TDM400
From KlavoWiki
The TDM400/TDM410 is a 4 port analogue card that can have a mixture of FXO and FXS port totalling no more than 4.
The following configuration is to configure the card with a single FXS card in slot number 4.
/etc/zaptel.conf
fxsks=4
/etc/asterisk/zapata.conf
signalling=fxs_ks channel => 4
NOTE:The order of the lines above is important. The signalling must come before group and group must come before channel.