566 lines
22 KiB
Plaintext
566 lines
22 KiB
Plaintext
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CPE INTERFACE REQUIREMENTS FOR
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SINGLE-STAGE INBAND ANI DELIVERY
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018-0035-01.1F-ER
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MCI
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NETWORK ARCHITECTURE AND REQUIREMENTS ENGINEERING
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NETWORK STANDARDS AND ARCHITECTURE ENGINEERING
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August 8, 1989
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Revision 1.1
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*** FINAL ***
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Copyright MCI COMMUNICATIONS CORPORATION 1989
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PROPRIETARY INFORMATION OF
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MCI TELECOMMUNICATIONS
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Network Standards and Architecture Engineering
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018-0035-01.1F-ER
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REVISION HISTORY
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REV DATE AUTHOR REASON FOR CHANGE
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1.0 6/6/89 A. Patel Draft
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A. Merchant
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1.1 8/8/89 A. Patel Final
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A. Merchant
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PROPRIETARY INFORMATION OF
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MCI TELECOMMUNICATIONS
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TABLE OF CONTENTS
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SECTION PAGE
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1.0 Introduction 1-1
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2.0 Overview 2-1
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2.1 ANI Applications 2-2
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3.0 Terminology 3-1
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4.0 Signaling Sequence 4-1
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4.1 ANI Delivery Using MF Signaling 4-1
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4.2 ANI Delivery Using DTMF Signaling 4-3
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5.0 Timing, Tolerances and Restrictions 5-1
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5.1 Hook Flash 5-1
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5.2 Hits 5-1
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5.3 Wink Start Operation 5-1
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5.3.1 Wink Start Guard 5-2
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5.4 Answer 5-2
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5.5 Incomplete Calls 5-2
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5.6 Glare Resolution 5-2
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5.7 Register Signaling 5-3
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5.7.1 MF Characteristics 5-4
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5.7.2 DTMF Characteristics 5-6
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5.8 Audible Signals 5-8
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5.9 Disconnect 5-8
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5.9.1 Busy Guard Time 5-8
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LIST OF FIGURES
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FIGURE TITLE PAGE
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4-1 ANI Delivery Using MF Signaling 4-2
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4-2 ANI Delivery Using DTMF Signaling 4-4
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LIST OF TABLES
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TABLE TITLE PAGE
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5-1 MF Characteristics 5-4
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5-2 DTMF Characteristics 5-6
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1.0 INTRODUCTION
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This document addresses the technical requirements for PBX/ACD
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vendors who wish to interface with MCI switches to receive ANI.
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Delivery of this ANI between the MCI terminating switch and the
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Customer Premise Equipment (CPE) will be inband, and will be
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supported on dedicated/hard-wired terminations only.
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2.0 OVERVIEW
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Automatic Number Identification (ANI) relates to the identification
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of the telephone number of the calling party at the premise of the
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called party. This document specifies the technical requirements
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necessary for the interface between the MCI terminating switch and
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the CPE.
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Initially, MCI will deliver real time ANI for 800 and 900 service
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calls to the CPE of the called party over dedicated trunks. The
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terminating switch will outpulse this ANI to the CPE using a
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single-stage signaling sequence. See Section 4.0 for details.
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It should also be noted that:
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(1) If a call originates in a foreign country, no ANI or
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originating country code will be delivered to the PBX/ACD.
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(2) If a 800/900 call overflows to an LEC network for call
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completion, no ANI will be delivered to the terminating LEC and
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PBX/ACD.
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(3) If the MCI switch does not receive the full 10-digit ANI from
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the LEC, i.e. if the call originates from a non-conforming end
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office, then the Originating NPA + 555 - 5555 will be outpulsed to
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the CPE.
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If a specific customer subscribes for the real time ANI feature,
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ANI will be delivered to the actual termination of that call. In
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order to receive the ANI, customers need to ensure that all
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possible dedicated trunks and terminating PBX/ACDs, as specified in
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the routing control, are equipped with ANI receiving and processing
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capabilities.
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2.1 ANI Applications
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Some of the current and potential applications are:
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(1) Telemarketing: This generic term includes locating dealer,
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customer service and order taking.
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(2) Financial services: This is a particularly large application
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including customer service, automated balance/credit inquiry,
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financial information retrieval and funds transfer.
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(3) Home Shopping: ANI could be used as an identifier to recover
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the called party profile and appropriately route the call. Payment
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records could be checked.
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However, a few important limitations must be noted at this point.
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(1) As pointed out earlier, ANI cannot be delivered for calls
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originating from non-conforming end offices.
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(2) A customer could originate a call from a telephone with a
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number different from that customer's home or office telephone
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number. Hence no check of the customer's record can be performed
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in this case.
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3.0 TERMINOLOGY
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The following abbreviations, acronyms and terms have been used
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throughout this document.
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( ) Digits in parenthesis may or may not have been
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dialled or outpulsed.
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3/10 3 or 10 digits.
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ACD Automatic Call Distributor.
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ANI Automatic Number Identification.
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CPE Customer Premise Equipment.
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DTMF Dual Tone Multi Frequency.
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KP Start Digit (Key Pulse).
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LEC Local Exchange Carrier.
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MF Multi Frequency.
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NPA Numbering Plan Area
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ST Stop digit.
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TLP Transmission Level Point.
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4.0 SIGNALING SEQUENCE
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This section describes the signaling sequence for the interface
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between the terminating MCI switch and the CPE. Real time ANI will
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be delivered to the 800/900 Service customer during the call setup
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process.
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4.1 ANI Delivery Using MF Signaling
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If the MCI switch determines that ANI is to be delivered for a
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particular call, the switch will perform single-stage signaling as
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specified below. Refer to Fig. 4-1 on page 4-2.
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A. The MCI terminating switch will seize a trunk to the CPE.
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B. The CPE shall respond to the trunk seizure with a wink start
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signal when ready to receive pulsing.
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C. On receipt of the wink start signal from the CPE, the MCI
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switch will outpulse the 10 digit ANI (KP + 10D ANI + ST).
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D. If ANI is not received, the switch will outpulse
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KP + NPA + 555 - 5555 + ST.
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E. When the telephone/terminal answers, an answer off hook signal
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shall be sent from the CPE to the MCI terminating switch.
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F. The MCI switch will cut through the voice path when it
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receives an answer off hook from the CPE.
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G. If the CPE transmits an on-hook towards MCI for at least 350
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ms, the call will be disconnected. Similarly, the MCI switch
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may disconnect the call by transmitting an on-hook for at
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least 350 ms.
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*Note: If the MCI switch does not receive the ANI digits from the
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LEC, the switch will outpulse KP + Originating NPA + 555 -
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5555 + ST to the CPE using MF Signaling.
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Figure 4-1
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ANI DELIVERY USING MF SIGNALING
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4.2 ANI Delivery Using DTMF Signaling
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If the MCI switch determines that ANI is to be delivered for a
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particular call, the switch will perform single-stage signaling as
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specified below. Refer to Fig. 4-2 on page 4-X.
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A. The MCI terminating switch will seize a trunk to the CPE.
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B. The CPE shall respond to the trunk seizure with a wink start
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signal when ready to receive pulsing.
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C. On receipt of the wink start signal from the CPE, the MCI
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switch will outpulse the 10 digit ANI.
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D. If ANI is not received, the switch will outpulse NPA + 555 -
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5555.
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E. When the telephone/terminal answers, an answer off hook signal
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shall be sent from the CPE to the MCI terminating switch.
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F. The MCI switch will cut through the voice path when it
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receives an answer off hook from the CPE.
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G. If the CPE transmits an on-hook towards MCI for at least 350
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ms, the call shall be disconnected. Similarly, the MCI switch
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may disconnect the call by transmitting an on-hook for at
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least 350 ms.
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*Note: If the MCI switch does not receive the ANI digits from the
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LEC, the switch will outpulse the Originating NPA + 555 -
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5555 to the CPE using DTMF Signaling.
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Figure 4-2
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ANI DELIVERY USING DTMF SIGNALING
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5.0 TIMING, TOLERANCES AND RESTRICTIONS
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This sections describes the timing, tolerances and restrictions
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that are applicable to the MCI switch/CPE interface.
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5.1 Hook Flash
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Hook flashes shall not be passed to the MCI switch. All hook flash
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timing shall be handled internally by the CPE.
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5.2 Hits
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A short change in the received supervisory state is called a hit.
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All hits shall be ignored. A hit may be on hook or off hook and is
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dependant on conditions as specified below:
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A. The CPE shall interpret an off hook of less than 150 ms as a
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hit and not a seizure signal.
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B. The MCI switch will interpret an off hook of less than 70 ms
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as a hit and not a wink start signal.
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C. An on hook duration of less than 200 ms shall be interpreted
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as a hit.
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5.3 Wink Start Operation
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The off hook wink (wink start) shall be sent as soon as the CPE
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detects a seizure signal. The CPE shall return the wink start
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signal within 3.5 seconds of the trunk seizure. However, it shall
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not be provided earlier than 100 ms after receiving the seizure
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signal. The off-hook period shall be a minimum of 140 ms and
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maximum of 290 ms. The MCI switch will interpret an off hook
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signal in the range of 100 ms to 350 ms as a wink signal. If the
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MCI switch receives an off hook signal lasting over 350 ms on a two
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way trunk, a glare condition will be interpreted. Glare resolution
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is discussed in Section 5.6.
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5.3.1 Wink Start Guard
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The CPE must be prepared to receive Multi Frequency (MF) or Dual
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Tone Multi Frequency (DTMF) digits 35 ms after the end of the wink-
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start signal. The MCI switch will wait for 50 ms after the end of
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the wink-start signal before initiating the MF or DTMF pulsing.
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Characteristics of these signals are defined in Section 5.7.
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5.4 Answer
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The CPE shall provide a steady off-hook state indicating called
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party answer.
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5.5 Incomplete Calls
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If a time out occurs while waiting for a response from the CPE, the
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MCI switch shall treat the call as follows. If the CPE responds to
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seizure on a trunk with an off-hook longer than 350 ms instead of a
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wink-start signal, a false answer condition is indicated. The MCI
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switch shall try to set up another call using a different circuit
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within the same trunk group. If an idle circuit is not available,
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the switch will try to set up the call on a different trunk group,
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failing which all other routes shall be tried. If all of the above
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fail, the MCI switch shall disconnect the call and return a reorder
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towards the calling party.
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5.6 Glare Resolution
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Glare is a condition resulting from seizure attempts for the same
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two way access line at about the same time by both the MCI switch
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and the CPE. If the returned off hook lasts longer than 350 ms
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instead of a wink start signal, a glare condition will be
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interpreted.
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The MCI switch will always be the controlling end when a glare is
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detected. The CPE shall maintain the outgoing off hook state while
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preparing for reception of address signals from the MCI switch.
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When ready to receive digits, the outgoing off hook signal shall be
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changed to on hook. The outgoing call initiated by the CPE shall
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be re-tried on another trunk.
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5.7 Register Signaling
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The MCI switch supports the following two types of address
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signalling to deliver ANI.
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A. Multi Frequency (MF); and
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B. Dual Tone Multi Frequency (DTMF).
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5.7.1 MF Characteristics
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One of the two types of address signaling that the MCI switch will
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support is the Multi Frequency (MF) type. Conformity with the
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criteria indicated in this subsection will ensure compatibility of
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the signals between the MCI switch and the CPE.
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The MF pulsing system consists of transmitting and receiving
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various combinations of two, and only two, out of five frequencies
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in the voice band. Each combination of two frequencies represents
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a pulse and each pulse represents a digit. This system provides
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sufficient unique combinations to encode 10 digits. A sixth
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frequency is provided for additional control signals. Table 5-1
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identifies the signaling codes.
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Digits Frequencies
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(Hz)
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1
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2 700 + 900
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3 700 + 1100
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4 900 + 1100
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5 700 + 1300
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6 900 + 1300
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7 1100 + 1300
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8 700 + 1500
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9 900 + 1500
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0 1100 + 1500
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KP 1300 + 1500
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ST 1100 + 1700
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Not Used 1500 + 1700
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Not Used 700 + 1700
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Not Used 900 + 1700
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1300 + 1700
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Table 5-1
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MF CHARACTERISTICS
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5.7.1.1 MF Sender Characteristics
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The CPE MF sender shall have the following characteristics.
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A. KP digit duration shall be: 90-120 ms.
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B. All other digit duration shall be: 58-75 ms.
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C. Inter digit duration shall be: 58-75 ms.
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D. Frequency accuracy shall be within: + 1.5% of
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nominal.
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E. The two frequencies of each code shall start and end within: 1
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ms (of each other).
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F. Power output per frequency: -7 +1 dBm at 0 dB TLP.
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G. Power difference between the two frequencies shall not exceed:
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1 dB.
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H. The total power of extraneous signal components shall be
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suppressed to: at least 30 dB below the power level.
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5.7.1.2 MF Receiver Characteristics
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The CPE MF receiver shall have the following characteristics.
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A. KP digit signal duration shall be: 55 ms.
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B. Digit duration shall be: 30 ms (min.).
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C. Inter digit duration shall be: 25 ms (min.).
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D. Frequency accuracy shall be within: +(1.5% + 5 Hz) of
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nominal.
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E. The two frequencies of each code shall start and end within: 4
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ms (of each other).
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F. The receiver shall accept tones within the power levels of: 0
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to -25 dBm.
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(per frequency).
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G. Power difference between the two frequencies shall not exceed:
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6 dB.
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5.7.2 DTMF Characteristics
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The second type of address signaling that the MCI switch will
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support is the Dual Tone Multi Frequency (DTMF) type. Conformity
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with the criteria indicated in this subsection will ensure
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compatibility of the signals between the MCI switch and the CPE.
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The DTMF provides for 16 unique signals. Each signal is composed
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of two voice band frequencies, one from each of two mutually
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exclusive frequency groups consisting of four frequencies each.
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Table 5-2 identifies the signaling codes.
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HIGH-GROUP FREQUENCIES (Hz)
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1209 1336 1477 1633
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697 1 2 3 Not Used
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LOW
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770 4 5 6 Not Used
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GROUP
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852 7 8 9 Not Used
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FREQUENCIES
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941 * 0 # Not Used
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Table 5-2
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DTMF CHARACTERISTICS
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5.7.2.1 DTMF Sender Characteristics
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The CPE DTMF sender shall have the following characteristics.
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A. Digit duration shall be: 50 ms.
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B. Inter digit duration shall be at least: 50 ms.
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C. Time period (cycle time) shall be at least: 100 ms.
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D. Frequency accuracy shall be within: + 1.5% of
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nominal.
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E. Power output per frequency: -7 +0.5 dBm at 0
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dB TLP.
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F. The total power of extraneous signal components shall be
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suppressed to: at least 30 dB
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below the power level.
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5.7.2.2 DTMF Receiver Characteristics
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The CPE DTMF receiver shall have the following characteristics.
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A. Digit duration shall be: 50 ms.
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B. Inter digit duration shall be at least: 50 ms.
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C. Time period (cycle time) shall be at least: 100 ms.
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D. Frequency accuracy shall be within: + 1.5% of
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nominal.
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E. Power output per frequency: -7 +0.5 dBm at 0
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dB TLP.
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F. The receiver shall accept tones within the power levels of: 0
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to -25 dBm.
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5.8 Audible Signals
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The audible call progress tones provided by MCI will have the
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following characteristics:
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A. Busy Tone: 480 Hz plus 620 Hz interrupted at 60 IPM
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at a level of -24 dBmO per frequency.
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B. Reorder Tone (Fast Busy): 480 Hz plus 620 Hz interrupted at 120
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IPM at a level of -24 dBmO per frequency.
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C. Ringback Tone: 440 Hz plus 480 Hz (two seconds on, four
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seconds off) at a level of -19 dBmO per
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frequency.
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5.9 Disconnect
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To disconnect a call the MCI switch will transmit an on hook
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towards the CPE for at least 350 ms. Conversely, the CPE may
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disconnect a call by transmitting an on hook towards the switch for
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at least 350 ms.
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5.9.1 Busy Guard Time
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The timed interval used to ensure trunk release before re-seizure
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is called the guard time. The trunk shall be held busy for that
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300 ms interval and the station shall not accept an incoming call.
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###
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