ZyXEL Communications XGS4600 Series - What Could Go Wrong

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6.3.5 What Could Go Wrong
1 If the priority is not the same as the setting in voice VLAN,
please verify the MAC address of the IP phone. The MAC
address can usually be found on the label or sticker
underneath the IP phones. This MAC address must be within
the range of the Voice VLAN OUI settings
2 Here are the expected behaviors of IP phones based on the
different settings. If you find the behaviors of the IP Phone is not
the same as your expectation, please refer below:
a. If the IP Phone is VLAN enabled and this VLAN is the same as
Voice VLAN: The Switch will keep the Voice VLAN and assign
the priority setting to the IP phone. The IP phone will only
recognize the tagged traffic. In this case, port 1 in VLAN 100 on
Switch should be set as tagged out (check the TX tagging
box).
b. If the IP Phone is VLAN enabled and this VLAN is different from
the switch’s Voice VLAN: The Switch will not apply any
changes on the VOIP traffic of the IP Phone.
c. If the IP Phone is VLAN disabled: The Switch will assign the
Voice VLAN and priority setting to the IP phone’s VOIP traffic.
This setting causes the IP Phone to only send and receive
untagged traffic. In this case, port 1 in VLAN 100 on Switch
should be set as untagged out (uncheck the TX tagging box).
3 Some computer network cards may not support the 802.1Q
(VLAN) information. If you don’t see the 802.1Q information in
Wireshark, you may need to use a different NIC. We
recommend using USB network adapters.