,Congestion

exten => _1800XXXXXXX,1,Dial(SIP/${EXTEN}@pstn-spa3k,60,)
exten => _1800XXXXXXX,2,Congestion

exten => _1888XXXXXXX,1,Dial(SIP/${EXTEN}@pstn-spa3k,60,)
exten => _1888XXXXXXX,2,Congestion

exten => _1877XXXXXXX,1,Dial(SIP/${EXTEN}@pstn-spa3k,60,)
exten => _1877XXXXXXX,2,Congestion

exten => _1866XXXXXXX,1,Dial(SIP/${EXTEN}@pstn-spa3k,60,)
exten => _1866XXXXXXX,2,Congestion

----------- end of extensions.conf -------------

I'd most gratefully appreciate any help you could give me.

Larryalk

-- 
Larry Alkoff N2LA - Austin TX
Using Thunderbird on Linux