The second SIP port — FreeSWITCH's external profile, where carriers and trunks land.
IANA has 5080 registered as onscreen, "OnScreen Data Collection Service", which you will not meet in practice. The real occupant is FreeSWITCH: its shipped external profile binds 5080 (the $${external_sip_port} variable) for gateways and SIP trunks, with the internal profile on 5060 for registered handsets. The split exists because the external profile runs with auth-calls disabled — carriers authenticate by IP, not by registration.
Expose with care
The external profile accepts unauthenticated INVITEs by design, so the only thing between it and toll fraud is a source-IP ACL. Restrict it to your carrier's networks and audit the dialplan reachable from that profile.
$ nc -vz TARGET 5080Seen 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.