Tag Archives: VoIP

VoIP Captures

VoIP calls, using the network protocols SIP/SDP and RTP, are the de-facto standard when it comes to voice calls. Wireshark offers some special features to analyze those calls and RTP streams – even with a nice “Play Streams” option, which discretely decodes your calls. Ouch. Again and again, frightening which privacy-related protocols are completely unencrypted on the Internet!

Here are some hints for Wireshark as well as a downloadable pcap with three calls in there. ;) Have fun!

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My Network Companion: The ProfiShark

Since a couple of months I am carrying a ProfiShark 1G always with me. It’s a small network aggregation TAP that fits into my bag (unlike almost any other TAPs or switches with SPAN functionalities). It runs solely via USB 3.0, hence no additional power supply nor network port on my laptop is required to get it running.

In this post I’ll give some hints on how to use the ProfiShark 1G with Windows (read: some initial problems I had and how to solve them) as well as some use cases out of my daily work with it.

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VoIP von FRITZ!Box über Juniper SSG Firewall

Ich habe bei mir zu Hause die AVM FRITZ!Box als alleinigen Router abgelöst und durch eine Juniper SSG 5 Firewall ersetzt. Die FRITZ!Box ist trotzdem noch vorhanden und steht als IP-Client hinter der Firewall, primär um die Internettelefonie zu 1&1 bereitzustellen. Leider hat es etwas gedauert, bis ich die richtigen Einstellungen herausgefunden hatte, damit die Telefonie auch wirklich in beide Richtungen funktionierte.

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