C-DOT 256P RAX SUBSCRIBER FEATURES

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1 C-DOT 256P RAX SUBSCRIBER FEATURES

2 System Practices Section No Draft 07, February 2001 C-DOT 256P RAX SUBSCRIBER FEATURES (Updated as per S/W Release 4-2-1) 2001, C-DOT Printed in India

3 C-DOT 256P RAX SUBSCRIBER FEATURES DRAFT 07 FEBRUARY 2001 MAGHA 2055 SERIES 200 : FEATURES CSP SECTION NO THIS C DOT SYSTEM PRACTICE REFERS TO THE C DOT 256 PORT RURAL AUTOMATIC EXCHANGE (ABBREVIATED AS C DOT 256P RAX IN THE REST OF THIS PUBLICATION). THE INFORMATION IN THIS SYSTEM PRACTICE IS FOR INFORMATION PURPOSES AND IS SUBJECT TO CHANGE WITHOUT NOTICE. A COMMENT FORM HAS BEEN INCLUDED AT THE END OF THIS PUBLICATION FOR READER'S COMMENTS. IF THE FORM HAS BEEN USED, COMMENTS MAY BE ADDRESSED TO THE DIRECTOR (SYSTEMS ), CENTRE FOR DEVELOPMENT OF TELEMATICS, 39, MAIN PUSA ROAD, NEW DELHI BY C DOT, NEW DELHI.

4 Table of Contents Notational Conventions...5 Chapter 1. Basic Services Subscriber Dialled Calls PBX Lines: Line Hunting...6 Chapter 2. Rapid Call Set Up Services Hot Line...7 Chapter 3. Call Restriction Services Out Going Call Restriction Summary of Outgoing Call Restriction...12 Chapter 4. Call Charge Facilities Charging Information Services Charge Debiting Services...13 Chapter 5. Information Services Level One Special Services...15 Chapter 6. Miscellaneous Services Malicious Call Service Trunk Offer Queue Service Calling Line Identity Presentation (CLIP)...17 Appendix - A Tones and Announcements Tones Announcements...18 H:\HOME\RAX\WORD\256RXSUF.DOC March 14, 2000

5 Notational Conventions BT - Busy Tone Conv - Conversation DT - Dial Tone Flash - Hook-switch flash (HSF), required for malicious call trace IND - Indicating positive acknowledgment (Note : This tone is same as call routing tone) KW - Key Word (4 digit secret authorisation code) Service Code - Service Enable code (valid values are 123 or 124) Choice Code - To select choice for outgoing call restrictions (valid values are 0, 1, 2, 3, 4) RBT - Ring Back Tone RH - Replace Handset LH - Lift Handset Note : To be able to use any feature, the subscriber must be registered with the exchange administration. SUBSCRIBER FEATURES 5

6 Chapter 1. Basic Services 1.1. SUBSCRIBER DIALLED CALLS Local, national and international calls can be dialled by the subscriber. Each subscriber's access level depends on the parameters programmed in the exchange database for his Directrory Number PBX LINES: LINE HUNTING This feature allows automatic selection of a free line from a group of lines serving a subscriber on reception of a call to that subscriber's general directory number. This facility is useful in enquiry services like the Railways, Airlines, etc. or where a group of lines is connected to PBX at the other end. Two types of hunting is possible i.e. fixed head hunt and progressive head hunt. In case of fixed head hunt, the call will be offered to pilot/principal directory number of the group. If the principal directory number is busy, the call will be offered to the next member of the hunt group. If the second member is also busy, the call will be offered to the next free available member of the group. For example, directory number 'P' is a principal directory no. of a group of fixed head hunt type. Directory nos. 'A', 'B', and 'C' are the other members of this particular hunt group. Then first call to 'P' will be offered to 'P'. The second call to 'P', if 'P' remains busy will be offered to 'A'. The next call to 'P', if 'P' and 'A' remain busy, will be offered to 'B' and so on. If 'P', 'A' and 'B' are busy, and when a call is made to 'P' and in the meantime 'A' becomes free, then call will be offered to 'A'. Hence, in case of fixed head hunt if principal directory no. is busy, then next call will be offered to next free member in the sequence. In case of progressive head hunting, if principal directory number is busy, then, further calls to principal directory number will be offered to one of the member line from the hunt group which has been idle for longer time. Take the above mentioned example with progressive head hunt type. 'P', 'A' and 'B' are busy, when a call is made to 'P'. If in the meantime 'A' became free, then the call will be offered to 'C' instead of 'A'. 6 C-DOT 256P RAX

7 Chapter 2. Rapid Call Set Up Services 2.1. HOT LINE Hot Line without Time-out This feature allows the subscriber to make calls to a fixed destination by just lifting his handset. The subscriber cannot dial any outgoing calls. Incoming calls to a subscriber having this feature, however, are not affected. The 'fixed destination' has to be pre-registered in the exchange. Feature Usage a. LH - RBT from distant end (if destination number is free) Hot Line with Time-out This feature allows a subscriber to make a call to a fixed destination by just lifting his handset and waiting for a short period of time. In case, the subscriber wants to make a call to a destination other than the fixed destination then the subscriber is expected to start dialling that subscriber directory number before the "time out". This is a useful facility, say, for communication between a factory and its registered offices or between two branches of an organisation etc. a. Feature Usage as Hotline LH - wait for a timeout (5 secs.) RBT from distant end (if free) b. Feature Usage to contact different number LH, dial desired directory no. (dial first digit within 5 secs of lifting handset) RBT from distant end. (if free) SUBSCRIBER FEATURES 7

8 Chapter 3. Call Restriction Services 3.1. OUT GOING CALL RESTRICTION Administration Controlled Restrictions This feature allows the Telecom Administration to prevent all or certain type of outgoing calls from the telephone of a subscriber. A useful facility for a subscriber, if he wants to ensure prevention of misuse of his lines. Various levels of restriction are available barring of all calls, calls to Regional STD level, STD level and ISD level, special service level, etc. Under special service level, a subscribers can have access to all codes or only to the emergency routes. These options can be chosen through admin commands. Any subscribers having access to local calls can dial '000' to make a collect call. Access levels are delinked from each other - for example a subscriber may have access to local and ISD calls, but he may be barred from STD calls. Access from CCB subscribers to Group Dialling routes can be controlled by the system. This can be done by enabling/disabling calls from CCB subscribers on each group dialling route. The default database will have CCB subscribers' calls disabled on all routes Subscriber Controlled Restrictions This feature allows the subscriber to activate (and later deactivate) prevention of all or certain outgoing calls from his telephone line by following certain control procedures. This facility is completely automatic and requires the subscriber to dial a 'Service Code' and 'Key Word' (4 digits) followed by 'Choice Code'. 'Key Word' is a secret code which the subscriber has to feed himself first time by following certain control procedure. 'Key Word' can also be changed by the subscriber and is kept secret by the system. 'Service Code' is basically a three digit number, (123 or 124 as the case may be). 'Choice Code' is a single digit number (0 to 6) and is used to allow/bar particular service as explained below. When this facility is invoked from the system for a particular subscriber, the subscriber has only local call facility. The 8 C-DOT 256P RAX

9 Call Restriction Services subscriber is required to set the password and then allow STD, ISD or other levels for usage. a. How to register 'Key Word' first time: LH - DT - Service Code - Key Word - Key Word-IND Service code for invoking this feature is '123' Example : If subscriber chooses its Key Word as '1991' (say) LH - DT IND b. How to change 'Key Word' This facility will be used to change 'Key Word' by subscriber himself. Activation LH - DT - Service Code - Key Word - New Key Word - IND Example : Let us say subscriber want to change his 'Key Word' from '1991' to '1856' LH - DT IND Service code is '123' for facility. New keyword will become '1856'. c. How to bar a subscriber line from originating STD/ISD calls : This facility is useful if subscriber wants to bar STD/ISD calls from his telephone and wants to allow local and other calls. Activation LH - DT - Service Code - Key Word - Choice Code - IND Service Code is '124' and choice code is '1' for this facility. Example : LH - DT IND d. How to bar subscriber line from Trunk booking (all special services except emergency route) and originating STD/ ISD calls : If subscriber wants to make only local calls and wants to bar STD/ISD/Trunk booking. SUBSCRIBER FEATURES 9

10 Chapter 3 Activation LH - DT - Service Code - Keyword - Choice Code - IND Service code is '124' and choice code is '2' for this facility. Example : LH - DT IND Note: Emergency numbers will be allowed. e. How to bar subscriber line from originating ISD calls only : If subscriber wants to allow Local/STD/Trunk booking but bar ISD calls Activation LH - DT - Service Code - Key Word - Choice Code - IND Example : Service code is '124' and choice code is '3' for this facility. LH - DT IND f. How to bar all types of calls except emergency calls. To make available emercncy call only. LH DT Service Code Keyword Choice Code IND Service code is '124' and choice code is '4' for this facility Example : LH DT IND g. How to bar STD and ISD calls To make available RSTD/Local/ Emergency/Special Services calls. Activation LH DT service Code Keyword Choice Code IND Service code is '124' and choice code is '5' for this facility. Example : LH DT IND 10 C-DOT 256P RAX

11 Call Restriction Services h. How to bar local and Special Services calls. To make available STD/ISD/RSTD/Emergency calls. Activation LH DT Service Code Keyword Choice code IND Service code is '124' and Choice Code is '6' for this facility Example : LH DT IND i. How to allow all types of calls : (Deactivating any of the above barring). Note : To make available Local/Trunk booking/std/isd calls Activation LH - DT - Service Code - Key Word - Choice Code - IND Service code is '124' and choice code is '0' for this facility. Example : LH - DT IND Subscriber should not forget his 'Keyword'. Dialling wrong 'Keyword' will not result in invokation of desired facility. In case subscriber forgets his secret 'Keyword', he has to contact concerned exchange administration for reinitialisation of his code. SUBSCRIBER FEATURES 11

12 Chapter 3 j. Matrix for Choice Code and Corresponding facility available. Facility Available Choice Code STD ISD RSD LOCAL Emergency Services Special Services Indicates that this Facility is available SUMMARY OF OUTGOING CALL RESTRICTION S.No. Service Description Service Code Choice Code 1. Registering 'Key Word' first time Changing 'Key Word' Barring a line from RSTD/STD/ISD calls Barring a line from trunk booking /RSTD/STD/ISD calls (except Emergency Calls) Barring a line from ISD calls only Allowing all types of calls (Local, STD, ISD, Trunk, RSTD, Emergency) Barring all types of calls (except Emergency calls) Barring a line for STD/ISD calls. i.e. allowing Regional STD calls Barring line for Local & Special Services C-DOT 256P RAX

13 Chapter 4. Call Charge Facilities 4.1. CHARGING INFORMATION SERVICES Subscriber's Home Meter This feature allows the subscriber to have a meter installed at his premises showing the total call units. The facility is useful to the subscribers who want to get an idea as to how many calls have been made so far. This meter operates on 16 KHz pulses Detailed Call Charge Recording/Storage/Printout This feature allows the subscriber to get a printed record of all calls (or only long distance calls) made from his line indicating the day and date, the called number, duration and charge of calls Subscriber Meter Threshold This feature will set the upper limit on the metering for a subscriber. If the meter exceeds the threshold limit defined, then the subscriber will not get the dial tone. Exchange operator can control the line usage this facility based on the payment status CHARGE DEBITING SERVICES Coin Box Lines The system has a suitable interface and other provisions so that a special telephone set for which outgoing calls are permitted only after insertion of adequate coin(s) on answer by the wanted party; while, incoming calls are allowed without payment. Outgoing calls to certain emergency services may be permitted without payment. For CCB lines, three different types of chargings are possible. They are a) Unit Fee : In this mode the CCB line will be charged only one unitirrespective of duration of the calls SUBSCRIBER FEATURES 13

14 Chapter 4 b) Disconnect : In this mode the call will get disconnected once the duration for one unit has expired. (Case of Intra RAX calls which are not unit fee calls c) Continue : Same as above except that the call will not be disconnected. It will be treated as ordinary subscriber line. In this case the CCB subscriber will be charged at rate programmed (for that call) at the exchange STD Coin Box Lines/STD PCO The system has a suitable interface and other provisions so-that a special telephone set which can charge subscriber periodically (for STD / ISD calls) on receiving 16 KHz pulses from the exchange Non-Metered Lines This feature allows installation of certain telephone lines, calls to which are not metered. This feature is useful in certain emergency services like fire, ambulance, etc. for public utility. 14 C-DOT 256P RAX

15 Chapter 5. Information Services 5.1. LEVEL ONE SPECIAL SERVICES The exchange caters to various requirements of the "level one" services like Trunk Booking, Directory Enquiry etc. Exchange also permits defining certain 'Level 1' services as Emergency numbers like : Police, Ambulance, Fire etc. A subscriber having access to 'special serviceemergency only' can dial only these numbers on special service level. SUBSCRIBER FEATURES 15

16 Chapter 6. Miscellaneous Services 6.1. MALICIOUS CALL SERVICE At the discretion of the Administration, assistance is given to ascertain the origin of malicious, nuisance or obscene calls. Whenever the called subscriber is registered in malicious call trace category, the exchange stores the identity of calling subscriber (in case of intra exchange calls or calls from exchange having the identification capability) or the identity of the incoming junctor (if the distant exchange does not have facility to identify the calling subscriber). Feature Usage Activation Conv - Flash HSF during conversation, if malicious call service is allowed on particular subscriber, is indication to exchange that called subscriber needs this call to be traced TRUNK OFFER This facility allows the network operator to interrupt and speak to a subscriber already busy in a conversation. A useful facility for the Administration and subscribers, as, it allows the operator to announce an important call. For example, a trunk call is to be offered to a subscriber already busy in a conversation. The option to accept the call from the operator lies with the subscriber QUEUE SERVICE This feature allows the subscriber to have fresh callers placed in a Queue when his line is busy. The service is of particular value to subscribers who have a single number and who do not want to lose call when the line is busy. For example a directory no. 'A' having call queue facility is busy in conversation with other subscriber say 'B'. Now if another subscriber 'C' dials 'A', then 'C' will be placed in Queue. 'A' will get an indication tone of small duration periodically which indicates that a call is placed in queue. 'C' will get either RBT or an announcement indicating that he has been placed in queue. 'A', if desires, can discontinue the call with 'B' and attend to the call originated by 'C'. 16 C-DOT 256P RAX

17 Miscellaneous Services 6.4. CALLING LINE IDENTITY PRESENTATION (CLIP) This feature allows the subscriber to view the calling subscriber number before actually answering the call. This feature is mot useful to these subscribers who receive malitions calls. An additional CLIP display unit or a telephone instrument with CLIP display in which subscriber can view the calling line identity is needed for this feature, along with hardware changes on the corresponding line card. This facility can be enabled/disabled for a subscriber through exchange administration. SUBSCRIBER FEATURES 17

18 Appendix - A Tones and Announcements 1.0 TONES The following tones are provided in C-DOT 256 RAX: Sl.No. Name of the Tone Freq. (Hz) Cadence 1. Dial Tone 400 ± 25 Continuous 2. Busy Tone secs on 0.75 secs off 3. NU Tone secs on 0.2 secs off 4. RB Tone 400 ± secs on 0.2 secs off 0.4 secs on 2.0 secs off 5. Congestion Tone secs on 0.25 secs off 6. Answering Circuit Tone 800 Continuous 7. Call Routing Tone (Pip-pip Tone) (Indication Tone) sec off 0.9 sec on 2.0 ANNOUNCEMENTS Either English only or English and Regional announcement are possible in RAX which can be selected through MMI. The English announcements available are given below alongwith mapped tones for each, (in case announcements are not enabled or one announcement card is absent/faulty the corresponding tones will get extended. 18 C-DOT 256P RAX

19 Tones and Announcements S.No. Context Announcement Mapped Tone 1. Route Out of Order The lines to the route dialled by you are out of order. Kindly try after some time. 2. Number Non Existent The number you have dialled does not exist. Kindly confirm the number from directory or consult enquiry operator. 3. Route Congestion All lines to the route dialled by you are busy. Kindly try after some time. Congestion Tone NU Tone Congestion Tone 4. Call Queue Kindly wait. You are in a queue. Ring Back 5. Bill Not Paid Kindly check if you have paid your telephone bill. 6. Facility Not Available This facility is not available on your telephone. 7. Number Out of Order The line to which you have dialled is presently out of order. Kindly dial after some time. 8. Route Non Existent There is no route corresponding to the digits dialled by you. Kindly confirm the number from directory or consult Enquiry Operator. NU Tone NU Tone NU Tone NU Tone SUBSCRIBER FEATURES 19

20 System Practices COMMENTS The following comments pertain to: Document Name CSP Section - - Issue/Draft, - No. (Month) (Year) COMMENTS : (Use a separate sheet if required) Please mail your comments to: Centre for Development of Telematics Attn: Mr. Y.K. Pandey Director, Systems 39, Main Pusa Road New Delhi Tel.: Fax: Your Reference: Name : Designation : Company : Address : Tel. : Fax :

C-DOT 256P RAX FEATURE DESCRIPTION

C-DOT 256P RAX FEATURE DESCRIPTION System Practices Section No. 355-202-0353 Draft 06, February 2001 C-DOT 256P RAX FEATURE DESCRIPTION (Updated as per Software Release 4-2-1) 2001, C-DOT Printed in India