Registered · Cross-platform

1720 H.323 call signaling

TCP Yes
UDP —
SCTP —
DCCP —

What it is

H.323 Q.931 call setup.

When / why

VoIP/video call establishment.

Protocol status detail

TransportStatusMeaning
TCP Yes Assigned by IANA and standardized, specified, or widely used on this port.
UDP — Not applicable for this transport.
SCTP — Not applicable for this transport.
DCCP — Not applicable for this transport.
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Port range

Registered (1024–49151). Assigned by IANA on request; usable without elevated privileges on most systems.

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