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Local Area Network (LAN) Architecture

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Layer-2 Connection to EdgeMarc Router

The last of the LAN design requirements is to ensure that the placement of SIP-enabled IP phones or

Analog Telephone adaptors (ATA) are placed in the network correctly with regard to the EdgeMarc

router. In order for the EdgeMarc to properly allow SIP messaging from a SIP device to the Public IP

space, as mentioned in Item 1 (above) only a single NAT-traversal can take place. This means that the

SIP devices need a direct Layer-2 Ethernet connection directly to the LAN interface(s) of the EdgeMarc.

This can be done a number of different ways, which include:

• direct cat-5 cable connect to a LAN port of the EdgeMarc

• Ethernet switch connectivity (non-VLAN)

• Use of 802.1q VLAN tagging.

The important consideration here is that there is not an intermediate Layer-3 device between any SIP-

enabled endpoint and the LAN interface(s) of the EdgeMarc.

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Edgewater Networks 4300T Manuale Utente Pagina 6