The second of the two registered ISO IP signalling ports, and just as rare as the first.
IANA registers 1107 as isoipsigport-2, the companion to 1106. As with its pair, no public protocol document accompanies the registration and Nmap's service-frequency data shows it open on a negligible share of hosts. If you see it, enumerate the listening process rather than trusting the registry name.
Expose with care
Unknown service on an unused registered port — identify it locally before it faces any untrusted network.
$ sudo lsof -nP -iTCP:1107 -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.