Installation guide

Analyze Outbound Call Routing Routing Calls
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ShoreTel 14.2 Planning and Installation Guide 83
Analyze Outbound Call Routing
In general, you should have trunks at every site that support both outbound and inbound calling. The
following are general facts about outbound trunking:
 ISDN PRI provides the most feature-rich inbound and outbound calling experience.
This includes the support for Caller ID, DID, and DNIS. Caller ID Number is supported for both
inbound and outbound calls. Caller ID Name is supported only on inbound NI-2 trunks with the
exception of outbound calls to off-system extensions.
 SIP trunks can be used to place outbound calls.
 Analog wink-start trunks do not support outbound calls.
 You may want to purchase some analog loop-start trunks for emergency dial tone in case of total
power failure. For more information, see Analog Loop-Start Trunks (North America) on page 88.
 Calls can be automatically routed across your wide area network (WAN) using the Network Call
Routing feature. This allows users to access local and nearby area codes at one site from another
site.
 You need to plan for emergency calls, such as 911 in the United States, on your voice system.
The ShoreTel system supports all the necessary signaling for emergency calls. Refer to the
appendix on emergency 911 operations in the ShoreTel Administration Guide for information on
how to configure your system for emergency calls.
If your system uses three-digit extensions, ShoreTel recommends that you do not assign x11
extensions to users.
For more information, see Trunk Planning and Ordering on page 85 and Dialing Plan on page 103.