Cisco SCCP

CISCO-SCCP (Skinny Client Control Protocol) is a proprietary protocol developed by Cisco Systems for use in their IP telephony solutions. It is primarily used for call signaling and control between Cisco IP phones and Cisco CallManager. The protocol operates over TCP port 2000.

What is Cisco SCCP

CISCO-SCCP, or Skinny Client Control Protocol, is a proprietary protocol developed by Cisco Systems. It is specifically designed for use in Cisco's IP telephony solutions, facilitating communication between Cisco IP phones and the Cisco CallManager. The protocol is lightweight and operates over TCP port 2000, making it efficient for call signaling and control.

The protocol was introduced to provide a streamlined method for managing call setup, teardown, and control functions in a VoIP environment. It allows for the transmission of signaling information such as dialed digits, on-hook/off-hook status, and other call control messages. This makes it an integral part of Cisco's Unified Communications solutions.

Over the years, CISCO-SCCP has been widely adopted in enterprise environments that utilize Cisco's IP telephony systems. Its efficiency and reliability have made it a preferred choice for organizations looking to implement robust and scalable VoIP solutions. Despite the emergence of newer protocols, CISCO-SCCP remains relevant due to its deep integration with Cisco's hardware and software ecosystem.

Cisco SCCP runs on TCP and UDP port 2000 and is official IANA port.

Security risk

If port 2000 is open and the CISCO-SCCP service is running, it could be exploited by attackers to intercept or manipulate VoIP communications. Unauthorized access could lead to eavesdropping, call hijacking, or denial of service attacks. It is crucial to secure this port with appropriate firewall rules and access controls.

In our UFW tutorial you can follow instructions how you can configure UFW to close port 2000. Use StackChanges to monitor if the Cisco SCCP port is closed and stays closed. StackChanges will send an alert if port 2000 is open again.