What Could Go Wrong - ZyXEL Communications GS2210 series Handbook

6.2.4 What Could Go Wrong

1 If the IP phone is not assigned to the 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).
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