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Local Area Network (LAN) Architecture

Page 5 of 51

Benefits of the NPP LAN Design Requirements

Public IP Address

The requirement for a static, publicly routable IP address at the service location of the voice services

fulfills two needs:

• First, it ensures that no more than a single NAT-traversal occurs when SIP signaling and RTP

audio packets are entering or leaving the customer LAN. NAT-traversal for these traffic types

from one IP network to another has the potential to create a “state-of-confusion” to the far-end

source for inbound traffic or the recipient for outbound traffic. A solution to address the “state-

of-confusion” for a single NAT traversal is an inherent attribute of the designs defined in this

document. However, the potential presence of multiple NAT-traversal hops is not supportable,

which dictates the public IP address requirement.

• Second, by assigning a static, public IP address to the customer premise, it can be used to

enable additional services by

VOIP2320. Specifically, the customer premise can be build into a

Network Management System run by

VOIP2320. This system, EdgeView, works in conjunction

with the EdgeMarc routers to enable CPE configuration services, call monitoring, reporting and

service troubleshooting tools. More detail on these features is described below under the

EdgeMarc routers.

EdgeMarc Router Family

The requirement for EdgeMarc routers is an enabler for a number of features. However, most

importantly EdgeMarc routers include standardized SIP Application-Layer-Gateway (ALG) functionality

that has been custom tuned to

VOIP2320 specifications. This is a vital requirement of service delivery

reliability. While there are countless other devices that claim this functionality, the reality is there in no

standardization for SIP ALG functionality and many vendor’s products result in unpredictable or even

harmful behavior. Simply stated:

VOIP2320 knows an EdgeMarc will

work, while other SIP ALGs might

work. While adapting/tweaking various equipment to an installation is possible,

VOIP2320 intends to

avoid making each customer installation a “science project” and instead adopting a uniform approach

for installations. The minimal effort invested in this approach during customer installations pays

dividends in reduced service troubleshooting and customer dissatisfaction.

In addition to standardized SIP ALG functionality, there are several beneficial attributes of the

EdgeMarc platform that do not exist with other vendors:

• Automation of CPE configuration via the

VOIP2320 Plug-n-Dial platform. EdgeMarc routers enable

out-of-the-box configuration of phones and ATAs to pre-provisioned user accounts by

interacting with a hosted CPE configuration server on the phones behalf. Simply stated: There

is no need to pre-configure a phone prior to delivery to the subscriber’s premise.

• Additionally, as mentioned under the IP address section,

VOIP2320 hosts a Network Management

System for EdgeMarcs that includes functionality such as MOS statistics, LAN/WAN problem

isolation, and signaling capture.

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