Avaya IP Office Phone Manager, Installation Manual, Page: 56 / 411

IP Office Installation Page 55
15-601042 Issue 20b (16 July 2009) IP Office
System Overview: Application DVD's
2.29 VoIP
The IP Office is a converged telephony system, that is it combines aspects of traditional PABX telephone systems and IP
data network systems. This works at various levels.
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Individual phone users can control the operation of their phone through applications running on their PC.
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Data traffic can be routed from the LAN interface to a telephony trunk interface, for example a dial-up ISP connection.
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Voice traffic can be routed across internal and or external data links. This option is referred to as voice over IP (VoIP).
The VoIP mode of operation can include IP trunks between customer systems and or H.323 IP telephones for users. In
either case the following factors must be considered:
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The IP Office control unit must be fitted with voice compression channels. These channels are used whenever a IP
device (trunk or extension) needs to communicate with a non-IP device (trunk or extension). See
Voice Compression
Channels .
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A network assessment is a mandatory requirement. For support issues with VoIP, Avaya may request access to the
network assessment results and may refuse support if those are not available or satisfactory.
A network assessment would include a determination of the following:
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A network audit to review existing equipment and evaluate its capabilities, including its ability to meet both current and
planned voice and data needs.
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A determination of network objectives, including the dominant traffic type, choice of technologies, and setting voice
quality objectives.
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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, DHCP, TFTP and jitter buffers in H.323 applications.
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An outline of the expected network assessment targets is:
Test Minimum Assessment Target
Latency Less than 150ms.
Packet Loss Less than 2%.
Duration Monitor statistics once every minute for a full week.