There is a pretty useful feature that allows remote capture on a Polycom phone - https://community.polycom.com/t5/VoIP-SIP-Phones/FAQ-How-can-I-capture-the-network-traffic-of-the-ph...
But apparently Wireshark for macos doesn't have remote interface option. Is there a workaround for Macs?
this is not really a Poly issue as we do not supply the tool you are after. Utilizing a popular search engine finds many results >here< pointing the issue to the version of libpcap used on the Mac.
I suggest you post this in a relevant forum and then come back with an update to share here.