I would to be on the safe side always include the trunk access code in front of the number.
LD 21
PRT
RDB
...
TIDY xxxx yyyy
xxxx = PBX Reference Number The xxxx default is
LSC as defined in LD 15, combined with route
access code truncated to four digits.
yyyy = Trunk Group Reference Number The yyyy
default is route number truncated to four digits.
Each of the two numbers can be one to four digits.
Prompted if Digital Private Network Signaling System 1
(DPNSS) package 123 equipped and SIGL not DPN.
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