Port 440Simple Gateway Control Protocol

Legacy protocol for controlling telephony media gateways from a call agent.

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

also known as sgcp

Technical Details

what runs on :440

SGCP uses text-based request and response messages over TCP or UDP, with transaction-oriented commands for gateway, endpoint, connection, and call control. The IANA assignment is port 440 for both transports; later MGCP deployments commonly use port 2427 instead. SGCP is obsolete relative to newer media-gateway control implementations.

Security Information

exposure of :440

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 3.7 across 683 ports — this one sits 1.7 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

SGCP traffic is not encrypted by default, and exposing it can permit interception or unauthorized control of a media gateway if the implementation lacks effective authentication or network restrictions. It should normally be confined to a trusted signaling network or protected with strong access controls.

Record

iana registry entry

port: :440
service: Simple Gateway Control Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services Voice and Chat
usage: SGCP is a legacy voice-signaling protocol used by call agents to control media gateways and their voice endpoints. It was an early predecessor to MGCP and is rarely encountered on modern networks.
lookups: 0rank 994
added: 2026-08-23
updated: 2026-08-23
references: IANA service name registry — port 440

Something wrong?

This record is maintained by the engineers who use port 440. 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 2026-08-23.

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :440Simple Gateway Control Protocol

Technical Details

Security Information

Related Ports

Port 440Simple Gateway Control Protocol