If a user is in a phone call on a Mitel 5220 handset and they reboot their PC (in this case a Lenovo desktop PC), the user experiences around 2 seconds of silence twice while the PC is booting - once just before the BIOS screen is displayed and once just before the Windows 7 logon screen is displayed.
This is caused by the PC changing the NIC speed during bootup from 100Mbps to 10Mbps, which in turn causes the Mitel 5220 handset to change its network speed from 100Mbps to 10Mbps, and during this change voice packets are dropped (the user experiences silence).
On the Lenovo PC in question this issue can be resolved by either setting 'Shutdown Wake-on-LAN' to disabled in the properties of the network card on the Advanced tab, or by changing the 'WOL & Shutdown Link Speed' setting to 100Mbps (default is 10Mbps).
You can demonstrate the same issue by connecting any PC with a 10/100 NIC to the back of the Mitel 5220 phone and within Windows manually setting the speed of the network card to 10Mb. Obviously you need to be in a phone call on the Mitel handset at the time to notice the 2 second silence.
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