Mitel Inter-Tel 5000, Installation And Maintenance Manual

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Chapter 4: Specifications
IP Network Requirements
Inter-Tel
®
5000 Installation Manual – Issue 2.4, May 2008
Page 4-53
IP Network Requirements
This section provides a brief technical overview of data network characteristics that will help to
minimize faulty operation of the Inter-Tel 5000 platform. For additional technical details and
applicable procedures designed to promote an adequate IP network environment, see
Inter-Tel Private Networking and Network IP Topology appendices in this manual.
Network Capability Analysis
Because the Inter-Tel IP devices use IP to connect to other IP devices, the data network must
meet certain specifications that support an adequate VoIP network. This section summarizes
adequate network requirements.
Run the Network Qualifier for at least 24 hours to assess the network before purchasing or
installing the hardware required to set up voice over IP. The Network Qualifier application
supports up to eight simulated VoIP connections and is available on the Inter-Tel Web site
(www.inter-tel.com) and on the system software CD.
Performance Criteria
The acceptable quality of an IP telephone call depends on the adequacy of the data network
through which it travels. Network adequacy for VoIP transmission includes the speed and
capacity of the network configuration, type of connection, routing scheme, and amount of
network traffic.
Inter-Tel requires that its business-based VoIP products and solutions be used only on data
networks that meet the near toll quality and business communication quality criteria outlined in
this section. Successful VoIP platform deployment requires installation in a correctly
provisioned, configured, and tuned data network.
For both near toll quality and business communication quality levels, the available network
bandwidth/capacity should provide approximately 32 kbps per call using the G.729 vocoder and
approximately 86 kbps using the G.711 vocoder. These capacity values are based on a 30 ms
packetization interval.
Inter-Tel recommends the following network parameters as measurable performance criteria for
an adequate VoIP network:
•
Network Packet Loss : The percentage of uniformly distributed data packet loss
(nonburst). For near toll quality service, uniformly distributed data packet loss should not
exceed 1 percent. For business communication quality service, uniformly distributed data
packet loss should not exceed 3 percent.
•
Network Delay : The data network delay between two peer-to-peer network devices. For
near toll quality service, one-way delay (UDP–User Datagram Protocol–traffic) should not
exceed 80 ms, assuming all jitter buffers are set to accommodate 40 ms maximum jitter
level. For business communication quality service, one-way delay (UDP traffic) should not
exceed 120 ms, assuming all jitter buffers are set to accommodate 80 ms maximum jitter
level.
NOTICES
The following notices apply to the network capability:
•
Network security is the responsibility of the customer’s network administrator. Inter-Tel is
not responsible for network problems due to security violations involving the IP address
of the Inter-Tel IP devices. This includes, but is not limited to, toll fraud and interrupted
network service.
•
Due to the volatility in delay, jitter, and packet loss, sending VoIP traffic over the Internet
may result in intermittent poor voice quality, dropped calls, and equipment resets. No
delivery guarantee can be made for VoIP traffic over the Internet.