Cisco Phone: How PC can see phone traffic

Posted on 2010-11-12
Last Modified: 2012-05-10
I am troubleshooting an intermittent problem (one way audio) on some calls.  I have Cisco 7945G phones and users' laptops connect through the phone.  When I was at another company when I ran the sniffer on the laptop I could see all the phone traffic.  But that appears to no longer be the case.  Where can I modify the behavior such that phone traffic DOES appear at the NIC of the attached PC?  Thanks!
Question by:amigan_99
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Expert Comment

ID: 34124440
It really depends on the phone's built it hardware. If it's a built-in switch (instead of a hub), you're on a separate collision domain, and therefor will not see traffic destined for the phone. You'll need a hub in line, or have the phone attached to a managed switch that will allow port mirroring.

Accepted Solution

amigan_99 earned 0 total points
ID: 34124638
I found my own answer.  Enable the "Span to PC PortRequired Field" property for the device.  Change this in the device pool if you want this to apply to all your phones.

 Span to PC Port

Expert Comment

ID: 34125448
Nice. I was unaware of this setting, good to know. Don't think I've ever seen that on a Polycom

Author Comment

ID: 34125456
Thanks for the reply BooST.

Author Closing Comment

ID: 34153365
I rock.  Hahaha.

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