Hello

This game has fixed modem strings. It is not possible to configure dial string.
But with a hex editor it is possible to overwrite init strings not understood by dosbox in the .exe file. Without fixed .exe file, dosbox fails to establish the connection.

The modem commands not understood by dosbox:

Window one (Waiting for call), has unhandled command, but no problem with it:

1DOSBox version 0.72
2Serial1: Modem listening on port 1000...
3Command sent to modem: ->ATZ<-
4Modem response: OK
5Command sent to modem: ->ATE0F1Q1S0=1<-
6Modem: Unhandled command: F1

Window two (Dial phone), has unhandled commands, dosbox failed to establish the connection:

1DOSBox version 0.72
2Serial1: Modem listening on port 2000...
3Command sent to modem: ->ATZ<-
4Modem response: OK
5Command sent to modem: ->ATE0F1Q1DTLOCALHOST:1000<-
6Modem: Unhandled command: F1
7Modem: Unhandled command: D0

After fixing the games .exe file, the problematic Line looks like this, and dosbox sucessfully established the connection:

1Command sent to modem: ->ATDT      LOCALHOST:1000<-
2Connecting to host LOCALHOST port 1000
3Modem response: CONNECT 57600

There may be interest to add support for this issue.

With best regards,