Is it possible to get a PCAP trace covering when a SNOM 720 (18.104.22.168e) phone starts up and connects to the network? I particularly want to see the DHCP conversation it has.
I'm aware that there's a switch on the phones GUI to record one but this can only be switched 'on' after connection to the network has been successful.
Are you trying to have the phone capture a pcap trace to USB without configuring it first? These instructions explain the procedure for enabling traces to USB storage.