I
`
`United States Patent [191
`Comella et al.
`
`n 11
`[45]
`
`4 054 756
`9
`9
`Oct. 18, 1977
`
`[54] METHOD AND APPARATUS FOR
`AUTOMATING SPECIAL SERVICE CALL
`HANDLING
`.
`[75] Inventors: will“!!! Kirk Comenl, NaPervllle,
`111.; Bernard Julius Yokelson,
`Mendham Township, Morris
`County, NJ-
`[73] Assignee: Bell Telephone Laboratories,
`Incorporated, Murray Hill, N].
`6
`_ N v:
`1
`[2 1 A‘ppl o "7'7 7
`[22] Filed:
`Sept. 29, 1976
`[51] Int. cm .................... .. H04M 3/42; H04M 17/00
`[52] u.s.c1. ............................. .. 179/111 B; 179/63 R
`[58] Field of Search ............. .. 179/18 B, 27 FF, 7.1 R
`
`[56]
`
`2 676 209
`
`,
`
`,
`
`2,761,900
`3,175,039
`
`References Cited
`Us PATENT DOCUMENTS
`4/1954 J 1
`
`"9/6 3|
`
`oe ................................... ..
`
`.
`
`179/63 R
`9/1956 Joel ........ ..
`3/1965 Wilbourn ...................... .. 179/7.l TP
`
`Miller et al. .................... .. l79/7.l R
`7/ i968
`3,394,229
`7/1969 Shaer
`l79/7.l R
`3,453,389
`Pf
`E _
`w“. C C
`imary xammer— 1 1am . ooper
`Attorney, Agent. or Firm-—Martin S. Landis; John C.
`Mbmcht
`
`ABSTRACT
`[57]
`A system is disclosed for serving special service calls
`such as collect, person-to-person and charge-to-third
`number on a wholly automatic basis without any opera
`tor intervention normally being required. The system
`requests speci?c information from the calling party
`suchPsohhismh" PM“; f°’°""‘°‘.°““s'fa“d ‘.“llizes ‘he
`'°°°"’
`answersh'n‘f c '°f,’““1“"°¥‘ ° addmm‘al a’.“
`“°““°e‘.“e“‘s l‘“ e cf‘ned sl‘bsmber- The system ‘5
`responsive to lnforrnation received from the called sta
`tion or third party station for instituting billing for the
`requested call after a connection is established between
`the calling and called stations.
`
`19 claiml, 24 Drawing Figures
`
`SSAS
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`US. Patent
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`Oct. 18, 1977
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`Oct. 18,1977
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`U.S. Patent
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`Oct. 18, 1977
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`U.S. Patent
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`Oct. 18, 1977
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`U.S. Patent Oct. 18, 1977
`
`Sheet 12 of 16
`
`4,054,756
`
`SPC
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`FIG. 15
`
`SPECIAL TOLL CALL (04)
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`1
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`

`

`US. Patent Oct. 18, 1977
`
`Sheet 13 of 16
`
`4,054,756
`
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`MAINTENANCE
`C)
`TlsMsEAsAwéAégmG
`RERW
`
`TIME OUT
`
`REPLY
`FROM
`SSAS
`
`DISCONNECT
`ARTTR
`@
`
`Z
`
`

`

`US. Patent Oct. 18, 1977
`
`Sheet 14 of 16
`
`4,054,756
`
`FIG. /7
`
`PC @
`
`RESTORE ‘ARTTR T0
`IDLE LINK LIST
`
`FIG. /8
`
`S
`IDLE ARTTR ““'©
`
`CONNECT OUTPULSER
`TO TRUNK (T21
`FORWARD CALL
`I
`CUT THROUGH TRUNK
`
`CALLING
`CUSTOMER HEARS
`CALL SETUP
`AUDIBLE RING.
`BUSY, INTERCEPT
`ANNOUNCEMENT,
`NETWORK CONGESTION
`ANNOUNCEMENT, ETC
`
`FIG. /9
`
`%)
`DISCONNECT
`ARTTR
`
`CONNECT POSISTION
`TO TRUNK (Tl)
`
`CUT THROUGH TRUNK
`
`

`

`US. Patent Oct. 18, 1977
`
`Sheet 15 of 16
`
`4,054,756
`
`SSAS
`
`FIG. 20
`
`ANNOUNCE
`"ALERUNG TONE"
`
`‘____-
`
`____ __ SPECIAL TOLL CALL
`INITIAL SEIZURE
`CUSTOMER INSTRUCTIONS REQUEST
`THAT CUSTOMERS SIGNAL
`TYPE OF CALL INDICATION
`WITH TOUCH TONE PAD UPON
`RECEIPT OF ALERTING TONE
`
`PERIODICALLY SCAN
`ARTTR UNTIL 2
`TT mans RCVD
`
`DIGITS
`INDICATE TYPE
`OF CALL
`
`_ DIGITS=I3
`_.
`H DIGITS=I2
`L
`___DIGITS=II
`PERSON
`COLLECT CALL
`SEND REPLY To
`SEND REPLY TO
`SPC TYPE OF CALL "T@ 5% TYPE OF CALL "\Q)
`I,
`REPLY
`I
`REPLY
`ASSIGN MEMORY
`FFs‘gM
`ASSIGN MEMoRY
`FRgM
`AREA FOR RECORDING
`5 5
`AREA FOR RECORDING
`55 5
`
`g?ff
`
`ANNOUNCE "AT THE TONE
`PLEASE STATE YOUR
`NAME""TONE"
`
`BASE ADDRESS T0
`RSRYADD 400
`AMDEkME‘RESMEIEg PTR
`'
`
`REPLY
`
`ANNOUNCE "AT THE TONE
`PLEASE STATE THE
`NAME OF THE PERSON
`T0 wHoM YOU WISH
`TO SPEAK" "TONE"
`I
`
`l__
`ANNOUNCE "AT THE TONE PLEAsE DIAL THE
`AREA CODE AND THE NUMBER TO
`WHICH YOU wIsH" "To CHARGE
`THIS CALL TONE
`
`SEND REPLY To SPC L i
`IO U DIGITS RCVD
`I
`RECORDING COMPLETE ‘@ REPLY
`PERIODICALLY SCAN ARTTR UNTIL
`-
`FROM
`I
`SSAS
`@A SEND REPLY TO SPC T PE
`“ OF CALL I0 men 1:
`
`ASSIGN MEMoRY
`AREA FOR RECORDING
`
`ANNOUNCE llAT THE TONE PLEASE
`STATE YOUR NAME" "TONE"
`
`REPLY FROM SSAS
`\_ _
`GD" _
`
`BASE ADDRESS TO RSR,ADD 400 AND
`INCREMENT PTR EACH .5 SEC
`I
`SEND REPLY TO SPC
`RECORDING COMPLETE
`
`

`

`US. Patent 0m. 18, 1977
`
`Sheet 16 of 16
`
`4,054,756
`
`FIG. 2/
`
`COLLECT
`ANNouNcE "THIS
`Is A COLLECT
`cALL FROM-—|F
`YOU ACCEPT THE
`CHARGES DIAL 97.
`IF YOU wILL
`NOT ACCEPT
`THE CHARGES
`DIAL 66"
`
`lPERsoN
`ANNOUNCE "THIS
`Is A PERsoN
`T0 PERsoN CALL
`FOR MN I
`
`lFTléggg JONéQNES5
`
`DTAZ
`
`Is
`DIAL as"
`
`lcRAReE 3rd’;
`ANNouNcE"—
`WISHES TO CHARGE
`A CALL TO
`NBA-NNX-XXXX
`(CALLED #1 TO THIS
`NuNDERIF You ACCEPT
`THE CHARGES DIAL 91,
`IF YOU wILL NOT ACCEPT
`THE CHARGES DIAL 66"
`
`PERIDDIcALLY SCAN
`ARTTR UNTIL 2
`TT DIGITS RcvD
`
`sEND DIGITS
`TO SPC *‘“@
`
`FIG. 22
`SSAS
`
`FIG. 23
`ssAs
`
`FIG. 24
`SSAS
`
`ABORT
`___ CALL
`IDLE
`ARTTR
`
`sILENcE
`ANNOléIéggMENT
`REGISTER
`
`SEND REPLY
`TO SPC
`CIRCUIT Is
`I D
`
`ANNOUNCE
`.I YOUR CALL
`WAS NOT H
`ACCEPTED
`
`sEND REPLY
`TO SPC
`END
`ANNOUNCEMENT
`
`I (b
`
`ANNOUNCE
`JINAMEH
`
`sEND REPLY
`TO SPC
`END
`ANNOUNCEMENT
`
`(D
`
`

`

`BACKGROUND OF THE INVENTION AND
`PRIOR ART
`
`FIELD OF THE INVENTION
`This invention relates to telecommunication systems
`and, more speci?cally, to systems for serving, on an
`automated basis, special service calls originating from
`either coin pay stations or normal telephone stations.
`
`4,054,755
`1
`2
`METHOD AND APPARATUS FOR AUTOMATING
`The above two prior art systems suffer from the dis
`SPECIAL SERVICE CALL HANDLING
`advantage that the initial recorded portions of the call
`must be screened to detect fraudulent use of the tele
`phone system. It is believed that such screening is not
`amenable to automation and thus telephone personnel
`must manually screen the calls. Moreover, even when a
`fraudulent call is discovered during the screening, it is
`still very dif?cult and expensive to collect the proper
`billing for the call. For example, on calls from one coin
`station to another coin station, it is virtually impossible
`to collect revenue for such calls because the true identi
`ties of both the calling and called subscribers are often
`unknown.
`These prior art special service systems suffer from a
`further disadvantage in that the calling station indicates
`whether or not another station, normally the called
`station, will accept charges for the call. Thus, an un
`scrupulous calling party can force an unwilling called
`party to be billed foran unwanted call.
`It is an object of this invention to fully automate the
`processing of special service calls.
`It is a further object of this invention to provide such
`automation without requiring the recording of the ini
`tial conversation which must be later screened to detect
`fraudulent use of the telephone system.
`It is a still further object of this invention to allow
`only the party to whom a special service call is to be
`billed to indicate whether or not the charges for the call
`are accepted. For a person-to-person call, the calling
`party indicates, by instituting the call, the acceptance of
`charges upon answer by the speci?ed party.
`SUMMARY OF THE INVENTION
`
`20
`
`35
`
`40
`
`When telephone service was ?rst provided on a com
`mercial basis during the latter part of the last century,
`all telephone calls were completed manually by an op
`erator. An operator responded to a calling signal,
`learned the identity of the called subscriber, and then
`utilized a plug and jack connector to interconnect the
`calling and called stations. Sometime after the invention
`of the telephone, a trend began toward the automation
`of telephone switching. First a crank and buttons were
`added to the subscriber station and then later a dial was
`added. More recently, direct distance dialing has been
`instituted which allows a calling subscriber to directly
`dial most long distance calls in this country and to many
`foreign countries without operator intervention.
`In addition to automating long distance calling, sev
`eral systems have been proposed for completely auto
`mating the handling of calls instituted from coin sta
`tions. These arrangements generally include announce
`ment machines for indicating to the calling coin cus
`tomer the amount of money to be deposited, and also
`include coin detectors for detecting signals originated at
`the coin station, which signals represent the deposit of
`speci?c coins thereat. One recent automated coin ar
`rangement is described in R. M. Dudonis application
`Ser. No. 689,600, ?led May 24, 1976.
`Several arrangements have also been proposed for
`automating special service calls including person-to
`person, collect, credit card, and bill-to-third party. Spe
`cial service calls are difficult to automate because of the
`different variations in each call type and the need for
`substantial interaction between the various parties.
`One prior art system for automating special service
`calls is disclosed in H. R. Wilbourn, In, US. Pat. No.
`3,175,039, issued Mar. 23, 1965. In this system, the call
`ing subscriber dials a pre?x code to gain access to an
`announcer unit which plays back a recorded message
`giving special instructions for completing the requested
`call. After the call is automatically completed to the
`called station, the calling party indicates whether the
`requested service has been provided and thereby con
`trols the institution of billing for the call. To detect
`unscrupulous users who may use the initial contact
`interval to converse with the called station, a recording
`is made of all conversation or other signals conveyed
`over the connection prior to the receipt of a “starting
`billing” signal from the calling subscriber.
`Another prior art system disclosed in T. P. Miller et
`al, US. Pat. No. 3,394,229, issued July 23, 1968 im
`proves upon the abovedescribed Wilbourn system in
`that the voice recording which is made from the institu
`tion of the special service call to the start of the billable
`portion of the call is retained on a permanent basis only
`if there is a question as to whether the call is billable.
`Thus, ifa start billing indication is not received within
`a predetermined interval after the institution of a call,
`then and only then is the initial voice conversation re
`tained.
`
`In accordance with the principles of our invention,
`special service calls such as collect, person-to-person,
`and charge-to-third number are processed by a wholly
`automated system utilizing a generic approach which
`allows the same equipment to be utilized in processing
`each of these special service call types. To elaborate, at
`the beginning of a call, the calling subscriber identi?es
`the type of special service call requested by dialing
`additional digits. The automated system, upon deter
`mining the type of service requested, then generates an
`appropriate announcement for the calling party. For a
`collect call or for a bill-to-third-number call, the an
`nouncement requests the name of the calling subscriber,
`and for a person-to-person call the announcement re
`quests the name of the person to whom the call is di
`rected. Also for a bill-to-third-number call, the an
`nouncement requests the calling party to dial the num
`bers identifying the third station. The system records
`and stores the answer(s) received from the calling sub
`scriber and utilizes the answer(s) in formulating another
`announcement which is conveyed to either the called
`station or to the third party station depending upon the
`type of call. For example, for a collect call the system
`generates a typical announcement for the called station:
`“This is a collect call from John Jones, if you accept the
`charges, dial 97. If you will not accept the charges, dial
`66.” The answer previously received from the calling
`station (e.g., John Jones) was automatically inserted
`after the word "from" in the above announcement. For
`a person-to-person call, the announcement indicates, for
`example, “This a person-to-person call for -———. If -—
`is there, dial 97, and if ——~— is not there, dial 66." For a
`charge-to-third-number call, an announcement indi
`cates,“ -——- wishes to charge a call to —-— (called
`number) to this number. If you accept the charges, dial
`
`45
`
`55
`
`65
`
`

`

`0
`
`4,054,756
`4
`3
`which normally controls the addressing of memory
`97, if you will not accept the charges, dial 66.” In each
`ASTRO;
`of the above announcements, the blanks are ?lled with
`FIG. 7 illustrates the ac transmission of serial an
`answers received from the calling station responsive to‘
`nouncement words to the announcement circuits and
`other announcements directed thereto.
`the ac transmission of encoded speech signals from the
`The system is responsive to the digits received from
`announcement circuits to memory;
`the called station or third party station (i.e., 66 or 97) for
`FIG. 8 illustrates the circuitry in the announcement
`either terminating the call or completing the call. Thus,
`circuits;
`billing for a particular call is only instituted responsive
`FIG. 9 illustrates the manner in which address infor
`to an indication from the station to which the call is to
`mation is serially conveyed to the coin tone detectors
`be billed that the call has been accepted. However, for
`and digit receivers to selectively interrogate these de
`a person-to-person call, billing is instituted against the
`tectors and receivers;
`calling station upon receipt of an indication from the
`FIG. 10 illustrates the circuitry associated with the
`called station that the requested party is available.
`coin tone detectors and digit receivers;
`Moreover, the calling and called subscriber or third
`FIG. 11 illustrates the manner in which FIGS. 5-10
`party subscriber cannot freely communicate with each
`are to be arranged;
`other while the call is being established. This prevents
`FIG. 12 illustrates how “real-time" is divided into
`fraudulent use of the automated system prior to the
`time frames and time slots. Each announcement circuit
`institution of billing.
`is serviced during an assigned time slot;
`In accordance with one illustrative embodiment of
`FIG. 13 illustrates how a digital bit stream encoded in
`20
`our invention, the automated coin system disclosed in
`an adaptive delta modulated format is first decoded and
`the above-mentioned Dudonis application is modi?ed to
`then ?ltered to generate audible speech;
`operate in accordance with the principles of our inven
`FIG. 14 illustrates the manner in which FIGS. 3 and
`tion. More speci?cally, an encoder converts speech
`signals, received from the calling station in response to
`4 are to be combined;
`FIGS. 15 through 19 show in the form of a ?ow
`the questions directed thereto, into a digital form which
`chart, the sequential operations performed by the SPC
`is then stored in a memory. This stored speech informa
`in FIG. 1 to handle special service calls in this one
`tion is later retrieved from the memory and utilized in
`illustrative embodiment of the invention; and
`formulating messages which are applied to the called
`FIGS. 20 through 24 illustrate in the form of a flow
`and third party stations.
`chart, the operations performed by the programmable
`In accordance with one feature of our invention,
`controller PC in FIG. 1 in cooperation with the SPC to
`special service calls are processed on a fully automated
`handle these special service calls on a fully automated
`basis in which information requested of the calling sta
`basis.
`tion is utilized in formulating announcements directed
`to the other stations.
`In accordance with another feature of our invention,
`special service calls are provided on an automated basis
`in which the party to whom a call is to be charged
`indicates the acceptance or nonacceptance of the call,
`except person-to-person calls.
`As a still further feature of our invention, such an
`automated system also includes coin detector means for
`handling special service calls instituted from calling
`coin stations.
`
`30
`
`1.0 GENERAL DESCRIPTION
`FIG. 1 illustrates in block diagram form the manner in
`which a Special Servic Announcement System (SSAS)
`is added to an existing TSPS office to automate special
`service calls in accordance with the principles of our
`invention. The TSPS is comprehensively described in
`R. J. .laeger, Jr. et al. US. Pat. No. 3,484,560, issued
`Dec. 16, 1966, and also in the Dec. 1970 issue of the Bell
`System Technical Journal.
`1.1 Prior Art TSPS System
`With the advent of TSPS, many of the functions pre
`viously performed by an operator at a cordboard were
`automated. More speci?cally, a customer at a coin sta
`tion CS would make an initial deposit and then dial a I
`followed by 7 or 10 digits. The local office LO routes
`the call to a TSPS trunk TRKI and down conductors
`T1 to the TSPS network NET. Stored program con
`troller SPC, which is a duplicated processing unit for
`performing arithmetical and logical functions on data in
`accordance with its stored program, controls network
`controller NTC to establish connection P1. The local
`office transmits the calling and called digits to digit
`receiver DR via conductors T1 in the normal manner.
`The TSPS rates the call and displays the charge and
`initial period information to an operator at a position
`such as position POS. A new network connection (not
`shown) is then established between conductors T1 and
`position POS by TSPS network NET. While the opera
`tor at position POS informs the calling party of the
`requisite coin deposit, outpulser OTP is controlled by
`the SPC to outpulse the digits in the called number via
`path P4 and conductors T2 to toll office TO. When the
`calling subscriber deposits coins at station CS, distinc
`
`BRIEF DESCRIPTION OF THE DRAWING
`The foregoing as well as other objects, features, and
`advantages of our invention will be more apparent from
`a description of the drawing, in which:
`FIG. 1 illustrates in block diagram form the manner in
`which a Special Service Announcement System
`50
`(SSAS), operable in accordance with the principles of
`our invention, is added to an existing Traffic Service
`Position System (TSPS);
`FIG. 2 illustrates in greater detail the interface be
`tween the stored program controller in TSPS and the
`microprocessing complex broadly shown as program
`mable controller PC in FIG. 1; FIGS. 3 and 4 illustrate
`the manner in which the circuitry in FIG. 2 is dupli
`cated to provide for more reliable operation;
`FIGS. 5 through 10, when combined, as shown in
`FIG. 1], illustrate in greater detail the unduplicated
`microprocessor system previously generalized in regard
`to FIG. 2;
`More specifically, FIG. 5 illustrates microprocessor
`MPO, and the manner in which it communicates with
`its peripheral devices;
`FIG. 6 illustrates memory ASTRO which stores bi
`nary announcement words and address generator AG
`
`60
`
`65
`
`

`

`5
`tive tones are generated thereat indicating the type of
`coin deposit, i.e., nickel, dime, quarter. While the cus
`tomer is depositing the coins, the toll of?ce TO estab
`lishes the call to the called station in the normal manner.
`When the called party answers and the operator has
`determined that the requisite amount has been depos
`ited, the call, under the control of the operator, is cut
`through by trunk TRKl directly from the local office
`L0 to the toll office TO.
`The TSPS system is also adapted to handle special
`service calls (such as person-to person, collect, credit
`card, charge-to-third number, and time and charges)
`originated from either coin stations such as CS or regu
`lar stations such as CSB. Generally, these calls are pro
`cessed by an operator at position POS, who requests
`information from the calling station and then utilizes the
`received information to request whether or not the
`called station or third party station accepts the call. For
`further details of how TSPS processes typical calls see
`page 2435 et seq. in the December 1970 Bell System
`Technical Journal.
`
`0
`
`5
`
`20
`
`35
`
`25
`
`4,054,756
`6
`from the SPC, programmable controller PC accesses
`the appropriate memory locations in announcement
`store ASTR and serially applies the digital binary bit
`information representing digitized speech retrieved
`from store ASTR to decoder DOG001 via lead AM001.
`This decoder converts the serial binary information into
`audible speech. An announcement requesting the appro
`priate deposit and initial time period (e.g., “Please de
`posit 60 cents for the ?rst 3 minutes") is applied to the
`calling subscriber via point X, hybrid HYZ, path API,
`hybrid HYl, leads C5001 path P2, conductors T1, and
`local of?ce L0 to station CS.
`Responsive to the received announcement, the calling
`subscriber begins to deposit coins in station CS. Station
`CS generates dual frequency, in-band tones for each
`coin deposited and indicates the amount of the depos
`ited coin by generating a sequence of one or more tone
`pulses; for example, a single dual-frequency pulse is
`generated for each nickel deposited, while two such
`pulses are generated for each dime deposited, and ?ve
`such pulses are generated for each quarter deposited.
`These tones are received over conductors Tl, network
`connection P2, leads C5001, hybrid l-IYl, and path AP2
`by coin tone detector TD001. This detector comprises
`means for detecting the joint presence of the two dis
`tinct frequencies and for counting the number of pulses
`thereby indicating the amount of each coin deposit in
`?ve-cent increments. Coin tone detector TD001 is peri
`odically scanned by programmable controller PC over
`lead CD001 to receive coin deposit detection informa
`tion therefrom. For each coin deposited, programmable
`controller PC updates its temporary memory for that
`detector and determines whether the requested deposit
`has been made and if not, waits for additional coins to be
`deposited. If the coins deposited are not sufficient, then
`the programmable controller PC accesses store ASTR
`and applies another announcement message or a prompt
`(e.g., "Please deposit 30 cents more”) to the calling
`subscriber via decoder DOG001.
`1.3 Special Service Announcement System
`As mentioned previously, the automated coin system
`in the above-mentioned Dudonis application has been
`modified to bene?cially automate the serving of special
`service calls in accordance with the principles of this
`invention. These special service calls include collect,
`person-to-person, charge-to-third number, credit card
`and time and chargesv In accordance with the principles
`of this invention, a generic approach suitable for com
`plete automation is utilized to service each of these call
`types.
`To place a special service call, a telephone subscriber
`dials 0 plus the called number (7 or 10 digits). These
`special service calls can be instituted from either coin
`stations such as, station CS in FIG. 1 or from regular
`stations such as, station CSB in FIG. 1. Local of?ce LO
`recognizes that the call requires special handling and
`then forwards the call to the TSPS in the usual manner.
`The called number as well as automatic number identi?
`cation ANI information identifying the calling station is
`received by digit receiver DR via path P1 from the T1
`leads in the usual manner. The TSPS upon detecting
`this 0+ call does not establish an operator connection
`and does not forward the call in the routine manner.
`Rather the SPC, as hereinafter explained more fully,
`commands programmable controller PC to provide
`either a tone or announcement requesting that the sub
`scriber identify the type of service desired. Only a tone
`
`1.2 Prior Art Automated Coin Subsystem
`This one illustrative embodiment of the invention is
`incorporated into a prior art Automated Coin Subsys
`tem (ACS) described in detail in the above~mentioned
`Dudonis application. More speci?cally, with regard to
`the structure generalized in FIG. 1, the Special Service
`Announcement System (SSAS) adds additional cir
`cuitry to the ACS in the above-mentioned Dudonis
`application. The added or modi?ed structure is shown
`in heavy underlining to point out how the automated
`coin subsystem was modi?ed to service special service
`calls in accordance with the principles of our invention.
`To elaborate, in regard to FIG 1, the added structure
`includes digit receiver DRR001 and encoder ECD001.
`Additionally, the program in the programmable con
`troller PC and the program in the SPC have been modi
`?ed, but the basic structural components thereof have
`not been altered. The information content stored in
`announcement store ASTR has been modi?ed. How
`ever, again the structure of the store itself has not been
`modified.
`The prior art ACS was operable to automatically
`perform all operator functions previously described in
`regard to coin paid station-to-station toll calls in TSPS.
`In ACS, announcements to the customers are provided
`by announcement circuits including decoder DOG001
`in announcement circuit ANMOOIB. Coin deposits are
`automatically detected by coin tone detectors suc