FXS lines from carrier< - - > FXO Modem pool rack And you want to have: FXS lines from carrier < - - > FXO to E1 PRI channel bank < - - > Cisco router with E1 PRI.
If so, you need an FXO to E1 PRI channel bank. Here is one example: http://www.pulsewan.com/valiant/vcl_pri.htm
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