Zaptel 

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  GNU nano 1.2.4                  File: zaptel.conf

loadzone = us
defaultzone = us

#analog init
fxsks = 3-4


#span definitions
span = 1,1,0,esf,b8zs
span = 2,2,0,esf,b8zs

#chan defs
bchan = 25-47,49-71
dchan = 48,72

zapata
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[channels]
context = from-pstn
switchtype = national
usecallerid = yes
echocancel = yes
echocancelwhenbridged = yes
rxgain = 0.0
txgain = 0.0

signalling = fxs_ks
group = 0
channel = 3-4

signalling = pri_cpe
group = 1
channel => 25-47

signalling = pri_cpe
group = 2
channel => 49-71