Local Area Network (LAN) Architecture
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Overview
The VOIP2320 Network Performance Program (NPP) is a quality-control initiative for the VOIP2320
subscriber community. The program was created to ensure that
VOIP2320 retail partners exceed the
business customer's expectations for high-quality communications services on a 24-7 basis.
Cornerstones of the Network Performance Platform include standardization that aggregates best
practices garnered from experience serving tens of thousands of end-users. In that effort, this
document is intended to define the customer premise network architectures that have been identified as
best-practices to accomplish those goals.
To ensure that the highest-quality service is delivered to every subscriber, it is important to review the
layout and design of the customer’s Internal IP network, or Local Area Network (LAN). Of particular
concern is the integration of SIP-enabled devices onto the LAN with respect to the presence of
customer firewalls and NAT traversal. These critical items are the root cause of a large portion of LAN
integration challenges and
VOIP2320
believes the approach defined in this document is the correct model
to appropriately address them.
The philosophy behind the NPP program regarding LAN design is to create a predictable, controlled
LAN design that accommodates VOIP-specific requirements while allowing flexibility to end-
subscribers. In particular, end-subscribers need the ability to deploy security, private networks (VPNs),
hosting DMZ and IP circuit redundancy on the same IP network as VOIP services.
This document will define a total of 5 LAN designs that provide solutions to address these requirements
when they arise during an end-customer installation. These designs are intended to address single
location installations that will have direct broadband Internet access. Larger customer installations
involving private WAN IP transport or aggregated Internet access across multiple locations will likely
involve additional design considerations. If a customer opportunity arises outside the scope of this
document, please engage
VOIP2320
for assistance.
The basic philosophy of all LAN designs endorsed by
VOIP2320 includes the following three
requirements:
1. The availability of at least a single static (in some cases multiple), Public IP
address(es) from the broadband service provider. Larger Public IP subnets are
supportable as well.
2. The integration of an Edgewater Networks brand EdgeMarc family router, this router
would be provisioned with the public IP address required above. See appendix for
configurations.
3.
VOIP2320 Certified SIP-enabled phones/endpoints will be on a common layer-2 Ethernet
segment directly to the LAN interface(s) of the EdgeMarc router. Explicitly stated:
“UNDER NO CIRCUMSTANCES WILL VOIP TRAFFIC TRAVERSE A NON-EDGEMARC
CUSTOMER FIREWALL”.
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