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SPA5XX Phones freezing when receiving multicast page

Hello,

For several months I have been troubleshooting an intermittent problem with a deployement of SPA509Gs and SPA514Gs where the phones freeze and require a power cycle after receiving a multicast page.  I have tried every available 7.5.x firmware version without any change.  I have tried different switches and disabling CDP and LLDP to no avail.  When the phones are assigned to a VLAN and receive a page a random one or two out of 35 will lock up.  We have tried Netgear FS724TP, Cisco SG200, and SG300 switches.  Is this a known issue and is there a fix in the works?  We have about 60 of these and the ability to make a multicast page is essential in our deployment.

Thanks,

Spencer

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