ATIS 1000109-2014 Exchange-Interexchange Carrier Interfaces C 950+XXXX EC-to-IC Access Signaling Protocols.pdf

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1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-1000109.2014 Exchange- Interexchange Carrier Interfaces 950+XXXX EC-to-IC Access Signaling Protocols As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the industrys most

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5、 For more information, visit. AMERICAN NATIONAL STANDARD Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the

6、 ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted eff

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8、orming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in th

9、e name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the Am

10、erican National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Notice of Disclaim

11、er however, no attempt has been made to include exhaustive lists. 2 Related Standards however, it may be another switching entity such as an office performing centralized automatic message accounting (CAN1A) or an operator services system. 1This document is available from the Alliance for Telecommun

12、ications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Washington, DC 20005 2This document is available from the International Telecommunications Union. 3This document is available from Telcordia, at. ATIS-1000109.2014 4 Disconnect signal. An on-hook signal indicating the connection is b

13、eing cleared. It is initiated by the disconnect-control office (except under maintenance conditions) and is repeated through the trunks composing an established connection. The signal responding to a disconnect signal, but applied in the direction opposite to the direction of propagation of the disc

14、onnect signal, may also be considered a disconnect signal. Disconnect timing: The timing of the period during which a hang-up signal is being received from the called end office and an off-hook signal is being received from the calling end office. Dual Tone Multifrequency (DTMF) signaling: A set of

15、sixteen signals consisting of tone bursts of two out of eight voice-band frequencies that transmit ten numeric and six control signals. End Office (EO): An EO switching system that terminates station loops and connects the loops to each other and to trunks. Exchange Carrier (EO): A carrier authorize

16、d to provide telecommunication services within one or more access service areas. Glare: The simultaneous, or near- simultaneous, seizure of a two-way trunk at both ends. The unguarded interval between the seizure of the trunk at one end and the subsequent making busy of the trunk at the other end al

17、lows glare to occur. Hang-up: End user placement of a telephone handset or other unit of telecommunications equipment in the quiescent state. Hang-up signal: An on-hook signal sent from an end office toward the disconnect-control office indicating end user hang-up and requesting that the connection

18、be disconnected. The interface remains dedicated to the call until the disconnect-control office responds to the hang-up signal. Interexchange Carrier (IC): A carrier authorized to provide interexchange telecommunication services within World Zone 1 using the North American Numbering Plan (Bellcore

19、TR-NPL-000275). International Carrier (INC): A carrier authorized to provide telecommunications ser- vices outside World Zone 1 using the international dialing plan (OOITT Recommendations E.163 and E.164); such a carrier also has the option of providing service to World Zone 1 points outside the con

20、tiguous forty-eight United States. Maintenance timing: The timing of the period during which a hang-up signal is being sent by a switching entity to the disconnect-control office before receiving a disconnect signal from the disconnect-control office. Multifrequency (MF) pulsing: Tone bursts of two

21、out of six voice-band frequencies that transmit ten numeric and five control signals. Point of termination (POT): The point of demarcation between carriers that establishes the technical interface, test points, and division of operational responsibility. 4 E-I Interface 4.1 Description 4.1.1 Locatio

22、n The interface is located in a trunk between an EO switching system and an IC switching system; hence, an E-I Interface provides IC access on a trunk-signaling basis to the EO switching system. 4.1.2 Characteristics The interface has the following characteristics: (1) The carrier access code is 950

23、+XXXX, where X = 0 to 9. ATIS-1000109.2014 5 (2) Individual-channel signaling is employed across the interface. (3) On EO-to-IC calls, an off-hook signal that is independent of called user answer is provided by the IC. 4.2 Interface Protocol 4.2.1 General 4.2.1.1 Signals The following signals establ

24、ish, maintain, and disconnect a connection through the interface: 1. Seizure 2. Winks 3. MF pulses 4. DTMF pulses 5. Dial pulses 6. Off-hook 7. Call progress information 8. Disconnect 4.2.1.2 Protocols The set of rules that govern the sequence and separation in time of the signals is the signaling p

25、rotocol. Since different protocols are needed to establish different types of connections, there are several signaling protocols. This standard specifies the following protocols: I. 950+XXXX Access Signaling With ANI.4The following are the prominent characteristics of the protocol: a) Carrier access

26、 code is 950+XXXX. b) EC forwards an access code field rather than an address field. c) EC forwards an identification field. d) Any required calling user-to-IC signaling is accomplished through the calling user-to-IC voiceband channel established by the EC.5II. 950+XXXX Access Signaling Without ANI.

27、 The following are the prominent characteristics of the protocol: a) Carrier access code is 950+XXXX. b) EC forwards an access code field rather than an address field. c) EC does not forward an identification field. d) Any required calling user-to-IC signaling is accomplished through the calling use

28、r-to-IC voiceband channel established by the EC.4III. 950+XXXX Access Seizure-Only Signaling. The following are the prominent characteristics of the protocol: 4See Appendix A. 5Dial pulse signaling might also be used for this purpose; see Appendix B. ATIS-1000109.2014 6 a) Carrier access code is 950

29、+XXXX. b) EC does not forward an access code field. c) EC does not forward an identification field. d) Any required calling user-to-IC signaling is accomplished through the calling user-to-IC voiceband channel established by the EC.44.3 Protocol Combinations No provision is included in the 950+XXXX

30、Access protocols to distinguish one from another at the interface. 4.4 Conventions 4.4.1 Trunk Directionality Trunk directionality refers to the way a trunk may be used in establishing a connection. A one-way trunk from A to B can only be used to extend a connection in the A-to-B direction. A two-wa

31、y trunk between A and B can be used for A-to-B and B-to-A connections. 4.4.2 Notations Within Protocol Specifications Table 1 gives the notation conventions used in this standard. 5 Protocols 5.1 950+XXXX Access Signaling With ANI 5.1.1 Basic Protocol 5.1.1.1 Description This protocol uses a pulsing

32、 stream, generated by EC switching equipment, that consists of two fields of MF pulses. The first field contains all or a subset of the carrier access code (950+XXXX); this field is called the access code field. The second field contains an information digit and the calling users ANI; this field is

33、called the identification field. After these fields have been sent, the EC equipment provides a voiceband path between the calling user and the IC. Any additional information (e.g., the called number) needed by the IC to provide a service may be transmitted via this path (e.g., with DTJ1F signaling)

34、. 5.1.1.2 Nominal Signaling Sequence The nominal EC-to-IC signaling sequence shall be as follows: (1) After receiving the carrier access code from the calling user, the EC shall initiate actions to seize a trunk to the IC. (2) The IC shall respond to the seizure with a wink-start signal when it is r

35、eady to receive pulsing. (3) Upon receipt of the wink-start signal from the IC, the EC shall outpulse the access code field using MF pulsing. (4) When the IC has received the access code field, it shall respond with an off-hook signal. (5) The EC shall respond to this off-hook signal by outpulsing t

36、he identification field to the IC. After outpulsing the identification field, the EC shall cut through the voiceband channel from the calling ATIS-1000109.2014 7 user to the IC. The IC should not attempt to use the connection to transmit a dial tone or other voiceband communication to the calling us

37、er until after receiving the identification field.6(6) Call progress tones, if required, shall be provided by the IC. Called user answer shall not generate any supervisory signaling from the IC to the originating EC. (7) Depending on whether the EC or the IC initiates call clearing, one of the follo

38、wing two sequences shall occur: a) If the EC is the first to be finished with the call (e.g., because of calling user hang-up), the following shall occur: i. The EC shall terminate use of the talking path through the interface, should clear the EC connection, and shall send an EC disconnect signal (

39、on-hook) to the IC. ii. When the IC detects the EC disconnect signal, the IC shall send the IC disconnect signal (on-hook) to the EC and should clear the IC connection. b) If the IC is the first to be finished with the call (e.g., because of called user hang-up), the following shall occur: i. The IC

40、 shall send a hang-up signal (on-hook) to the EC. The interface shall remain dedicated to the call, but the IC may interrupt the talking path through the interface to the EC. ii. When the EC receives the IC hang-up signal and determines that disconnect should occur (e.g., when the disconnect-control

41、 office either receives the calling user hang-up signal or the EC disconnect timing interval expires), the EC (a) shall send the EC disconnect signal (on-hook) to the IC; (b) shall terminate use of the interface for the call; and (c) should clear the EC connection. 5.1.2 Distinguishing Characteristi

42、cs The following are the distinguishing characteristics of the 950+:X:X:XX Access Signaling With ANI protocol determined from comparing the signaling protocols in Section 5 of this standard: (1) The call seizure signal is sent from the EC to the IC. (2) An identification field is always sent by the

43、EC to the IC. 5.1.3 Specific Example A specific example of a call using this protocol is shown in Figure 1. 5.1.4 Variations The variations discussed below are illustrated in Table 2. 5.1.4.1 Access Code Field The 0-7D in the access code field shall be the carrier access code (950+:X:X:XX) or a subs

44、et thereof. When fewer than seven digits are transmitted, digits shall be deleted from left to right. 6The IC, using the voiceband communication path through the EC network to the calling user, can then prompt the calling user (e.g., via a second dial tone) for information (e.g., the called number)

45、needed to provide service. The calling user likewise can use voiceband communications (e.g., DTMF signaling) to respond to these prompts. ATIS-1000109.2014 8 5.1.4.2 Identification Field The identification field shall be KP+I+0/7D+ST, where I is the ANI information digit. Example assignments of code

46、s for the information digit are given in Table 3. Whether 0 or 7 digits are sent depends on whether ANI information is available, and is indicated by the I digit. 5.1.5 Time Limits 5.1.5.1 Wink-Start Signal The IC shall return the wink-start signal within 3.5 seconds of the trunk seizure. 5.1.5.2 Wi

47、nk-Start Guard The end of the wink-start signal shall not occur before 210 milliseconds after receipt of the incoming seizure signal. The IC shall be prepared to receive MF pulses 35 milliseconds after the end of the wink- start signal. The EC shall begin MF pulsing no sooner than 50 milliseconds af

48、ter the end of the wink-start signal. 5.1.5.3 Off-Hook Signal The IC shall send the off-hook signal no sooner than 100 milliseconds and no later than 3.5 seconds after the IC has received the access code field. 5.1.5.4 Disconnect Timing Interval After receiving the IC hang-up signal, the EC disconne

49、ct-control office shall initiate a disconnect timing interval that shall be between 10 and 12 seconds in length. 5.1.5.5 Maintenance Timing Interval After sending the IC hang-up signal in an IC- initiated call-clearing sequence, the IC may initiate a maintenance timing interval that shall be a minimum of 30 seconds. 5.1.5.6 Trunk Guard Interval On IC-initiated call-clearing sequences, the EC shall not send a new interface seizure signal for a minimum of 750 milliseconds after the EC sends the EC disconnect signal (on-hook). On EO-initiated call-clearing sequences, the EC shall not se