1、CEPT T/CS*28-02*E m 232b414 0004bb2 T m O I. *-O2 Page E 1 Recommendation T/CS 28-02 (Brussels 1980, revised in Innsbruck 1981) NAMES AND MEANINGS OF TONES AND GENERAL, DESIGNATION FOR VERBAL ANNOUNCEMENTS Recommendation proposed by Working Group T/WG 1 I “Switching and Signalling” (CS) Revised text
2、 revised of the Recommendation adopted by the “Telecommunications” Commission: “The European Conference of Postal and Telecommunications Administrations, considering - that Recommendation Groups T/CS i, T/CS 2 and T/CS 3 contain signalling systems specifications which refer to sending tones and reco
3、rded announcements to the subscriber in certain phases of the call Set-up; - that in relation to the development of digital systems and new services, more specifications requiring sending tones and recorded announcements to the subscriber will be recommended and that Recommendation T/SF 14 4 propose
4、s extensive use of tones and announcements, recommends to the members of the CEPT, the use of the following names and meanings of tones and general designations of announcements.” 1. INTRODUCTION Tones with specific meanings and recorded verbal announcements are employed to give information to the u
5、ser of the network. When a user is carrying out a control operation, he should have adequate written instructions to help him to recognise tones. Due to the difficulties the user has in distinguishing a great variety of tones, only a limited number of tones can be used. In contrast, no such limitati
6、on need apply to the range of verbal information sent to the user in the form of announcements. Conversely, announce- ments may cause language problems, but tones will not do so. Each tone and recorded announcement transmitted from the network to the user is called, in a general sense, an audible in
7、dication. Silence is understood as the absence of an audible indication. Silence will be interpreted by the user: - as normal if he knows that he is to progress with dialling; - as abnormal or failure if, having completed dialling, the silence persists for a longer period than he Reference to the in
8、terpretation of silence is made in the specifications of the user/network control protocols concerned. accepts as normal before receiving some audible indication. 2. TONES The use of tones is attractive due to their low cost, the simplicity of the technical solution, and the avoidance of language pr
9、oblems. The characteristics of tones are defined by cadence, frequency and volume. Technical requirements relating to these characteristics and the generation of tones are specified in Recommendation Note: Audible characteristics of the tones are studied by Working Group SF. T/CS 20-15 SI. 3. NAMES
10、AND MEANINGS OF TONES The definitions below apply. They refer to tones used in the European network. 3.1. Dial tone An audible indication that the exchange is ready to receive call information and inviting the user to start sending call information. Private automatic branch exchange internal dial to
11、ne An audible indication that the private automatic branch exchange is ready to receive call information and inviting the user to start sending call information. 3.2. 3.3. Special dial tone An audible indication that the exchange is ready to receive call information and inviting the user to start se
12、nding call information; at the same time, reminding the user that special conditions apply to the termination from which the call is being made. CEPT T/CS*28-02*E 232b414 0004663 L T/CS 28-02 E Page 2 3.4. 3.5. 3.6. 3.7. 3.8. 3.9. 3.10. 3.11. 3.12. 3.13. 3.14. 4. Ringing tone An audible indication t
13、o the caller advising that a connection has been made and that a calling condition is being applied to the distant telephone number or service point. Busy tone An audible indication to the caller advising that the distant telephone number is busy. Congestion tone An audible indication to the caller
14、advising that the lines or switching equipment necessary for setting up a required call or for the use of a specific service are temporarily engaged. Special information tone An audible indication to the caller advising that the called number cannot be reached for reasons other than subscriber busy
15、or congestion and inviting the caller to seek the assistance of an operator as necessary. The tone may also be used in conjunction with a recorded announcement to signify that what the caller is about to hear is a recording and inviting the caller to seek the assistance of an operator if he cannot u
16、nderstand the announcement. Warning tone An audible indication to a caller to warn that privacy of a conversation cannot be ensured, e.g. where a recording machine is being used, or to both parties, during a call, to warn that the privacy of the conversation has been interrupted. Call waiting tone A
17、n audible indication to the call waiting supplementary service user who is engaged on a call, that someone is attempting to call that termination. Paytone An audible indication to users of a payphone to advise that a payment is required. Payphone recognition tone An audible indication to a public ex
18、change operator that the termination to or from which connection is sought is identified as a payphone. Queue tone An audible indication to a caller that the call has been placed in a queue and is awaiting an answer. Comfort tone An audible indication that the call is being processed and that the ca
19、ller should wait. Intrusion tone An audible indication to persons on a telephone call that some third person, e.g. an operator or a user of PABX executive intrusion service, is intruding or has intruded on the conversation. VERBAL ANNOUNCEMENTS The use of verbal announcements is attractive for the v
20、ariety and detail of the information that can be supplied. Technical characteristics and requirements regarding the generation of verbal announcements are specified in Recommendation T/CS 20-15 5. Note: General rules for the composition of announcements are studied by Working Group SF. Edition of Ma
21、y 15, 1986 CEPT T/CS*Z-OZ*E 2326414 0004664 3 5. O 5.1. 5.1.1. 5.1.2. 5.2. 5.2.1. 5.2.2. 5.2.3. 5.2.4. TICS 28-02 E Page 3 GENERAL DESIGNATIONS FOR RECORDED ANNOUNCEMENTS General verbal announcement (a) Definition (b) Example General positive verbal announcement (a) Definition A verbal announcement
22、giving general information about a call attempt or control order. (Under study.) A verbal announcement given to the user of a supplementary service to advise that the request has been accepted. (b) Example “Your order has been executed.” General negative verbal announcement (a) Definition A verbal a
23、nnouncement given to the user of a supplementary service to advise that the request cannot be executed. “Your order cannot be executed.” (b) Example Specific verbal announcement (a) Definition (b) Example A verbal announcement giving specific information about a call attempt or control order. (Under
24、 study.) SpeciJic positive verbal announcement without supplementary information (a) Definition A verbal announcement indicating to the user that the request for a particular supplementary service has been accepted. “The call barring service is now in operation.” (b) Example Spec negative verbal ann
25、ouncement without supplementary information (a) Definition A verbal announcement indicating to the user that the request for a particular supplementary service cannot be executed or that the call cannot be completed. “Your order for call transfer cannot be executed.”; “The called number is not obtai
26、nable because of a network fault.” (b) Examples SpeciJic positive verbal announcement with supplementary information (a) Definition A verbal announcement completed with the supplementary information received, indicating to the user that a certain condition is being established. “An alarm call is boo
27、ked for 06.30.” (b) Example Specijc negative verbal announcement with supplementary information (a) Definition A verbal announcement indicating to the user that the request for a particular supplementary service cannot be executed or that the call cannot be completed, thereby including specific advi
28、ce. “The called number has been changed, please call number .” (followed by, e.g. the new number). (b) Example Edition of May 15, 1986 CEPT T/CS*ZB-OZ*E 232b414 0004665 5 = TICS 28-02 E Page 4 References Recommendation Group T/CS. Use of switching and signalling systems in the network. Recommendation Group T/CS. Inter-exchange signalling. Recommendation Group T/CS. Leased line signalling. Recommandation T/SF 14. Application of tones and recorded announcements in telephone services. Recommendation T/CS 20-1 5. Tones and announcements. i 2 3 4 5 Edition of May 15, 1986
