[cisco-voip] RP Wildcards A,B,C,D

[Fred Nielsen]

A, B, C and D are valid DTMF "digits" with their own tones... imagine
another column of four more keys on the right hand side of your existing
keypad with A - D running top to bottom.  This column has its own tone in
the "Dual-Tone Multiple Frequency" setup, and uses the same row tone as that
used by the digits you are already familiar with, combined to make a
dual-tone like every other digit.
 
They were principally used on the U.S. DOD AUTOVON private telephone network
to signal priority.  A call preceded by an A (flash override, the highest
priority) would preempt any calls on congested trunks with lower priorities.
The remaining three digits represented lower levels of priority, and a call
with no digits preceding was deemed "routine" with the lowest priority of
all.  Telephone carriers companies used to also use them for various signal
indications back when analog trunks were still fairly prevalent.
 
Sometimes you will see technician buttsets with A-D keys on them still.
Kinda neat.
 
-- Fred Nielsen

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From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Lelio Fulgenzi
Sent: Friday, November 03, 2006 1:51 PM
To: Howard, Chad; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] RP Wildcards A,B,C,D


someone told me once they are used in military communications. top secret
stuff i guess.
 
----------------------------------------------------------------------------
----
Lelio Fulgenzi, B.A.
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
"I can eat fifty eggs." "Nobody can eat fifty eggs."

----- Original Message ----- 
From: Howard,  <mailto:Chad.Howard at ecolab.com> Chad 
To: cisco-voip at puck.nether.net 
Sent: Friday, November 03, 2006 4:08 PM
Subject: [cisco-voip] RP Wildcards A,B,C,D

Anyone know what the route pattern wildards A, B, C, D are used for ?
 
The docs I've found so far say they're valid characters, but they aren't
listed in the wildcard explanations.
 
Thanks.
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