introductiontonetworking sip_authentication

The Voice over Internet Protocol (VoIP) is a technology that allows voice transmissions and multimedia communications over the Internet.

It involves a few protocols.

Session Initiation Protocol (SIP) πŸ”

The SIP protocol is quite used to VoIP authentication, from initiating, to managing, and terminating sessions.

Ports 🐲: TCP/5060 and TCP/5061

☠️ We may be able to enumerate users.

☠️ We can try to brute force credentials using sipcrack while they may be transferred as plaintext.

$ sudo apt install sipcrack
$ sipcrack -w /usr/share/wordlists/rockyou.txt message


The H.323 protocol is a system specification commonly used for voice and video conferencing over the internet.

Ports 🐲: TCP/1720

Real-time Transport Protocol (RTP)

The Real-time Transport Protocol (RTP) is used for delivering audio and video over IP networks in real-time. It's often used with RTCP.

Ports 🐲:

  • RDP: usually an even port number (TCP)
  • RTCP: usually RDP port + 1 (TCP)