On 2019 Aug 06 16:54:00, you wrote to me:

 RW> ->  RW> 3141 is only for OS/2 users runing SIO and its
VMODEM.EXE driver
 RW> for 8- ->  RW> VMODEM-TO-VMODEM communication.

 RW> -> small clarification/correction: 3141 is the IANA assigned port number
 RW> for th -> vmodem protocol no matter what software implements the protocol
 RW> or what OS i -> is used on... the vmodem protocol is a slightly modified
 RW> form of the telnet -> protocol ;)

 RW> Yeah, but I think SIO's VMODEM.EXE listens on that port by default for
 RW> 8-bit VMODEM-to-VMODEM connections (using ATDT #  * Origin:  (1:3634/12.73)

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