sip.conf
=======================================================

[general]
context=default
allowguest=no
nat=yes
externhost=xxxxxx.homelinux.org
localnet=192.168.123.0/24
register => 103558:xxxxxx@sip.us4.voip.ms:5060

internal_timer=yes
videosupport=yes
high_priority=yes

...

; ipkall
[1337]
type=peer
dtmfmode=rfc2833
context=ipkall-inbound
insecure=very
host=voiper.ipkall.com
nat=no


extensions.conf
============================================================

...

[ipkall-inbound]
exten => 1337,1,Answer
exten => 1337,2,Playback(tt-weasels)

...

chan_dahdi.conf
=============================================================
trunkgroups]

[channels]
language=en

context=ipkall-inbound
signalling=fxs_ks
faxdetect=incoming
usecallerid=yes
echocancel=yes
echocancelwhenbridged=no
echotraining=800
group=0