I'm trying to capture Freephoneline app calls on a dedicated PC NIC by running Wireshark 2.4.2 on a Windows 10 64-bit PC. The captured calls from Freephoneline to an ATA are SIP type, and show up in Wireshark VoIP Calls window. But only when only 1 NIC is enabled. When 2 NICs are enabled, Windows redistributes traffic between them in a way that makes capturing Freephoneline on a dedicated NIC impossible - regardless on Metric manually set in each NIC Properties or auto assigned.
This happens despite Freephoneline app allows to bind it to a selected adapter at each launch.Apparently,, such binding works only for some calls, and even for them handshake goes through an adapter with lower Metric. I also tried using ForceBindIP app to further bind Freephoneline to a certain adapter, yet again not all its traffic went through that adapter, thus preventing capturing it as VoIP call.
Are their other options to completely limit Freephoneline traffic only to one NIC, while several NICs are enabled on the PC?