- 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 2000: Cisco SCCP
Port 2000 is assigned by IANA to cisco-sccp (Cisco SCCP).
2000
How cisco-sccp works
Voice & chatPort 2000 sets up the call (who calls whom), then the voice travels as a stream of audio packets.
- 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
- Voice & chat
Is port 2000 dangerous?
We have no specific security note for port 2000. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 2000
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| cisco-sccp | 2000 | TCP, UDP | Cisco SCCP | - | 2003-11 |
// source: IANA service name and port number registry
Which program uses port 2000, and is it reachable?
Linux
sudo ss -ltnup 'sport = :2000' # process listening on 2000
sudo lsof -nP -i :2000macOS
sudo lsof -nP -i :2000
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2000 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 2000 netstat -ano | findstr :2000
From another machine
nmap -p 2000 -sV <host> sudo nmap -sU -p 2000 <host> nc -zv <host> 2000
Block it in the firewall
sudo ufw deny 2000/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 2000" -Direction Inbound -LocalPort 2000 -Protocol TCP -Action Block # Windows
What is port 2000 used for?
Port 2000 is assigned by IANA to cisco-sccp (Cisco SCCP).
Is port 2000 TCP or UDP?
Port 2000 is registered for TCP and UDP.
Is it safe to open port 2000?
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 2000 is open?
On Linux run "ss -ltnup 'sport = :2000'", on macOS "lsof -nP -i :2000", and on Windows "netstat -ano | findstr :2000" to see the local process. From another machine, "nmap -p 2000 <host>" shows whether it is reachable.