Voice Quality issue - Question to PCAP

[DanH]

Hi there,

I do have a problem with voice quality on a T-46G on a remote location.
I figured I could do a PCAP trace and then analyze that with Wireshark.
Unfortunately, the trace seems to be limited in size. I only get about the last 15 seconds of a call.
Is there a way to increase the PCAP buffer so that I can trace a full call with setup and hangup? I need about 2 minutes talking time to catch that voice quality issues.
I do not have any other possibility to make a trace onsite, unfortunately.
(kind of miss a snom phone with which that would not be an issue... PCAP buffer is much bigger there).

Thanks
Dan