When TERM for UNIX displays this error, test cu or uucp against the same port. If either of those works, there may be a lockfile on the port. To bypass that, enter the command:

term -i

If that fails, list the port explicitly in the command line:

term -l/dev/ttyS0

Replace ttyS0 with the actual tty port. You can also combine this with the -i command-line parameter.

If everything above checks out, look at the number you’re dialing with the CALL command. The # character will cause the “unknown transport” error. This is problematic, particularly if your phone system requires you to dial something like #8 to get an outside line.

CR 412, CALL

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