Newtechky is correct, analog and POTS mean exactly the same thing, different letters.
The CTX/CIX will accept any of the older single line port cards, PSTU, RSTU, RDSU in addition to the BSTU and ASTU. Is that enough U cards for U?
The RDSU came equipped with two single line ports and two more could be added with a daughterboard, and the bottom four ports were the same as a PDKU which would run 2000 series phones such as 2020SD.
If you have a small place with few lines or a mansion with few lines for that matter, the fax can be put on the system and used to make calls out but this blocks faxes from being received.
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