Not exactly what you're asking for, but there's this for Linux - https://www.aon.com/cyber-solutions/aon_cyber_labs/introducing-d-modem-a-software-sip-modem/ ht

Not exactly what you're asking for, but there's this for Linux - https://www.aon.com/cyber-solutions/aon_cyber_labs/introducing-d-modem-a-software-sip-modem/ https://www.aon.com/cyber-solutions/aon_cyber_labs/introduci...