- Use strong credentials and TLS for signalling.
- Rate-limit registrations to stop extension scanning and toll fraud.
- Alert on unexpected chat protocols leaving servers (possible command and control).
Port 22555: Vocaltec Internet Phone
Port 22555 is assigned by IANA to vocaltec-phone (Vocaltec Internet Phone), vocaltec-wconf (Vocaltec Web Conference).
22555
How vocaltec-phone works
Voice & chatPort 22555 sets up the call (who calls whom), then the voice travels as a stream of audio packets.
- Transport
- UDP · TCP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned2 registered services
- Range
- Registered (1024-49151)
- Category
- Voice & chat
Is port 22555 dangerous?
We have no specific security note for port 22555. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 22555
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| vocaltec-phone | 22555 | UDP | Vocaltec Internet Phone | - | - |
| vocaltec-wconf | 22555 | TCP | Vocaltec Web Conference | - | - |
// source: IANA service name and port number registry
Which program uses port 22555, and is it reachable?
Linux
sudo ss -ltnup 'sport = :22555' # process listening on 22555
sudo lsof -nP -i :22555macOS
sudo lsof -nP -i :22555
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 22555 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 22555 netstat -ano | findstr :22555
From another machine
nmap -p 22555 -sV <host> sudo nmap -sU -p 22555 <host> nc -zv <host> 22555
Block it in the firewall
sudo ufw deny 22555/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 22555" -Direction Inbound -LocalPort 22555 -Protocol TCP -Action Block # Windows
What is port 22555 used for?
Port 22555 is assigned by IANA to vocaltec-phone (Vocaltec Internet Phone), vocaltec-wconf (Vocaltec Web Conference).
Is port 22555 TCP or UDP?
Port 22555 is registered for UDP and TCP.
Is it safe to open port 22555?
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. Use strong credentials and TLS for signalling.
How do I check if port 22555 is open?
On Linux run "ss -ltnup 'sport = :22555'", on macOS "lsof -nP -i :22555", and on Windows "netstat -ano | findstr :22555" to see the local process. From another machine, "nmap -p 22555 <host>" shows whether it is reachable.