RFC 2217 Telnet Com Port extensions are used to communicate modem hardware signal status from a modem on a network access server (NAS) to a TCP/IP client. An example would be a client PC using a package such as DialOut/EZ (Tacticalsoftware.com) to provide an emulated COM port via a TCP connection to a Cisco AS5000 NAS with integrated modems.
When Com Port extensions are enabled on the NAS, the binary Telnet option (RFC 856) should be used. The Telnet client must connect to TCP port 6000 + for individual lines, or 7000 + for rotaries on the Cisco NAS.
Unfortunately it only describes ip telnet comport enable.
That command seems to have little effect, because all the RFC2217 services work even if the command is not in effect. It is possible to communicate with a NAS on TCP port 2000+, 4000+, 6000+ and 7000+ for rotaries.
It's the un-documented commands that I'm interested in though.
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