I have a ShoreTel phone plugged into a Cisco 2960x and we use port security. Before I configure port-security for the end user I normally see 3 MAC addresses on the port, 1 for the PC & 2 for the phone. (1 associated to data VLAN, the other to Voice VLAN)
In this case I do not see the phones MAC address associated to the voice VLAN. When i configure port-security the phone shows a message of "No Service", once I remove port-security it works fine.
Has anyone seen this behavior? I am thinking it may be a bad phone.