@Claydttu 24 FXS is the highest density at this time, available in both TA900/900e and NV6250. There are separate SKUs with/without FXO lifeline. If you need a combination of FXS/FXO, models are available with 16 FXS + 9 FXO.
The gateways mentioned are both UL listed.
If you're not familiar, please see this link for the nuances between the terms "Listed" and "Certified".
https://marks.ul.com/about/ul-listing-and-classification-marks/promotion-and-advertising-guidelines/...
"UL Listing means that UL has tested representative samples of a product and determined that the product meets specific, defined requirements"
