If you’re like me and care about IPv6 and want an analog telephone adapter for your BBS, you want a Cisco ATA 191/192 instead of a Cisco SPA 121/122. I forget why I bought the SPA 122 after I bought an ATA 191 and needed more ports, I guess to compare them or the 122 looked similar enough and it was cheaper on eBay or something.
Anyways, the ATA 191 does IPv6, and the SPA 122 does not at least as of 1.4.1 (SR5) Oct 14 2019
SPA 122 network settings
ATA 191-MPP network settings
