Voice Vlan - Cisco Small Business 200 Series Administration Manual

VLAN Management

Voice VLAN

In a LAN, voice devices, such as IP phones, VoIP endpoints, and voice systems are placed into the same
VLAN. This VLAN is referred as the voice VLAN. If the voice devices are in different voice VLANs, IP
(Layer 3) routers are needed to provide communication.
This section covers the following topics:
• Voice VLAN Overview
• Voice VLAN Configuration
• Telephony OUI
Voice VLAN Overview
This section covers the following topics:
• Dynamic Voice VLAN Modes
• Auto Voice VLAN, Auto Smartports, CDP, and LLDP
• Voice VLAN QoS
• Voice VLAN Constraints
• Voice VLAN Workflows
The following are typical voice deployment scenarios with appropriate configurations:
• UC3xx/UC5xx hosted: All Cisco phones and VoIP endpoints support this deployment model. For this
model, the UC3xx/UC5xx, Cisco phones and VoIP endpoints reside in the same voice VLAN. The
voice VLAN of UC3xx/UC5xx defaults to VLAN 100.
• Third-party IP PBX-hosted: Cisco SBTG CP-79xx, SPA5xx phones and SPA8800 endpoints support
this deployment model. In this model, the VLAN used by the phones is determined by the network
configuration. There may or may not be separate voice and data VLANs. The phones and VoIP
endpoints register with an on-premise IP PBX.
• IP Centrex/ITSP hosted: Cisco CP-79xx, SPA5xx phones and SPA8800 endpoints support this
deployment model. For this model, the VLAN used by the phones is determined by the network
configuration. There may or may not be separate voice and data VLANs. The phones and VoIP
endpoints register with an off-premise SIP proxy in "the cloud".
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