Cisco SG500-28P Dynamic Voice VLAN, enable or disable?

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"
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Aaron TomoskyDirector of Solutions ConsultingCommented:
I gave up on autovoice vlan years ago. I'd suggest turning it off.
itcokAuthor Commented:
How about SmartPorts? I've never had issues with them before but I'm considering disabling that feature as well.
Aaron TomoskyDirector of Solutions ConsultingCommented:
Same thing. I like my switches to be configured and ports labeled and not changing unless I change them. Infrastructure has enough moving parts without switches mucking around with port setting whenever a user plugs something into the wrong port.

My default is untagged workstations vlan, tagged phone vlan on all desktop ports. That way you can plug a computer or phone in anywhere without any automagic stuff enabled.

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itcokAuthor Commented:
I disable those "features" this evening and see what the installer has to say tomorrow.
itcokAuthor Commented:
I haven't heard back from the phone guy so I'm going to assume it was either the SmartPorts or Dynamic Voice VLAN that was causing the problem.  Thanks for the assist.
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