Multimodem Telemetry driver for Ignition

I am looking for a Multimodem telemetry driver for Ignition 7.6.4 on Linux 64 bit. The communication protocols on the RTU side are Modbus TCP and DNP3.0 Ethernet.

The Ignition server has to communicate (Dial in and Dial out) with the remote RTUs through 15 PSTN Modems on a Modem rack. There are some solutions available on Windows platform but the client wants Ubuntu Linux. Kindly suggest and share your experience. Thanks.