An IANA registration from Funk Software, with no public protocol behind the name.
2909 is registered as funk-dialout, "Funk Dialout", by Funk Software — the remote-access and RADIUS vendor behind Steel-Belted RADIUS, acquired by Juniper Networks in 2005. No public specification describes the protocol, and it does not appear in modern scan data in any meaningful volume. It is a legacy registration from the dial-up era rather than something you should expect to meet.
Expose with care
Nothing current is expected on 2909, so a listener means unidentified software — fingerprint it locally rather than assuming the registration explains it.
$ sudo lsof -nP -iTCP:2909 -sTCP:LISTENSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.