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#voip

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  • tutorialSep 2, 20264 min read

    Build a Secure VoIP Lab: Asterisk with SRTP and TLS

    A hands-on lab to stand up an Asterisk PBX, prove that plain RTP audio can be replayed from a packet capture, then lock it down with TLS-protected SIP and SRTP-SDES media and confirm the difference in Wireshark.

  • notesSep 1, 20262 min read

    Wireshark Display Filters: A VoIP-Focused Cheat Sheet

    The Wireshark display filters I reach for most, with a focus on the SIP, RTP, SRTP, and TLS traffic from the VoIP security lab. Quick reference for isolating signal from noise in a capture.