Based on this product's specifications, here are some alternatives and similar models
Analog VoIP adapter Triton TA200 FXS — codecs G.711/G.729, T.38 fax, SIP over UDP/TCP/TLS, SRTP, 5V/1A
Summary description:
Triton TA200 is an FXS analog VoIP telephone adapter that connects traditional analog phones to IP networks. It supports voice codecs G.168, G.711, G.729A/B, and fax over T.31/T.38. Network and security protocols include UDP, TCP, TLS, SRTP and management via FTP/TFTP/HTTP/HTTPS/SSH. Compact power: 5 V output, 1 A current. Suitable for small offices and home deployments.