3Com 7757 Configuration Manual page 107

Table 58 Matching relationship between port modes and voice stream types
Port voice VLAN
mode
Manual mode
c
CAUTION: If the voice stream transmitted by an IP voice device is with VLAN tag
and the port which the IP voice device is attached to is enabled with 802.1x
authentication and 802.1x guest VLAN, assign different VLAN IDs for the voice
VLAN bound to the port, the default VLAN of the port, and the 802.1x guest
VLAN to ensure the two functions to operate properly.
Voice stream type Port type
Tagged voice stream Access
Trunk
Hybrid
Untagged voice stream Access
Trunk
Hybrid
Voice VLAN Overview 107
Supported or not
Not supported
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.
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.
Supported
Make sure the
default VLAN of
the port is a voice
VLAN.
Supported
Make sure the
default VLAN of
the port is a voice
VLAN and the port
permits the packets
of the VLAN.
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.