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Chapter 6 <br />

6.6 VLAN<br />

equipment<br />

H.323 Gateway<br />

- IP addresses of remote H.323 gateways<br />

- Gatekeeper integrated into the PBX: use of an integrated gatekeeper or not<br />

- Identification of gatekeeper: IP address of external gatekeeper<br />

SIP Gateway<br />

- IP address of remote SIP registrar<br />

- IP addresses of remote SIP gateways<br />

IP Telephony<br />

- Activate the integrated DHCP server: use of the integrated DHCP server or not<br />

- Dynamic Range: dynamic IP address range for IP telephony (IP sets) or for PCs<br />

6.6.1 Overview<br />

6.6.1.1 Basic description<br />

A Virtual Local Area Network (VLAN) is a group of network elements from one or more LANs<br />

that are configured in such a way that they can communicate as if they were attached to the<br />

same wire.<br />

VLANs are very flexible because they are based on logical connections instead of physical<br />

connections. The purpose is to segment ethernet traffic logically.<br />

The figure below represents the abstraction of a physical LAN divided into two VLANs: a Voice<br />

VLAN (VoIP frames) for IP phone sets, and a Data VLAN for computers. In VLAN uses, the<br />

number of VLAN can be different depending the LAN management rules and the choice of the<br />

network administrator.<br />

A VLAN architecture offers the following advantages:<br />

6-104

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