смотрим в документации параметр iface

cronyx_modules="ce cdahdi"

tau32_0="clock=rcv0"
tau32_0_e1_0="crc4=off"
tau32_0_e1_1="crc4=off"
ce0="iface=0 dahdi ts=1-16"
ce1="iface=1 dahdi ts=1-16"

# sconfig -a
tau32_0 adapter=mux led=smart clock=rcv0
tau32_0.e1_0(Twin Pair) unframed=off cas=off loop=none line=hdb3 crc4=off higain=off monitor=off
tau32_0.e1_1(Twin Pair) unframed=off cas=off loop=none line=hdb3 crc4=off higain=off monitor=off
tau32_0.0/ce0 dahdi mode=voice iface=0 1024000 mtu=128 qlen=8 ts=1-16 ec-delay=0ms
tau32_0.1/ce1 dahdi mode=voice iface=1 1024000 mtu=128 qlen=8 ts=1-16 ec-delay=0ms