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Unified Networks IP Stimulus (UNIStim)

Unistim is a Nortel proprietary VOIP protocol. It is a lower level protocol than ["SIP"] or most other VOIP protocols. It's important to always think of the phone as a very dumb terminal. Whereas with ["SIP"], the phone has a basic understanding of a phone call,in Unistim the phone knows how to send key press events, display text, flash light, and stream audio. All intelligence is at the switch layer. Like ["SIP"] Unistim does use ["RTP"] as its audio transport. Unistim has a couple layers to it. Unistim


It is my understanding that Unistim is basically an ["IP"] adaptation of Nortel's DMS protocol.

Protocol dependencies

Example traffic

Example of multiple commands comming from the switch: attachment:cmd_array_from_switch.gif Example of phone sending key press event showing terminal id:


The PROTO dissector is (fully functional, partially functional, not existing, ... whatever the current state is). Also add info of additional Wireshark features where appropriate, like special statistics of this protocol.

Preference Settings

(XXX add links to preference settings affecting how PROTO is dissected).

Example capture file

XXX - Add a simple example capture file to the SampleCaptures page and link from here (see below). Keep this file short, it's also a good idea to gzip it to make it even smaller, as Wireshark can open gzipped files automatically.

Display Filter

A complete list of PROTO display filter fields can be found in the [ display filter reference]

Capture Filter

You cannot directly filter PROTO protocols while capturing. However, if you know the ["TCP"] port used (see above), you can filter on that one.