https://vocal.com/voip/sip-analog-modem-server-sams-f/
SIP Analog Modem Server for Facsimile (SAMS-F)
The VOCAL SAMS for Facsimile (SAMS-F) is a solution for interoperating with legacy fax modems without the need for modem banks with E1/T1/ISDN connections.
sip analog modem serverfacsimilesams