TIA-689-A-2003 Telecommunications Multiline Terminal Systems PBX and KTS Support of Enhanced 9-1-1 Emergency Calling Service (ANSI Withdrawn 07 24 2015)《加强的9-1-1急救服务呼叫的1PBX和KTS支持》.pdf

1、 ANSI/TIA-689-A-2003 APPROVED: MARCH 28, 2003 REAFFIRMED: AUGUST 26, 2009 WITHDRAWN: JULY 24, 2015 TIA-689-A (Revision of TIA-689) March 2003Telecommunications Multiline Terminal Systems PBX and KTS Support of Enhanced 9-1-1 Emergency Calling Service NOTICE TIA Engineering Standards and Publications

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20、BLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-689-A 1TABLE OF CONTENTS 1 INTRODUCTION5 1.1 Enhanced 911 Emergency Calling Service 5 2 SCOPE.9 3 REFERENCES.10 3.1 Normative References10 3.2 Mandatory and Advisory Requirements . 11 4 DEFINITIONS, ABBREVIATIONS AND ACRONYMS 11 4.1 Definitions 11 4.2 Abb

21、reviations and Acronyms13 5 TECHNICAL REQUIREMENTS 14 5.1 General 14 5.1.1 Dialing 14 5.1.1.1 Three Digit 911 Dialing .14 5.1.1.2 Dial 9 Blocking14 5.1.2 Call Routing 14 5.1.2.1 Automatic Route Selection .14 5.1.2.2 Recognition of Made-Busy Conditions .14 5.1.2.3 Alternate Routing for Out-of-Service

22、 Conditions 15 5.1.2.4 Alternate Routing for Trunk Made-Busy Conditions .15 5.1.2.5 Alternate Routing for Busy, Made-Busy resistors R2 + RL having a value between 400 and 4200 ohms; voltages between 35 and 80 volts; and the polarity switch in either position. 5.2.3.11.6 Signal Levels The analog 911

23、CAMA trunk shall comply with all of the applicable FCC Rules and Regulations in 47 CFR Part 68 Normative Reference 5, section 68.308. In addition, when the analog 911 CAMA trunk is transmitting a MF signal, the maximum MF signal power delivered to a 600-ohm termination shall not exceed -6 dBm. When

24、the analog 911 CAMA trunk is not transmitting a MF signal, the maximum power at any MF frequency, delivered to a 600-ohm termination, shall not exceed -58 dBm. 5.2.3.12 Recognition of Made-Busy Conditions When in the idle condition, the MLTS shall recognize a trunk made-busy signal consisting of rev

25、erse battery polarity between the tip and ring (ring more positive than tip). The MLTS shall not attempt to complete a call over a 911 CAMA trunk when the network signals a made-busy condition. 5.2.3.13 ELIN Failure The KP+2+ST ELIN failure sequence shall be transmitted only when permitted by the En

26、hanced 911 system provider and only when MLTS equipment failure prevents the determination of outpulsing of the ELIN. The Enhanced 911-system provider may require a default ELIN to be used instead of the KP+2+ST failure sequence. 5.2.4 Digital 911 CAMA Trunk A single DS0 of a channelized DS1 service

27、 may be used to provide a digital 911 CAMA trunk described in this standard. Per-channel robbed-bit signaling shall be employed. 5.2.4.1 Call States and Processes When a digital 911 CAMA trunk is used, the call state and disconnect sequence requirements in subsections of 5.2.3 shall be applicable. 5

28、.2.4.2 Supervisory Signaling The on-hook and off-hook supervisory signals that are used to control call states and processes shall conform to the signaling requirements in ANSI TIA-464-C-2002 Normative Reference 3, section 7.2. 5.2.4.3 Digital Encoding/Decoding In order to provide compatibility with

29、 existing networks in North America, -law encoding/decoding as specified in Normative Reference 6 for voiceband encoding and decoding shall be used for digital 911 CAMA trunks. TIA-689-A 225.2.4.4 MF Signaling The MF signaling used with a digital 911 CAMA trunk shall meet the requirements in section

30、 5.2.3 when encoded/decoded using -law. 5.2.4.5 Loss Plan Nominal values for interface-to interface connections involving ISPBX lines and trunks are given in Table 12 of ANSI TIA-464-C-2002 Normative Reference 3. The digital 911 CAMA trunk should receive the AAL(D) loss treatment. 5.2.4.6 Noise and

31、Distortion Impairments The digital 911 CAMA trunk port shall meet the MLTS idle channel noise, crosstalk coupling loss, quantization distortion, and single frequency distortion requirements of ANSI TIA-464-C-2002 Normative Reference 3. 5.2.4.7 Signal Levels Digital 911 CAMA trunks shall comply with

32、all of the applicable FCC Rules and Regulations in 47 CFR Part 68 Normative Reference 5, section 68.308. In addition, when the digital 911 CAMA trunk is transmitting an MF signal, the maximum equivalent power of the encoded MF signals as derived by a test configuration with a -law PCM decoder as spe

33、cified in Normative Reference 6 and delivered to a 600-ohm termination shall not exceed -6 dBm. When the digital 911 CAMA trunk is not transmitting an MF signal, the maximum power delivered to a 600-ohm termination at any MF frequency shall not exceed -58 dBm. 5.2.4.8 Recognition of Made-Busy Condit

34、ions The made-busy process for digital 911 CAMA trunks shall conform to the specifications in section 7.2.2.6 of ANSI TIA-464-C-2002 Normative Reference 3. The MLTS shall not attempt to complete a call over a 911 CAMA trunk when the network signals a made-busy condition. 5.2.4.9 ELIN Failure The KP+

35、2+ST ELIN failure sequence shall be transmitted only when permitted by the Enhanced 911 system provider and only when MLTS equipment failure prevents the determination of outpulsing of the ELIN. The Enhanced 911-system provider may require a default ELIN to be used instead of the KP+2+ST failure seq

36、uence. 5.2.5 ISDN Trunk Interface 5.2.5.1 General ANSI T1.607-2000, DSS1 Layer 3 Signaling Specification Normative Reference 12 and ANSI T1.628-2000, Emergency Calling Service (ECS) Normative Reference 8 contain ISDN signaling requirements for an Enhanced 911 call at the originating user-to-network

37、interface (e.g., MLTS-to-network). 5.2.5.2 Conformance with Other Industry Practices and Standards Some Service Providers may offer Enhanced 911 Calling Services using an ISDN Trunk Interface and operating standards other than as set forth in Section 5.2.5. The methods and technical requirements use

38、d by these Service Providers are out of the scope of this Standard. TIA-689-A 23The ISDN signaling requirements in this section are in conformance with standards set forth in ANSI TIA-464-C-2002 Normative Reference 3. In addition, the ISDN signaling requirements set forth in ANSI T1.628-2000 Normati

39、ve Reference 8 and ANSI T1.628a-2001 Normative Reference 9 are consistent with the NENA Enhanced 911 Multi-line System Model Legislation Informative Reference 3. 5.2.5.3 Signaling Requirements Section 6.1.3.1 and 6.2.4.1 of ANSI T1.628-2000 Normative Reference 8 specifies that a Codeset 5 IE, “Gener

40、ic information (GI)” containing a Location Identification Number (LIN) may optionally be sent to the public network in a SETUP message of an Enhanced 911 call. This information element shall be sent for an Enhanced 911 call whenever an MLTS has users located in more than one ERL. The LIN is sent in

41、addition to the normal ISDN signaling elements that are defined for basic call control. In ANSI T1.628-2000 Normative Reference 8, the LIN is defined as a 10-digit NANP format number. It is equivalent in all respects to the ELIN as utilized in this Standard. 5.2.5.4 Transmitted Callback Number Inclu

42、ded in the SETUP message for an Enhanced 911 call is the Calling Party Number (Charge Number) IE that contains the “callback number” to the caller or, if applicable, to the station(s) located in the respective ERL. 5.2.5.5 911 Call Hold When a 911 call is connected using an ISDN trunk interface, the

43、 PSTN requires the cooperation of the MLTS in order to provide end-to-end control of 911 Call Hold. This is necessary due to the existing ISDN signaling standards that do not permit the public network to reject or ignore a disconnect request received from an MLTS when the MLTS initiates clearing of

44、an ISDN call. MLTS support of the 911 Call Hold function is classified as optional from the perspective of the public network, as defined in ANSI T1.628a -2001 Normative Reference 9. When a 911 call is connected to an ISDN trunk interface by an MLTS that supports the 911 Call Hold function and the 9

45、11 caller goes on-hook, the MLTS shall inhibit the sending of a DSS1 clearing message and reserve the speech path of ISDN trunk interface. One of the following events may occur while the speech path is being reserved by the MLTS: 1. The originator of the 911 may return off-hook in which case he/she

46、shall be reconnected to the reserved speech path of ISDN trunk interface. 2. The PSAP agent may initiate release of the 911 call, which will result in the PSTN sending a DSS1 clearing message (e.g., DISCONNECT) to the MLTS. Upon receipt of the clearing message, the MLTS shall release the reserved sp

47、eech path. 3. The PSAP agent may invoke the Ringback function, which shall cause alerting to be applied to the 911 callers on-hook telephone. See Section 5.1.6. The MLTS should implement safeguards to prevent a speech path from being held in reserve indefinitely. The safeguard can be implemented usi

48、ng a timer that is started when the 911 caller goes on-hook and is normally stopped when any of the three conditions described above occur. If the timer expires, the MLTS shall clear the reserved speech path and send the appropriate DSS1 clearing message (e.g., DISCONNECT) for the reserved B-channel

49、 to the PSTN. TIA-689-A 245.2.5.6 Ringback When the PSAP agent initiates Ringback, the ringback request is signaled through the public network toward the originator of the 911 call using the signaling path of the connection that is being maintained by 911 Call Hold. The public network will send a DSS1 FACILITY message to the MLTS. The DSS1 FACILITY message will include a Facility Information Element coded with the ringback request operation, as defined in ANSI T1.628a-2001 Normative Reference 9. Support of the ringback request operation by the M