Planning and Installation Guide Chapter 5: Trunk Planning and Ordering
68
5.3.1 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:
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 Appendix G,
starting on page 303, for the power-fail transfer port on each ShoreGear 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.
Voice Switch
Analog
Loop-
Start
(N.Am.)
Analog
Loop-
Start
(EMEA)
Digital
Loop-
Start
Analog
Wink-
Start
Digital
Wink-
Start
T1
PRI
E1
PRI SIP BRI
ShoreGear 90 Yes Yes No Yes No No No Yes No
ShoreGear 90BRI No No No No No No No Yes Yes
ShoreGear 50 Yes Yes No Yes No No No Yes No
ShoreGear 30 Yes Yes No Yes No No No Yes No
ShoreGear 220E1 No No No No No No Yes Yes No
ShoreGear 220T1 No No Yes No Yes Yes No Yes No
ShoreGear 220T1A Yes No Yes No Yes Yes No Yes No
ShoreGear T1k No No Yes No Yes Yes No No No
ShoreGear 120 Yes No No Yes No No No Yes No
ShoreGear 60 Yes No No Yes No No No Yes No
ShoreGear 40 Yes No No Yes No No No Yes No
ShoreGear E1 No No No No No No Yes No No
ShoreGear T1 No No Yes No Yes Yes No No No
Table 5-2 Supported Trunk Types
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