The WAN and PC ports of my Yealink phones are set to auto negotiate, but are not always negotiating the correct speed. Sometimes it’s only 100Mb despite connecting to a Gb port on the LAN switch.
Often I have 1Gb on the WAN port, but only 10Mb (!) on the PC port.
Thinking of hard coding the 1000Mb into the phone instead of auto negotiation. Not sure what adverse effects to expect.
Connecting to a 100Mb port still works even if port on phone is set to 1Gb, just tried that.