How do I configure a Netgear switch for Wireshark captures?

I have a client experiencing voice quality issues and their voice vendor is asking us to perform some Wireshark packet captures.  They have a Netgear GS724TPv2 PoE switch, which supports port mirroring, so according to NEC's instructions I mirrored the ports the PBX and IP phone are connected to and made the port my laptop is connected to the probe port.  I run the captures, making test phone calls from the IP phone, but NEC is saying the captures aren't showing any SIP traffic to/from the PBX and the IP phone.  

I don't run packet captures very often so I'm hoping an expert out there can confirm if the configuration I am running the captures in is correct?  Thanks in advance!
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Mal OsborneAlpha GeekCommented:
I keep an old 8 port, 10/100 HUB in my laptop bag for situations like this.

Hubs are unusual these days, but still heaps of them on Ebay. Using one of these is generally a lot quicker and easier than reconfiguring a switch.

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Michael PfisterCommented:
I'd also prefer a hub but could be difficult if you require PoE.

When using VoIP usually the VoIP traffic is seperated in an extra VLAN. make sure the Netgear mirrors the correct VLAN or all VLANs.
Mal OsborneAlpha GeekCommented:
POE injectors are cheap and small.
CruJonesAuthor Commented:
Thanks for the replies!  It sounds like I'm off to Weird Stuff to find a hub.  To run the capture do I connect the PBX, IP Phone and Laptop running Wireshark all to the hub?  Thanks again!
Michael PfisterCommented:
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