Chapter 5: Trunk Planning and Ordering Reviewing and Selecting Trunk Types
ShoreTel 8 Planning and Installation Guide 57
EMEA analog loop start trunk support, based on the TBR 21 standard, is supported on all
1U Half Width ShoreWare voice switches. BT type 1 (on hook) caller ID support is based
on SIN 227 and SIN 242 standards in the UK.
5.3.2 Analog Loop-Start Trunks (EMEA)
Analog Loop-Start trunks are supported in Europe, the Middle East, and Africa, and are
based on the TBR 21 standard.
Analog Loop-Start Trunks (EMEA) 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 (EMEA) support:
Inbound calls
Outbound calls
BT type 1 (on hook) caller ID support is based on SIN 227 and SIN 242 standards
in the UK.
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, the ShoreGear switches provides
power-fail transfer. Refer Refer to Appendix G, starting on page 303, for the power-fail
transfer port on each ShoreGear switch that supports this feature. This power-fail transfer
ability provides a dial tone for making and taking critical calls in the event of power failure.
Centrex lines are analog lines that can be used as analog loop-start trunks on the ShoreGear
switches. 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.
5.3.3 Digital Loop-Start Trunks
Digital loop-start trunks are typically used for inbound calls to the 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. Digital loop-start trunks are also
used to make outbound calls.
Digital loop-start trunks support:
Inbound calls
Outbound calls
Caller ID number
Caller ID name
Caller ID blocking
Digital provisioning is provided by the loop-start protocol and Dual-Tone Multi-Frequency
(DTMF) signaling. ShoreGear switches support
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