GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual - Manual (Page 60)

PC Programming PL1877A Microprocessor Radio Telephone Interconnect
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Wildcard Access/Release
This provides a mobile user with the ability to create a unique access prefix each time a call is placed or
answered. This access prefix then becomes the required release suffix to disconnect the call.
This feature increases the level of security beyond that provided by the standard multi-digit
access/release feature. Since the standard multi-digit access and release codes are fixed, security is
limited by the number of mobile users who know the codes. For example, if the PL1877A is
programmed to require a multi-digit suffix from the mobile user, anyone who knows the required suffix
can cause disconnection of the conversation.
However, with wildcard access/release, it is unlikely that anyone will be able to disconnect a call except
the mobile user who originated it via the wildcard access prefix.
For example, suppose a mobile user accessed the PL1877A with the wildcard access code 1776 and then
the standard * access code. The user would be required to enter the same wildcard code to disconnect the
call (i.e., enter #1776; or 1776#, depending on whether the PL1877A is programmed for multi-digit
release prefixes or suffixes).
On the next call, the mobile user might use 1812* as the access code, so the same wildcard code (#1812
or 1812#) would need to be used to disconnect.
Notice that the mobile user used two entirely different access prefixes in each case above. In fact, the
user could enter a different prefix each time the PL1877A is accessed. Each time, the wildcard release
suffix (or prefix) must exactly match the wildcard access prefix.