>>> chan_dahdi.com
#include dahdi-channels.conf
[trunkgroups]
switchtype=national
usecallerid=yes
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
canpark=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
group=1
callgroup=1
pickupgroup=1


>>> dahdi-channels.conf
; Span 1: TE4/0/1 "T4XXP (PCI) Card 0 Span 1" (MASTER)
[channels]
;group=0,11
;context=from-pstn
;switchtype = dms100
;signalling = pri_cpe
;channel => 1-23
;context = default

; Span 2: TE4/0/2 "T4XXP (PCI) Card 0 Span 2"
;group=0,12
;context=from-pstn
;switchtype = national
;signalling = pri_cpe
;channel => 25-47
;context = default

; Span 3: TE4/0/3 "T4XXP (PCI) Card 0 Span 3"
;group=0,13
;context=from-pstn
;switchtype = national
;signalling = pri_cpe
;channel => 49-71
;context = default

; Span 4: TE4/0/4 "T4XXP (PCI) Card 0 Span 4"
group=0
context=from-pstn
switchtype = national
signalling = pri_cpe
channel => 73-95
context = default

csgtacsip1:/etc/asterisk#