3Com Switch 7750 Configuration Guide

106 CHAPTER 12: VOICE VLAN CONFIGURATION
VLAN; voice ports cannot be added into or removed from the voice VLAN
through manual configurations.
■ In manual mode: you need to execute related configuration commands to add
a voice port to the voice VLAN or remove a voice port from the voice VLAN.
Tagged packets from IP voice devices are forwarded based on their tagged VLAN
IDs, whether the automatic or manual mode is used.
Voice VLAN packets can be forwarded by trunk ports and hybrid ports in voice
VLAN. You can enable a trunk port or a hybrid port belonging to other VLANs to
forward voice and service packets simultaneously by enabling the voice VLAN
function for it.
As multiple types of IP voice devices exist, you need to match port mode with
types of voice stream sent by IP voice devices, as listed in Table 58.
Table 58 Matching relationship between 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