Port 2099H.225.0 Annex G Signaling

Inter-gatekeeper signaling for communication between H.323 administrative domains.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as H.225 Annex G, H.323 Annex G

Technical Details

what runs on :2099

H.225.0 Annex G defines inter-domain signaling for H.323 gatekeepers, using ASN.1-encoded H.225.0 protocol messages. The IANA assignment covers both TCP and UDP on port 2099; implementations exchange request/response signaling after transport establishment, with behavior depending on the H.323 deployment. Related H.323 ports include 1718 for gatekeeper discovery, 1719 for RAS, and 1720 for endpoint call signaling.

Security Information

exposure of :2099

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.9 across 1,051 ports — this one sits 0.9 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

The signaling is not encrypted by default, so it should normally be restricted to known peer gatekeepers or carried through a protected private connection. Exposing it broadly can disclose H.323 domain and routing information and provide an attack surface for malformed-message processing or denial of service; H.235, VPNs, or other deployment-specific protections may provide additional security.

Record

iana registry entry

port: :2099
service: H.225.0 Annex G Signaling
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services Voice and Chat
usage: This port carries H.225.0 Annex G signaling between H.323 gatekeepers in different administrative domains. It is encountered in legacy VoIP and video-conferencing deployments rather than ordinary H.323 endpoint media flows.
lookups: 0rank 994
added: 2026-09-09
updated: 2026-09-09
references: IANA service name registry — port 2099

Something wrong?

This record is maintained by the engineers who use port 2099. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-09.

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :2099H.225.0 Annex G Signaling

Technical Details

Security Information

Related Ports

Port 2099H.225.0 Annex G Signaling