- 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 1300: H.323 Secure Call Control Signalling
Port 1300 is assigned by IANA to h323hostcallsc (H.323 Secure Call Control Signalling).
1300
How h323hostcallsc works
Voice & chatPort 1300 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 1300 dangerous?
We have no specific security note for port 1300. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 1300
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| h323hostcallsc | 1300 | TCP, UDP | H.323 Secure Call Control Signalling | - | 2013-01-31 |
// source: IANA service name and port number registry
Which program uses port 1300, and is it reachable?
Linux
sudo ss -ltnup 'sport = :1300' # process listening on 1300
sudo lsof -nP -i :1300macOS
sudo lsof -nP -i :1300
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1300 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 1300 netstat -ano | findstr :1300
From another machine
nmap -p 1300 -sV <host> sudo nmap -sU -p 1300 <host> nc -zv <host> 1300
Block it in the firewall
sudo ufw deny 1300/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 1300" -Direction Inbound -LocalPort 1300 -Protocol TCP -Action Block # Windows
What is port 1300 used for?
Port 1300 is assigned by IANA to h323hostcallsc (H.323 Secure Call Control Signalling).
Is port 1300 TCP or UDP?
Port 1300 is registered for TCP and UDP.
Is it safe to open port 1300?
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 1300 is open?
On Linux run "ss -ltnup 'sport = :1300'", on macOS "lsof -nP -i :1300", and on Windows "netstat -ano | findstr :1300" to see the local process. From another machine, "nmap -p 1300 <host>" shows whether it is reachable.