Sniffing From Mitel 5220 Phone

[schnarff]

Hello All,

I'm attempting to sniff traffic from a Mitel 5220 IP phone -- nothing fancy, I just want to get packet captures of a call from my desk to my cell phone so that I can learn about the protocols involved. I was under the impression that I could simply plug my laptop into the PC ethernet port over the phone and sniff the traffic (I'd be using tcpdump on a RedHat laptop), but this doesn't appear to be the case, as I get no traffic when attempting this. I've also tried plugging the PC ethernet port into a hub where the laptop was also plugged in, but I noticed that the hub's activity light isn't even blinking when I make a call, which indicates to me that there is no voice traffic being carried over this line.

Since we're using a power-over-LAN setup here at work, I assume that I'd have to get a PoL-enabled cable/hub if I wanted to route the main ethernet jack on the phone through something that my laptop could sniff on. Seeing as how that equipment isn't necessarily cheap, is there a simpler way to do all of this, preferably a free one?

Thanks,
Alex Kirk

 

[mextera]

The key to capturing a valid network sniff is the device the equipement is plugged into you plan on sniffing.

So if you are using a switch that is powered or not then you must be able to mirror that port. Or you must bring that port to a hub and then connect your phone and laptop to the hub.

Mextera

 

[ISDNman]

Got to use a hub, NOT a switch.

 

[mextera]

To mirror a port in a switch...

http://www.cisco.com/en/US/products...figuration_guide_chapter09186a008007fac5.html

What happens when you do this on a switch the port your sniffing from is showing the traffic of the port you want.

But if you do not have a manageable switch then you must use a hub, tru hubs are getting harder and harder to find.

Mextera