中兴C300 GPON连接用户光猫，网络没问题，但是语音始终不能正常运行
同一台设备下的EPON的语音正常工作
请各位大神们帮我检查一下配置，到底哪里出了问题！
十分感谢

interface gpon-olt_1/2/2
onu 1 type F620 sn ZTEGxxxxxxxxxxxx
!
interface gpon-onu_1/2/2:1
sn-bind enable sn
tcont 2 profile UP-10M
tcont 3 profile UP-2M
gemport 1 unicast tcont 2 dir both
gemport 3 unicast tcont 3 dir both
switchport mode hybrid vport 1
switchport mode hybrid vport 3
service-port 1 vport 1 user-vlan 1001 vlan 137
service-port 2 vport 3 user-vlan 50 vlan 50
traffic-profile DOWN-10M vport 1 direction egres

pon-onu-mng gpon-onu_1/2/2:1
service HSI type internet gemport 1 cos 0 vlan 1001
service aaa type voip gemport 3 cos 1 vlan 50
switchport-bind switch_0/1 veip 1
vlan port eth_0/1 mode tag vlan 1001
vlan port eth_0/2 mode tag vlan 1001
vlan port eth_0/3 mode tag vlan 1001
vlan port eth_0/4 mode tag vlan 1001