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Cisco Phone: How PC can see phone traffic

amigan_99 asked
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!
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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.
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Nice. I was unaware of this setting, good to know. Don't think I've ever seen that on a Polycom
amigan_99Network Engineer


Thanks for the reply BooST.
amigan_99Network Engineer


I rock.  Hahaha.

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