3Com 5500-SI Configuring the Voice VLAN Function, Configuration Prerequisites, support the voice VLAN function.

108 CHAPTER 6: VLAN OPERATION
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 Table99T
Configuring the Voice
VLAN Function
Configuration Prerequisites
■Create the corresponding VLAN before configuring a voice VLAN.
■VLAN 1 is the default VLAN and do not need to be created. But VLAN 1 does not
support the voice VLAN function.
Table99 Port modes and types of 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.