Defining Voice Vlan - 3Com 3CRUS2475 User Manual

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HAPTER ONFIGURING
Defining Voice
VLAN
VLAN
S
Voice VLANs allows network administrators enhance VoIP service by
configuring access ports to carry IP voice traffic from IP phones on specific
VLANs. Network Administrators can configure VLANs on which voice IP
traffic is forwarded. Non-VoIP traffic is dropped from the Voice VLAN.
Voice VLAN also provides QoS to VoIP, ensuring that the quality of sounds
does not deteriorate if the IP traffic is received unevenly. The system
currently supports one voice VLAN.
When configuring Voice VLAN, ensure the following:
IP phones are configured with VLAN-mode as enabled, ensuring that
■
tagged packets are used for all communications.
If the IP phone's VLAN-mode is disabled, the phone uses untagged
■
packets. The phone uses untagged packets while retrieving the initial
IP address through DHCP. The phone eventually use the Voice VLAN
and start sending tagged packets.
The Voice VLAN Page contains the following fields:
To configure Voice VLANs:
1 Click Policy > Voice VLAN. The Voice VLAN Page opens:
Figure 76 Voice VLAN Page
The Voice VLAN Page contains the following fields: