Network Assessment; 4600 Series Ip Telephones - Avaya 4600 Series Administrator's Manual

Network Assessment

The current technology allows optimum network configurations to deliver VoIP with perceived
voice quality close to that of the Public Switched Telephone Network (PSTN). Not all networks
can take advantage of packet voice transmissions. Some data networks have insufficient
residual capacity for even compressed voice traffic. In addition, the usual approach to
developing data networks by integrating products from many vendors requires testing the
components for Voice over IP traffic compatibility.
Avaya assumes that your organization has performed a network assessment with or without
Avaya's assistance before attempting to install Voice over IP. The network assessment provides
a high degree of confidence that the existing data network has the capacity to carry voice
packet traffic. The network assessment assures that the existing data network is compatible
with the required technology.
A network assessment should include:
A network audit to review existing equipment and evaluate its capabilities, including its
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ability to meet planned voice and data needs.
A determination of network objectives, including the dominant traffic type, selection of
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technologies, and setting voice quality objectives.
The assessment should leave you confident that the implemented network will have the
capacity for the foreseen data and voice traffic, and can support H.323, SIP, DHCP, TFTP,
HTTP, and jitter buffers in all applications.
It is important to distinguish between compliance with the minimal VoIP standards and QoS
support, the latter being a requirement to run VoIP on your configuration.

4600 Series IP Telephones

The 4600 Series IP Telephones support either of two signaling protocol families - H.323 and
Session Initiation Protocol (SIP).
The H.323 standard, developed by ITU-T, provides for real time audio, video, and data
communications transmission over a packet network. An H.323 telephone protocol stack
comprises several protocols:
H.225 for registration, admission, status (RAS), and call signaling,
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H.245 for control signaling,
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Real Time Transfer Protocol (RTP), and
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Real Time Control Protocol (RTCP).
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Network Assessment
Issue 8 July 2008 33