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Port 2099: H.225.0 Annex G Signalling

Port 2099 is assigned by IANA to h2250-annex-g (H.225.0 Annex G Signalling).

2099

How h2250-annex-g works

Other services
client:2099h2250-annex-gresponse client:2099h2250-annex-gresponse

The client sends a request to port 2099 and the h2250-annex-g service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 2099 dangerous?

We have no specific security note for port 2099. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 2099

ServicePortTransportDescriptionReferenceUpdated
h2250-annex-g 2099 TCP, UDP H.225.0 Annex G Signalling - 2013-01-31

// source: IANA service name and port number registry

03 Check it

Which program uses port 2099, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2099'      # process listening on 2099
sudo lsof -nP -i :2099

macOS

sudo lsof -nP -i :2099

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2099 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2099
netstat -ano | findstr :2099

From another machine

nmap -p 2099 -sV <host>
sudo nmap -sU -p 2099 <host>
nc -zv <host> 2099

Block it in the firewall

sudo ufw deny 2099/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2099" -Direction Inbound -LocalPort 2099 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2099 used for?

Port 2099 is assigned by IANA to h2250-annex-g (H.225.0 Annex G Signalling).

Is port 2099 TCP or UDP?

Port 2099 is registered for TCP and UDP.

Is it safe to open port 2099?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 2099 is open?

On Linux run "ss -ltnup 'sport = :2099'", on macOS "lsof -nP -i :2099", and on Windows "netstat -ano | findstr :2099" to see the local process. From another machine, "nmap -p 2099 <host>" shows whether it is reachable.

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