H3C S5560X-E1：与思科IP电话连接后自动断开

请问我使用LLDP协议与思科IP电话相连，配置的LLDP兼容CDP功能。但配置成功后一会儿，voice vlan就会自动断开。是因为IP电话会被识别成telephone类型吗，我在display lldp local-information中看到系统所支持的功能中不包含telephone类型。

<GY6F-D-5560X-OA-ASW01>display lldp local-information 

Global LLDP local-information: 

Chassis ID : 00dd-b636-6056 

System name : GY6F-D-5560X-OA-ASW01 

System description : H3C Comware Platform Software, Software Version 7.1.070, Release 1119P20 

H3C S5560X-54C-PWR-EI Copyright (c) 2004-2020 New H3C Technologies Co., Ltd. All rights reserved. 

 System capabilities supported : Bridge, Router, Customer Bridge, Service Bridge 

 System capabilities enabled : Bridge, Router, Customer Bridge

interfainterface GigabitEthernet1/0/12 

 port link-mode bridge 

 port link-type hybrid 

 port hybrid vlan 1 100 untagged 

 port hybrid pvid vlan 100 

 voice-vlan 502 enable 

 lldp tlv-enable med-tlv network-policy 502 

 poe enable 

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