Something

zaptel.conf:
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loadzone=us
defaultzone=us

# Sangoma A102 port 1 (T1 to stations [Zap/g1])
span=1,0,0,esf,b8zs
fxoks=1-24

# Sangoma A102 port 2 (T1 to PSTN [Zap/g2])
span=2,0,0,esf,b8zs
e&m=25-48

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zapata.conf:
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[channels]
; Sangoma A102 port 1 (channels 1-24) (internal T1 to stations)
        context=from-internal
        transfer=yes
        threewaycalling=yes
        usecallerid=yes
        group=1
        signalling=fxo_ks
        channel => 1-24

; Sangoma A102 port 2 (channels 25-48) (outbound T1 to PSTN)
        context=from-internal
        transfer=no
        threewaycalling=no
        group=2
        signalling=em_w
        channel => 25-48

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extensions.conf:
-------------------------------------------------------

[globals]
        ; FXS Channel bank to stations is Zap/g1
        ; T1 to PSTN is Zap/g2
        ; POTS to PSTN is (will be) Zap/g3
        EMERTRUNK=Zap/g3
        LOCALTRUNK=Zap/g2
        CB=Zap/g1
        LDTRUNK=Zap/g2

[macro-lddial]
        ; $ARG1 = Accountcode
        ; $ARG2 = Number
        exten => s,1,Set(CDR(accountcode)=${ARG1})
        exten => s,n,Dial(${LDTRUNK}/${ARG2})
        exten => s,n,Hangup

[localtoll]
        exten => _NXXXXXX,1,NoOp(Dialing local call to ${EXTEN})
        exten => _NXXXXXX,n,Macro(lddial|9999|217${EXTEN})

[default]
        include => localtoll