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connect S20 with Comcast/Xfinity analog line

I jest purchase S20 PBX with YST-S2 module with 2 FXS ports to terminate two analog telephones/fax line.

I need this S20 PBX able to connect out existing two comcast analog line, What am I missing, because I don't see any jack in S20 can connect RJ11 to Xfinity Voice Modem(Analog2 Port). 

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