ZyXEL Communications GS3700 Series, Handbook

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Implementing VOIP
6.1 How to configure an IP Phone's VLAN using LLDP-MED
The example shows administrators how to use LLDP-MED to configure an
IP Phone’s VLAN ID. Any IP Phone connected to the switch will be
assigned to the certain VLAN based on the switch’s port. In the
following topic, we will also introduce other ways to send VOIP traffic
into a specific (Voice) VLAN. Implementing VOIP allows administrators
the option to prioritize Voice traffic during network congestions, thus,
preventing poor voice quality or miscommunications between IP
Phones.
Configure LLDP-MED to assign an IP Phone’s VLAN
Note:
All network IP addresses and subnet masks are used as examples in this article.
Please replace them with your actual network IP addresses and subnet masks. This
example was tested using XGS4600-32 (Firmware Version: V4.50).