3Com Switch 4200G Configuration Guide

56 CHAPTER 12: VOICE VLAN CONFIGURATION
As multiple types of IP phones exist, you need to match port mode with types of voice
stream sent by IP phones, as listed in Table 37.
CAUTION:
 If the voice stream transmitted by an IP phone is tagged and the port
which the IP phone is attached to is 802.1x-enabled, assign different VLAN IDs for the
voice VLAN, the default VLAN of the port, and the 802.1x guest VLAN to ensure the
two functions to operate properly.
 If the voice stream transmitted by the IP phone is untagged, the default VLAN of the
port which the IP phone is attached can only be configured as a voice VLAN for the
voice VLAN function to take effect. In this case, 802.1x authentication is unavailable.
Table 37 Port modes and voice stream types
Port voice
VLAN mode
Voice stream
type
Port type Supported or not
Automatic
mode
Tagged voice
stream
Access Not supported
Trunk Supported
Make sure the default VLAN of the port exists
and is not a voice VLAN. And the access port
permits the packets of the default VLAN.
Hybrid Supported
Make sure the default VLAN of the port exists
and is in the list of the tagged VLANs whose
packets are permitted by the access port.
Untagged voice
stream
Access Not supported, because the default VLAN of
the port must be a voice VLAN and the access
port is in the voice VLAN. To do so, you can
also add the port to the voice VLAN manually.
Trunk
Hybrid
Manual mode Tagged voice
stream
Access Not supported
Trunk Supported
Make sure the default VLAN of the port exists
and is not a voice VLAN. And the access port
permits the packets of the default VLAN.
Hybrid Supported
Make sure the default VLAN of the port exists
and is in the list of the tagged VLANs whose
packets are permitted by the access port.
Untagged voice
stream
Access Supported
Make sure the default VLAN of the port is a
voice VLAN.
Trunk Supported
Make sure the default VLAN of the port is a
voice VLAN and the port permits the packets of
the VLAN.
Hybrid Supported
Make sure the default VLAN of the port is a
voice VLAN and is in the list of untagged VLANs
whose packets are permitted by the port.