In Enterasys B5 switch, we have arp inspection and dhcp snooping protocols on. We got IP telephone with Poe. Sometimes these IP telephones can not register to PBX server. These ports are not in trust mode. Can this affect IP telephones?
The things to check: Is the PBX a. Static IP then if yes then it should be a trusted port b. Do the phones show up with a binding (MAC and IP ) list
Are the phones going through WIFI a. If the AP port is set to Arp Inspection and DHCP snooping then all it takes is for a statically assigned address traffic come across the wifi to the port on a switch and the port will be disabled for a moment
I suggest opening a ticket with the GTAC so we can assist you and resolve your issue. as there are more questions that I would ask, I will be glad to assist so mention to the Tech to please include Jason Parker as a copy to in the case.-