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we're trying to debug a faulty Panasonic Mobile softphone SIP app (both Android & Apple versions), as many calls are randomly dropped unexpectedly. This is the conceptual connection diagram: enter image description here

We want to ensure that our setup is not conflicting somehow, who knows if the router, the switches or access points are dropping packets to such an extent which will make communication fail?

Data:

Core LAN 192.168.8.0
VLAN Staff 10.0.100.0
VLAN Guest 10.0.200.0
VLAN PBX 172.16.4.0
  • Mobile phones running the app may connect to WIFI on Core LAN or VLANs Staff, Guest
  • PBX and hard phones are running on VLAN PBX
  • Apps require Internet access to authenticate to Panasonic servers, then communication with PBX is established

How could we capture all traffic from a handset running the app to the PBX? Is there a sort of legit man-in-the-middle technique that can be use (sort of Wireshark)??

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    Wireshark is exactly what I would use. Your PBX should provide some sort of logging information. Do phones stay associated/registered with the PBX? – Ron Trunk Nov 24 '20 at 15:20
  • There's a sort of syslogging on the PBX, but lacks of useful information. There's a log on the phones that will show useful data. What I miss is where would I run Wireshark, assuming none of the devices in the game will allow running (router, switches, PBX & mobile app) – Riccardo Nov 24 '20 at 15:23
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    If you can't configure port mirroring (monitoring) on any of the devices, you will need to install another device (switch) where you can. – Ron Trunk Nov 24 '20 at 15:25
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    This link on the Ubiquti site regarding port mirroring may help you. – Ron Trunk Nov 24 '20 at 16:32
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    The diagram you provided is the vendor ideal diagram, not a diagram of your specific implementation. There is no Ubiquiti or any other devices you actually have in your network. What was being asked was that you provide a diagram of your implementation so that we can see where you may be able to mirror traffic. – Ron Maupin Nov 24 '20 at 21:48

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