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TUCoPS :: Phreaking Boxes Blue, Green :: routing.txt

Blue Box: AT&T/BOC Routing Codes

At&t/BOC Routing Code

The following is a list of routing codes used by AT&T and Bell Operating
Companies (BOC) that you can blue box to. Most codes are used by dialing
KP+NPA+XXX+ST where XXX= the code, except where noted. There are notes
attached after this list. Codes marked with a ? are unfamiliar to us.

000 -      The Rate Quote System (RQS) (1)
001 - 005  Spare (2)
006 - 008  Reserved (3)
009        RQS
010        Reserved
011        International Origination Toll Center (IOTC) (15)
014        TWX Switching Plan (Canada) (?)
015 - 071  Spare
072 - 079  Reserved
080 - 081  Spare
082 - 087  Reserved
088        Spare
089        Reserved
090 - 099  Spare
100        Plant Test - balance termination
101        Plant Test - test board
102        Plant Test - Milliwatt tone (1004 Hz)
103        Plant Test - signaling test termination
104        Plant Test - 2-way transmission and noise test
105        Plant Test - Automatic Transmission Measuring System /
           Remote Office Test Line (ROTL)
106        Plant Test - CCSA loop transmission test
107        Plant Test - par meter generator
108        Plant Test - CCSA loop echo support maintenance
109        Plant Test - echo canceler test line
110 - 119  Operator Codes
      115  Operator Leave Word
      116  Inward DA
120        Network Emergency Center (?)
121        Inward Operator (9)
122        AT&T Ready line INWATS (4)
123 - 130  Reserved
131        Directory Assistance
132 - 137  Reserved
138        IDDD for Equal Access (7)
139 - 140  Reserved
141        Rate and Route (10)
142 -147   Reserved
148        points not on an NPA - Hermosillo, Mexico (5)
149        Reserved
150        Cable Control (Satellite Avoidance) - Hawaii (5)
151        International Assistance
152 - 157  Reserved
158        Operator Assistance for Equal Access (7)
160        International Operator Center (IOC) (6)
161        Trunk Trouble Reporting
162 - 167  Reserved
168        points not on an NPA - Grenada
169 - 170  Reserved
171        points not on an NPA - Monterey, Mexico
172        points not on an NPA - Dominican Republic, Puerto Rico,
           Virgin Islands (Canada only)
173        Reserved
174        Cable Control (Satellite Avoidance) Caribbean
175        Reserved
176        points not on an NPA - Mexicali, Mexico
177 - 178  Reserved
179        points not on an NPA - Grenada
180        points not on an NPA - Mexico Numbers
181        Toll Station
182        International Switching Center (ISC) White Plains, 5 (14)
183        ISC New York, BW24
184        ISC Pittsburgh
185        ISC Atlanta OLT
186        ISC Sacramento
187        ISC Denver/Sherman Oaks (?) (15)
188        ISC New York, 5450
189        points not on an NPA - Mexico City, Mexico
190        points not on an NPA - Mexico Numbers
191        Conference loop around
191        AT&T Advanced 800 intercept recording frames (4)
192        Reserved
193        Cable Control (Satellite Avoidance) - Grenada
194        points not on an NPA - Tijuana, Mexico
195        AT&T Advanced 800 (4)
196        AT&T International 800 (4)
197        Reserved
198        AT&T International City Service Center (ICSC)
199        Cable Control (Satellite Avoidance) - Alaska
199        AT&T USA Direct (4)

4 or 5 digit codes (8)

1150,11501 Universal or Coin Callback
1151,11511 Conference Operator (11)
1152,11521 Mobile Service / Air-Ground
1153,11531 Marine Service (12)
1154,11541 Toll Terminal
1155,11551 Time and Charges callback
1156,11561 Hotel / Motel callback
1157,11571 IOTC access trunk
1158,11581 Inward- completion assistance (BOC)
1159,11591 Inward- busy line verification (BOC)
1160,11601 Calling Card Validation - dial pulse equipment (13)
1161,11611 Calling Card Validation - DTMF equipment
1162,11621 Calling Card Validation - MF equipment


  1. The Rate Quote System is a voice response system used by operators to
     obtain routing information. The system, now being phased out, was used
     as an alternative to calling the Rate and Route operator. Operators
     would key-in required routing information and a synthesized voice
     would respond. Though the RQS is still operational, operators now
     obtain routing information from COMPIS (See note 10).

     KP+DD+ONPA+NXX+TNPA+NXX+ST to get the "rate step" for:

        DD = 00 Now
        DD = 01 Day Call     (08:00-17:00)
        DD = 02 Evening Call (17:00-23:00)
        DD = 03 Night Call   (23:00-08:00)

     KP+04+? Something with Mexico, unclear.

     KP+05+NPA+NXX+ST Gives the routing for a BOC inward (See note 9)

     KP+06+NPA+NXX+ST gives the routing for for an AT&T inward operator
     (See note 9)

     KP+07+XXXXXXX+ST Reads back the numbers you just typed

     KP+08+? Something with Enterprise and Zenith numbers, unclear.

     KP+09+NPA+NXX+ST Gives you the current time for the area and exchange
     just dialed.
  2. When a code is marked spare, that means that there is no current or
     planned networkwide usage. It still may be utilized as a non-standard
     POTS exchange for WATS service by local companies.
  3. When a code is marked reserved, it means that there may be planned
     networkwide usage.
  4. This code is used by an AT&T custom service. It may be thought of as
     acting like a special area code and takes the following dialing
     format: KP+XXX+YYY+YYYY+ST where XXX is the code in question and Y can
     be any number 0-9.
  5. All "points not on an NPA" and "Cable Control" function as pseudo area
     codes and are followed by a telephone number.
  6. Calls to the IOC are dialled as follows: KP+160+CCC+ST CCC=Country
     Code (i.e. 044 or 144 for the UK).
  7. These are special codes used with Equal Access. They are as follows:

     KP+138+PIC+ST then KP+CC+cc+xxxxx+ST KP+158+PIC+ST

     Where PIC is the primary carrier code, CC is the country code and cc
     is city code. xxxxx is subscriber number. We are not sure exactly when
     and where these are used.
  8. All four and five digit codes are dialed as follows: KP+NPA+XXXX+ST or
     KP+NPA+XXXXX+ST. Keep in mind that not every code is in use in every
  9. The format for an AT&T inward is usually KP+NPA+121+ST -- In some
     small cities there is an extra code used called a Terminating Toll
     Centre (TTC) or sometimes just a city code. If a TTC is used, the
     format is KP+NPA+TTC+121+ST. To get an inward with most BOCs you dial
     KP+NPA+11591+ST but there are some which use a format of
     KP+NPA+TTC+121+ST. To get the inward routing for a particular
     exchange, use the Rate Quote System (RQS).
 10. The number for Rate and Route was 800+141+1212 but this was
     discontinued sometime last year (1987) when the TSPS operators got a
     computer terminal called COMPIS. In each there is an inward which acts
     like a Rate and Route operator. In New York it is 716+121.
 11. With the advent of Alliance Teleconferencing, use of the conference
     operator dwindled. There are currently four operator handling
     conferences. They are as follows: Atlanta 404+11511, Minneapolis
     507+11511, New York 212+11511 and Oakland 415+11511. 800-225-0233
     translates to the conference operator closest to you.
 12. The Marine Operator is used in calling ships that are close to the
     United States. There is an operator called the "High Seas" operator
     who can be reached by dialing 800-SEA-CALL (800-732-2255). The High
     Seas operator is a service of AT&T, while Marisat is an independent
     company. A High Seas call can go to any ocean for $14.98 for the first
     3 minutes and $4.98 for each additional minute. A Marisat only to
     three oceans and costs $10 a minute.
 13. 116X and 116XX are used to verify an AT&T Calling Card number. You
     dial KP+NPA+116XX+ST when you hear a "bong" you dial the calling card
     number. If you use 11611 you enter the number in Touch Tone and if you
     use 11621 you enter the card number in MF using KP and ST.
 14. These ISC codes are used to provide alternate routing for
     electro-mechanical switches. Some older electro-mechanical switches,
     for example #5 Crossbar (5XB) cannot outpulse 011+CCC (CCC=Country
     Code) for international dialing. AT&T has set up these special codes
     to handle international calls. A 5XB can dial KP+18X+ST. They would
     then receive a wink (short blast of 2600 Hz) and would proceed to dial
     the country code and number. If you want to make an international call
     you dial KP+(NPA)+18X+ST where the NPA is optional. After the wink
     dial the country code, city code and number. The "," after the city
     name is the switch number if there is more then one 4-ESS in that
 15. The 187 code was assigned to Atlanta until up to the end of February
     1988. AT&T is in the process in routing the calls to the Sherman Oaks
     Office in California.
 16. To make international calls dial KP+011+CCC+ST where CCC is the
     country code; and then dial KP+CC+XXXXXXX+ST where CC is the city code
     and XXXXXXXX is the telephone number.

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