Problem has been resolved by turning off VTP Pruning (under VLAN Properties on CNA) on the Cisco switch that is trunked between the phone server and SGE2010P. This apparently functioned previously because there used to be a phone on a 2950T connected to the SGE2010P. However, when the sole phone on the 2950T was removed, the 2950T and 3560G decided that the phone VLAN was no longer in use and pruned it off. This is because the SGE2010P is apparently transparent to the enterprise switches and ignored the prescense of the other phones on the VLAN. As such, stopping the switch from pruning vlans any further now allows the VLAN's to continue to be actively pushing around data that otherwise would have been pruned out.
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