error: [Nov  8 23:10:39] ERROR[10173]: chan_zap.c:7300 mkintf: Channel 24 is reserved for D-channel.

/etc/zaptel.conf: 

loadzone = us
defaultzone=us

span=1,1,0,esf,b8zs
span=2,2,0,esf,b8zs
span=3,3,0,esf,b8zs
span=4,4,0,esf,b8zs

bchan=1-23,25-71,73-96
dchan=24,72

/etc/asterisk/zapata.conf:

[trunkgroups]

trunkgroup=>1,24,48
trunkgroup=>2,72,96

spanmap => 1,1,1
spanmap => 2,1,2
spanmap => 3,2,3
spanmap => 4,2,4

[channels]

switchtype=national
signalling=pri_cpe
usecallerid=yes
callerid=asreceived
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
rxgain=0.0
txgain=0.0
relaxdtmf=yes
musiconhold=native
language=en
context=GBX-Inbound


group = 1
channel => 1-23
channel => 25-71
channel => 73-96