Lucent Technologies DEFINITY Enterprise Communication Server Release 8.2 Administrators Guide

							Managing trunks 
337 Tips for working with trunk groups 
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DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
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Managing trunks
This chapter contains basic procedures for working with analog and digital trunks. 
Specialized trunks such as Internet Protocol (IP) Solution, APLT, tandem, 
release-link, and DMI-BOS trunks are not covered in this manual. For more 
information, refer to DEFINITY ECS Administration for Network Connectivity. 
This chapter also does not contain procedures for working with ISDN trunk 
groups. Due to the complexity of ISDN technology and the potential 
consequences of errors, ask your Lucent representative to assist you in planning, 
installing, and administering ISDN trunks. For an introduction to ISDN service on 
DEFINITY ECS, refer to ‘‘
ISDN service’’ on page 1394. 
Tips for working with trunk groups
You’ll find detailed procedures for administering specific trunk groups elsewhere 
in this chapter. However, there’s more to working with trunks than just 
administering trunk groups.
Following a process
Trunking technology is complex. Following a process can prevent mistakes and 
save you time. To set up new trunks and trunk groups, Lucent recommends 
following the process below (some steps may not apply to your situation):
1. Install the necessary circuit packs and perform any administration the 
circuit pack requires.
2. Connect the appropriate ports to your network service provider’s trunks.
3. Administer a trunk group to control the operation of the trunks.
4. Assign the ports you’re using to the trunk group. 
						

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5. For outgoing or 2-way trunks, administer Automatic Route Selection so 
DEFINITY ECS knows which outgoing calls to route over this trunk 
group.
6. Test your new trunk group. Using the trunk access code, place a variety of 
calls.
This chapter provides instructions for steps 3 and 4 in this process.
Working with your network service provider
Depending on the type of trunk you want to add, the vendor may be your local 
phone company, a long distance provider, or some other service provider. Key 
settings on DEFINITY ECS must be identical to the same settings on the 
provider’s equipment for your trunks to work. Clear, frequent communication 
with your provider is essential — especially since some providers may use 
different terms and acronyms than Lucent does!
Once you decide that you want to add a new trunk, contact your vendor. The 
vendor should confirm the type of signal you want and provide you with a circuit 
identification number for the new trunk. Be sure to record any vendor-specific ID 
numbers or specifications in case you ever have any problems with this trunk.
Keeping records
In addition to recording vendor-specific information such as ID numbers, you 
should record the following information about every trunk group you have.
The questions you need to answer The kind of information you need to get
What type of trunk group is it? You need to know what kind of trunks these are 
(central office (CO), foreign exchange (FX), 
etc.) and whether they use any special services 
(such as T1 digital service). You also need to 
know what kind of signaling the group uses. For 
example, you might have a CO trunk group with 
ground-start signaling running on a robbed-bit 
T1 service. 
						

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339 Tips for working with trunk groups 
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Helpful tips for setting common fields
The procedures in this section cover the specific fields you must administer when 
you create each type of trunk group. Here are some tips for working with common 
fields that are available for most trunk groups.
nDial Access — Typing y in this field allows users to route calls through an 
outgoing or two-way trunk group by dialing its trunk access code.
!SECURITY ALERT:
Calls dialed with a trunk access code over Wide Area 
Telecommunications Service (WATS) trunks are not validated against 
the ARS Digit Analysis Table, so users can dial anything they wish. 
For security, you may want to leave the field set to 
n unless you need 
dial access to test the trunk group. Which phone numbers are associated 
with each trunk group?For incoming or two-way trunk groups:
nWhat number or numbers do outside callers 
use to call into your switch over this group?
nWhat’s the destination extension to which 
this trunk group delivers calls? Does it 
terminate at an attendant or a voice-mail 
system?
For outgoing trunk groups:
nWhat extensions can call out over this trunk 
group?
Is the service from your network 
service provider sending digits on 
incoming calls?Direct Inward Dial and Direct Inward/Outward 
Dial trunks send digits to your switch. Tie trunks 
may send digits, depending on how they’re 
administered. You need to know:
nHow many digits is your service provider 
sending?
nAre you inserting any digits? What are they?
nAre you absorbing any digits? How many?
nWhat range of numbers has your service 
provider assigned you?
The questions you need to answer The kind of information you need to get 
						

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nOutgoing Display — Typing y in this field allows display phones to show 
the name and group number of the trunk group used for an outgoing call. 
This information may be useful to you when you’re trying to diagnose 
trunking problems.
nQueue Length — Don’t create a queue for two-way loop-start trunks, or 
you may have a problem with glare (the interference that happens when a 
two-way trunk is seized simultaneously at both ends).
nTrunk Type — Use ground-start signaling for two-way trunks whenever 
possible: ground-start signaling avoids glare and provides answer 
supervision from the far end. Try to use loop-start signaling only for 
one-way trunks.
Related topics
Refer to the DEFINITY ECS System Description for information on the types of 
circuit packs available and their capacities.
Refer to your switch’s installation manual for installation instructions for circuit 
packs.
Refer to ‘‘
Routing outgoing calls’’ on page 173 for detailed information on 
Automatic Route Selection.
Adding a CO, FX, or WATS trunk 
group
Basic administration for Central Office (CO), Foreign Exchange (FX), and Wide 
Area Telecommunication Service (WATS) trunk groups is identical, so we’ve 
combined instructions for all 3 in the following procedure. In most cases, Lucent 
recommends leaving the default settings in fields that aren’t specifically 
mentioned in the following instructions. Your Lucent representative or network 
service provider can give you more information. Your settings in the following 
fields must match your provider’s settings:
nDirection
nComm Type
nTrunk Type
!CAUTION:
Use the list above as a starting point and talk to your service provider. 
Depending on your particular application, you may need to coordinate 
additional administration with your service provider. 
						

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Before you start
Before you can administer any trunk group, you must have one or more circuit 
packs of the correct type with enough open ports to handle the number of trunks 
you need to add. To find out what circuit packs you need, refer to the DEFINITY 
ECS System Description.
Instructions
As an example, let’s set up a two-way CO trunk group that carries voice and 
voice-grade data only. Incoming calls terminate to an attendant during business 
hours and to a night service destination the rest of the time
To add the new CO trunk-group:
1. Type 
add trunk-group next and press RETURN.
The Trunk Group
 screen appears. The system assigns the next available 
trunk group number to this group. In our example, we’re adding trunk 
group 5.
2. In the Group Type field, type 
co.
This field specifies the kind of trunk group you’re creating.
3. In the Group Name field, type 
Outside calls.
This name will be displayed, along with the group number, for outgoing 
calls if you set the Outgoing Display? field to y. You can type any name up 
to 27 characters long in this field.
 
                                 TRUNK GROUP
Group Number: 5 Group Type: co CDR Reports: y
Group Name: Outside calls COR: 85 TN: 1__  TAC: 105
Direction: two-way Outgoing Display? n
  Dial Access? n Busy Threshold: 99 Night Service: 1234
 Queue Length: 0 Country: 1 Incoming Destination: attd
    Comm Type: voice Auth Code? n  Digit Absorption List: _
     Prefix-1? y                   Trunk Flash? n Toll Restricted? y
 TRUNK PARAMETERS
             Trunk Type: ground start
     Outgoing Dial Type: tone Cut-Through? n
      Trunk Termination: rc Disconnect Timing(msec): 500_
             Auto Guard? n    Call Still Held? n     Sig Bit Inversion: none
                                   Trunk Gain: high
Disconnect Supervision -In? y  Out? n
Answer Supervision Timeout: 10 Receive Answer Supervision? n 
						

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4. Type 85 in the COR field.
This field controls which users can make and receive calls over this trunk 
group. Assign a class of restriction that’s appropriate for the COR calling 
permissions administered on your system.
5. In the TAC field, type 
105.
This field defines a unique code that you or your users can dial to access 
this trunk group. The code also identifies this trunk group in call detail 
reports.
6. In the Direction field, type 
two-way.
This field defines the direction of traffic flow on this trunk group.
7. Type 
1234 in the Night Service field.
This field assigns an extension to which calls are routed outside of business 
hours.
8. In the Incoming Destination field, type 
attd. 
This field assigns an extension to which incoming calls are routed during 
business hours. By entering attd in this field, incoming calls go to the 
attendant and the system treats the calls as Listed Directory Number calls.
9. In the Comm Type field, type 
voice.
This field defines whether a trunk group can carry voice, data, or both. 
Analog trunks only carry voice and voice-grade data.
10. In the Trunk Type field, type 
ground-start.
This field tells the system what kind of signaling to use on this trunk group. 
To prevent glare, ground start signaling is recommended for most two-way 
CO, FX, and WATS trunk groups.
11. In the Outgoing Dial Type field, type 
tone.
This field tells the switch how digits are to be transmitted for outgoing 
calls. Entering tone actually allows the trunk group to support both DTMF 
and rotary signals, so Lucent recommends that you always put tone in this 
field.
12. In the Trunk Termination field, type 
rc.
Use rc in this field when the distance to the central office or the switch at 
the other end of the trunk is more than 3,000 feet. Check with your service 
provider if you’re not sure of the distance to your central office.
13. Press 
ENTER to save your changes.
Now you’re ready to add trunks to this trunk group. Refer to ‘‘
Adding trunks to a 
trunk group’’ on page 355. 
						

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Adding a DID trunk group
In most cases, Lucent recommends leaving the default settings in fields that aren’t 
specifically mentioned in the following instructions. Your Lucent representative or 
network service provider can give you more information. For Direct Inward 
Dialing (DID) trunk groups, settings in the following fields must match your 
provider’s settings:
nDirection
nComm Type
nTrunk Type
nExpected Digits (only if the digits your provider sends do not match your 
dial plan) 
!CAUTION:
Use the list above as a starting point and talk to your service provider. 
Depending on your particular application, you may need to coordinate 
additional administration with your service provider.
Before you start
Before you can administer any trunk group, you must have one or more circuit 
packs of the correct type with enough open ports to handle the number of trunks 
you need to add. To find out what circuit packs you need, refer to the DEFINITY 
ECS System Description.
Tip:
In the DID/Tie/ISDN Intercept Treatment field on the Feature-Related 
System parameters screen, enter 
attd. Incoming calls to invalid extensions 
will be routed to the attendant.
Instructions
To add the new Direct Inward Dialing (DID) trunk-group:
1. Type 
add trunk-group next and press RETURN.
The Trunk Group
 screen appears. The system assigns the next available 
trunk group number to this group. In our example, we’re adding trunk 
group 5. 
						

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2. In the Group Type field, type did.
This field specifies the kind of trunk group you’re creating.
3. In the Group Name field, type 
Incoming calls.
You can type any name up to 27 characters long in this field.
4. Type 
85 in the COR field.
This field controls which users can receive calls over this trunk group. 
Assign a class of restriction that’s appropriate for the COR calling 
permissions administered on your system.
5. In the TAC field, type 
105.
This code identifies the trunk group on CDR reports.
6. In the Trunk Type field, type 
wink-start.
This field tells the system what kind of signaling to use on this trunk group. 
In most situations, use wink start for DID trunks to minimize the chance of 
losing any of the incoming digit string.
7. In the Incoming Dial Type field, type 
tone.
This field tells the switch how digits are transmitted for incoming calls. 
Entering tone actually allows the trunk group to support both DTMF and 
rotary signals, so Lucent recommends that you always put tone in this field.
8. In the Trunk Termination field, type 
rc.
Use rc in this field when the distance to the central office or the switch at 
the other end of the trunk is more than 3,000 feet. Check with your service 
provider if you’re not sure of the distance to your central office.
 
                                TRUNK GROUP                                      
                                                                                 
Group Number: 5   Group Type: did  CDR Reports: y
Group Name: Incoming calls COR: 85 TN: 1 TAC: 105
Country: 1 
Auth Code? n 
                                                                                 
TRUNK PARAMETERS                                                                 
Trunk Type: wink-start Incoming Rotary Timeout(sec): 5 
Incoming Dial Type: tone
Trunk Termination: rc   Disconnect Timing(msec): 500
Digit Treatment: insertion   Digits: 6
Expected Digits: 4 Sig Bit Inversion: none
Analog Loss Group: ___  Digital Loss Group: ___
Extended Loop Range? n  Trunk Gain: high  Drop Treatment: silence
                                                                                 
 Disconnect Supervision - In? y 
						

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9. Press ENTER to save your changes.
Now you’re ready to add trunks to this trunk group. Refer to ‘‘
Adding trunks to a 
trunk group’’ on page 355.
Related topics
Refer to ‘‘
Inserting and absorbing digits’’ on page 359 for instructions on 
matching modifying incoming digit strings to match your dial plan.
Adding a DIOD trunk group
Administration for Direct Inward and Outward Dialing (DIOD) trunk groups 
varies from country to country. Refer to DEFINITY ECS Application Notes for 
Type Approval, and use the DS1 screen illustrations in the chapter for your country 
as a model for your administration. Remember that the central office serving your 
switch may be emulating another country’s network protocol. If so, you’ll have to 
administer your circuit packs and trunk groups to match the protocol used by your 
central office.
!SECURITY ALERT:
If you’re using Incoming Caller ID (ICLID) on analog trunks connected to a 
DIOD Central Office trunk circuit pack, DO NOT put these trunks in an 
outgoing AAR or ARS route pattern. Since the loop-start trunks supported on 
the DIOD Central Office trunk circuit pack do not provide answer 
supervision, the potential for toll fraud exists.
Adding a PCOL trunk group
In most cases, when administering Personal Central Office Line (PCOL) trunk 
groups, Lucent recommends leaving the default settings in fields that aren’t 
specifically mentioned in the following instructions. Your Lucent representative or 
network service provider can give you more information. Your settings in the 
following fields must match your provider’s settings:
nTrunk Type
nTrunk Direction
!CAUTION:
Use the list above as a starting point and talk to your service provider. 
Depending on your particular application, you may need to coordinate 
additional administration with your service provider. 
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
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346 Adding a PCOL trunk group 
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Before you start
Before you can administer any trunk group, you must have one or more circuit 
packs of the correct type with enough open ports to handle the number of trunks 
you need to add. To find out what circuit packs you need, refer to the DEFINITY 
ECS System Description.
Instructions
As an example, let’s set up a new PCOL group and administer the group as a CO 
trunk for two-way voice traffic.
To add the new PCOL group:
1. Type 
add personal-co-line next and press ENTER.
The Personal CO Line Group screen appears.
2. In the Group Type field, type 
co.
This field specifies the kind of trunk group you’re creating. PCOL groups 
can be administered as CO, FX, or WATS trunks.
3. In the Group Name field, type 
Outside calls.
This name will be displayed, along with the group number, for outgoing 
calls if you set the Outgoing Display? field to 
y. You can type any name up 
to 27 characters long in this field. (You may want to put the phone number 
here that’s assigned to this trunk.)
                                                                Page 1 of X
                            PERSONAL CO LINE GROUP
 Group Number: 1                    Group Type: co  CDR Reports: y
   Group Name: OUTSIDE CALL  TAC: ____
Security Code: ___ Coverage Path: ____ Data Restriction? _
Outgoing Display? _ 
TRUNK PARAMETERS
Trunk Type: ground-start  Trunk Direction: two-way
Trunk Port: 01D1901_ Disconnect Timing(msec): 500 
Trunk Name: __________  Trunk Termination: rc____
Outgoing Dial Type: tone_____ Analog Loss Group: 7
Prefix-1? y Digital Loss Group: _
Answer Supervision Timeout: ___  Receive Answer Supervision? _
Trunk Gain: high  Country: 1
Charge Conversion: 1____
Decimal Point: none__
Currency Symbol: ___
Charge Type: units__