Specifications

Telephone Planning and Ordering
Planning and Installation Guide 8 – 3
Multi-line Phones
ShoreTel 6.1 offers extension monitoring from an IP phone. With this feature, an
administrative assistant or workgroup supervisor can monitor up to five system
extensions. The extension monitor feature can be enabled for ShoreTel IP phones from
the User edit pages of ShoreWare Director. For more information, see the ShoreTel 6
Administration Guide.
Teleworkers
Both analog and IP phones can be included in a ShoreTel 6.1 system as remote phones.
Analog phones require use of the Office Anywhere, while IP phones are supported by
setting an IP address range through ShoreWare Director.
Fax Machines and Modems
The ShoreTel 6.1 system supports fax machines and modems in the United States and
Canada (and not elsewhere).
Fax and modem calls are more sensitive to network problems than voice conversations.
The human ear does not notice a lost packet during a voice conversation, but when a
packet is lost during a fax transmission the line may be dropped. During a modem call,
a lost packet causes a retransmission. In the worst case, fax machines and modems will
not establish a connection or may drop the call altogether. In general, fax and modem
calls work across a local area network, but work on wide area networks only with
virtually no packet loss and little jitter.
The ShoreTel 6.1 system automatically detects both fax and modem tones, and boosts
the voice encoding to a higher value to increase throughput. (G.711 at 64 Kbps is
recommended.) It also stops the nonlinear processing of the echo canceller and fixes
the size of the jitter buffer to a preset level. In addition, for modems, the echo canceller
is frozen or stopped, since the modems use their own network echo cancellers.
Fax Machines
Fax machines require a high-quality IP network for proper operation.
The ShoreTel 6.1 system supports distinctive ringing for inbound calls: calls from
external parties have the classic single ring, whereas calls from internal parties have a
distinctive double ring. Some fax machines detect the ringing pattern before answering
and might not answer internal calls because of the distinctive ring pattern. In
particular, you must turn off the “Intelligent Ring Mode” on some Hewlett-Packard fax
machines to receive calls from internal parties.
Modems
The ShoreTel 6.1 system supports “moderate-use” modem applications on the system.
This is generally considered to be modem calls up to 28.8 Kbps that do not last longer
than 15 minutes. If your application demands greater performance, you should bypass
the ShoreTel 6.1 system or move your modem application to a pure IP-based solution.
The expected modem performance in different configurations is as follows:
• Analog connection speeds will not exceed 33.6 Kbps and could be lower. External
factors, including poor-quality trunk lines, ISP limitations, and multiple analog-
to-digital conversions in the network, can have a significant impact on connection
speeds.