Installation guide

88 Planning and Installation Guide ShoreTel 14.2
Trunk Planning and Ordering Analog Loop-Start Trunks (North America)
5
Analog Loop-Start Trunks (North America)
Analog loop-start trunks are typically used for inbound calls to a main telephone number that are
directed to an auto attendant menu, company operator, or workgroup. A caller can route a call from the
auto-attendant to a user extension by entering the extension number or by spelling the user’s name
from the telephone keypad. Analog loop-start trunks are also used to make outbound calls.
Analog loop-start trunks support the following:
 Inbound calls
 Outbound calls
 Caller ID number
 Caller ID name
 Caller ID blocking
Analog provisioning is provided by the loop-start protocol and Dual-Tone Multi-Frequency (DTMF)
signaling.
Analog loop-start trunks are used to provide power-fail transfer to selected telephones — for instance,
to the operator, security station, executives, and so on. When there is a complete power failure,
including loss of UPS power backup, power-fail transfer connects a specified trunk port to a specified
extension port. This power-fail transfer ability provides a dial tone for making and taking critical calls in
the event of power failure. Refer to the ShoreTel System Administration Guide for more information
about the power-fail transfer port on each ShoreTel Voice Switch that supports this feature.
Centrex lines are analog lines that can be used as analog loop-start trunks. Your organization may
already have these installed, and want to use them instead of ordering new loop-start trunks. If you
have Centrex lines and do not want to change your primary company telephone number, you can keep
Centrex lines. Centrex lines support Caller ID. Be sure to remove the Centrex features, including call
waiting, call forward, and voice mail.
EMEA analog loop start trunk support, based on the TBR 21 standard, is supported on all 1U Half
Width ShoreTel voice switches. BT type 1, or on hook, caller ID support is based on SIN 227 and SIN
242 standards in the UK.
ShoreTel E1 No No No No No No Yes No No
ShoreTel T1 No No Yes No Yes Yes No No No
Table 19: Supported Trunk Types(Continued)
Voice Switch
Analog
Loop-Start
(North.Amer.)
Analog
Loop-
Start
EMEA
Digital
Loop-
Start
Analog
Wink-
Start
Digital
Wink-
Start
T1
PRI
E1
PRI
SIP BRI