Switch D& F must have both voip and access vlans if you plan to to connect laptop to voip phones.
Move fibre uplink from Switch E to switch F, with a fiber media converter, or just use copper will do the job (unless there's 300 feet distance that preventing you).
I would simpley replace that E, if possible.
I assume you have a L3 device for inter-vlan routing and that the interface are trunked and proper encap protocols. Also, don't forget vtp domain, vtp password, vtp version, etc....
Lastly, replace switch E with cisco switch the Nortel BCM with Cisco CME. JK.
No seriously, it will make your job much easier when comes troubleshooting.
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