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Unless the IP phone is running on the Mac or on another virtual machine on the Mac, the 3CX PBX will have to go through the Mac to communicate with it, so you might be able to run Wireshark on the Mac and capture on whatever interface is on the same LAN as the IP phone or whatever other piece of equipment traffic to and from the IP phone passes through (switch, wireless access point, etc.).

Even if it is on the Mac or another virtual machine on the Mac, you might be able to capture on an interface provided by the virtual machine software. My Mac is running Sierra and VMware Fusion 10, and if I capture on vmnet8 it sees traffic from a ping I'm doing on a virtual machine to a site on the Internet.