Client is getting a new Aeonix VOIP phone system and the installer is telling me that the phones get an IP, register with the server and then after about 5 minutes they loose their IP and no longer work. I suspect this may have something to do with the Dynamic Voice VLAN settings in the switches but I am not familiar with these settings and could use some guidance as to whether they just need to be adjusted or disabled all together.
Switches: Cisco SG500-28P
VLAN 1 is data. VLAN 7 is voice
Switch ports are configured in Trunk mode with operational VLANs set to 1UP, 7T
Dynamic Voice VLAN is enabled with the Voice VLAN ID set to 7. All other settings are default (related to the Voice VLAN settings).
Auto Voice VLAN Activation is set to "External Voice VLAN trigger"