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