Lucent Technologies DEFINITY Communications System Generic 2.2 And Generic 3 V2 DS1/CEPT1/ISDN PRI Reference Manual

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Layers 2 and 3 
Page 5-25 ISDN PRI Layer 3 
5
G3V2 systems d efine the following  b earer c ap ab ility c lasses:
nVoic e/voic e-g rad e d ata
nMode 0 digital data
nMode 1 digital data
nMode 2 digital data
nMode 3 digital data
nWideband (G3V2 only)
G2.2 systems d efine the following  b earer c apab ility c lasses:
nVo i c e
nVoic e Grad e Data
nMode 0
nMode 1
nMode 2
nMode 3
nUnknown Digital
nUnknown Analog
nMod e 3/2 Ad ap tive
nX. 2 5
Both systems have a separate field  for the information transfer c ap ab ility, either 
restric ted  or unrestric ted d ig ital d ata. For d efinitions of mod es 0, 1, 2, and  3, see 
the 
Dig ital Multip lexed  Interfac e (DMI) Tec hnic al Sp ec ific ation, Issue 3.1, Aug ust 
1986, selec t c od e 500-029. Ask for the most rec ent version. Less rig orous 
d efinitions c an b e found in Tab le 4-8 on p ag e 4-22
.
G2.2 systems p op ulate the b earer c ap ab ility IE in the following  way:
nFor c alls from non-ISDN end p oints to ISDN PRI trunks, the b earer 
c ap ab ility IE is p op ulated  from the b earer c ap ab ility c lass of servic e 
ind ic ated  in field s 15 and  16 of proc ed ure 014, word  1 and  assig ned  to 
the end p oint in p roc ed ure 000, word  3, field  5.
nFor c alls from ISDN end p oints to ISDN PRI trunks, the bearer c ap ability IE 
is p op ulated  b y the end p oint at the time the c all orig inates. Op tion setting s 
on the ISDN set d etermine the various BC IE c odep oints, suc h as transfer 
rate and  information typ e.
G3V2 systems p opulate the BC IE in the following  way: 
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
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Layers 2 and 3 
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nFor c alls from non-ISDN end p oints to ISDN PRI trunks, the b earer 
c ap ab ility IE, exc ep t for the information typ e c od epoint, is p op ulated  
automatic ally b ased  on the typ e of end p oint. For examp le, if the end p oint 
is an MPDM set for mod e 0 op eration, the BC IE is p op ulated  with mod e 0 
c harac teristic s. Two exc ep tions to this rule exist as follows:
— A c all from a mod e 2 end point is routed  to a p attern c ontaining  
voic e preferenc es b ut no mod e 2 preferenc es. In this c ase a 
mod em p ool is inserted  and  the outg oing  ISDN PRI messag e is 
p opulated  b y the BCC and  ITC ad ministration of the p referenc e, not 
the orig inating  end p oint.
— A c all from a voic e end p oint is routed  to a p attern c ontaining  
p referenc es ad ministered  only for d ata (BCCs 1, 2, 3, or 4). In this 
c ase, the outg oing  ISDN PRI message is p op ulated  b y the BCC 
and  ITC ad ministration of the p referenc e, not of the orig inating  
endpoint.
nIn G3V2, the information typ e c od ep oint in the BC IE is c od ed  from the 
ad ministered  ITC field  on the d ata mod ule form.
nAs with G2.2, for c alls from ISDN end p oints to ISDN PRI trunks, the b earer 
c ap ab ility IE is p op ulated  b y the end p oint at the time the c all orig inates. 
Op tion settings on the ISDN set d etermine the various BC IE c od ep oints, 
suc h as transfer rate and  information typ e.
NOTE:
International d ata c alls req uire the information typ e in the BC IE to b e 
c od ed as unrestric ted . In G2.2 and  G3V2 you c an c ontrol this in 
ad ministration.
Sinc e the ways the DEFINITY systems app ly the bearer c ap ab ility c lass involve 
using  b oth the b earer c ap ab ility IE and  the low layer c omp atib ility IE, refer to the 
sec tion ‘‘Low Layer Comp atibility IE’’
 in the sec tion ‘‘User-to-User Information 
Sig naling’’ for the d etails of how these information elements and the BCCs are 
used.
Calling Party Number IE
The DEFINITY systems send  the c alling  p arty numb er in c od eset 0 in the SETUP 
messag e. Its p rimary use is to ind ic ate the c alling  p artys numb er on the 
connected partys station display. The number digits field in the calling party 
numb er is used  to send  the ad d ress of the c alling  p arty. In G2.2, the numb er 
d ig its field  is p op ulated  with the 10 dig it numb er formed  b y ad d ing the last three 
or four d ig its of the c alling  p artys extension to the value entered  in the NPA-NXX 
field s in p roc edure 354, word  3. In G3V2, the numb er d ig its field  is p op ulated  
from the CPN p refix tab le.
At the rec eiving  end , the c ontents of the rec eived  CPN IE c an be either the 
calling partys number or the calling partys billing number. If the call is not 
switc hed  throug h the AT&T network, the c ontents of the CPN IE will always b e the 
c alling  p artys numb er as pop ulated  from the c alling  system. If the c all is  
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
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Layers 2 and 3 
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switc hed  b y AT&T, however, the c alled  p arty has four c hoic es as to how to 
rec eive c alling party numb er or b illing  numb er. The AT&T network c alls these 
op tions features.
Options from the AT&T Network
When provisioning  the AT&T servic e, you must tell the servic e provid ers whic h of 
these features you want. Following  are the features you c an c hoose from:
nC PN  p re f e rre d .  Th is  f e a t u re  t e l ls  t h e  4 ESS t o  se n d  t h e  D EFI N I TY s y st e m  
the c alling  p arty numb er in the CPN IE, if it is availab le. If it is not available, 
the 4ESS send s the b illing  number in the CPN IE.
nBN p referred . This feature tells the 4ESS to send  the DEFINITY system the 
billing number in the CPN IE, if it is available. If it is not available, the 4ESS 
send s the c alling  p arty numb er in the CPN IE.
nC PN  o n l y.  Th is  f e a t u re  t e l ls  t h e  4 ESS t o  s e n d  t h e  D EFI N I TY s y st e m  t h e  
c alling  p arty numb er in the CPN IE, if it is availab le. If it is not availab le, the 
4ESS does not send  the CPN IE.
nB N  o n ly.  Th i s f e a t u re  t e ll s  t h e  4 ESS t o  s e n d  t h e  D EFI N I TY sy s t e m  t h e  
billing number in the CPN IE, if it is available. If it is not available, the 4ESS 
d oes not send  the CPN IE.
In ad d ition to these features, on G3V2 systems you c an ord er the req uest op tion 
from the network. With this op tion the network send s CPN/BN only if req uested  
b y the G3V2 for a g iven c all. This is imp lemented  in the inc oming  c all hand ling  
tab le for the trunk g roup . For examp le, if you subsc rib e to the CPN only feature, 
y o u  c a n  t e ll  t h e  4 ESS,  t h ro u g h  t h e  se t t in g s in  t h e  in c o m in g  c a l l h a n d l in g  t a b l e ,  t o  
send  the CPN only on c alls of a c ertain servic e typ e (for c all-b y-c all trunk g roup s) 
or only on DNIS c alls. To have this c ap ab ility, you must ad minister the Per Call 
CPN/BN
 field s in the inc oming  c all hand ling  tab le and  also p rovision this op tion 
f ro m  t h e  4 ESS.  Fo r  d e t a il s  o n  h o w  t o  i m p le m e n t  t h i s ,  s e e  t h e  s e c t io n  ‘‘Network 
Sp ec ific  Fac ilities IE in U.S.’’. 
NOTE:
If you p rovision the servic e to always d eliver CPN/BN b ut you also req uest it 
on a per-call basis, the request will be rejected.
For the calling (and connected) party numbers to be supplied across a public 
network, the DEFINITY system and  the far end  end p oint must b e on ISDN ac c ess 
to the p ub lic  network. For example, in the U.S. if you rec eive an SDN c all from a 
far-end  switc h that is c onnec ted  to a 4ESS with T1.5 ac c ess, you c annot rec eive 
the c alling  p artys numb er in the CPN IE. Thus, you will rec eive the BN in the CPN 
IE if you sub sc rib e to the BN only, BN p referred  or CPN preferred  features. At 
p resent, SDN servic e and  ACCUNET Switc hed  Dig ital Servic es p rovid e ISDN 
end-to-end capability in the U.S. 
						

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DS1/CEPT1/ISDN PRI Reference  
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Layers 2 and 3 
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Numbering Plan and Type of Number
In ad d ition to number d ig its field , whic h c arries the ad dress of the c aller, the 
c alling  p arty numb er IE also c arries information on the numb ering  p lan and  typ e 
of numb er. These two field s are p op ulated  as follows:
The only exc ep tion to this enc od ing is for c ountry p rotoc ol op tion 3 (Japan) in 
G3V2. In this c ase, b oth the numb ering  p lan id entific ation and  the typ e of 
number fields are coded as unknown. All DEFINITY systems acc ept c alling party 
number IEs regardless of how these two fields are enc oded.
Requirements for Sending CPN IE
In G2.2 systems, to send  the c alling p arty numb er, the NPA-NXX desig nator field  
in p roc ed ure 354, word  3 must b e ad ministered . This d esig nator must also b e 
entered  in p roc ed ure 000 for the c alling  p artys extension. The numb er sent is 
then always of the form NPA-NXX-extension, a 10-d ig it direc t d istanc e d ial (DDD) 
numb er. Also, p roc ed ure 100, word  3, field  8 must b e set to 0
 or 2
 to send  the 
op tional information elements. When set to 2
, the op tional IEs are sent, b ut if the 
trunk g roup  is a DCS trunk g roup on an ISDN fac ility and  an ISDN c all from 
another trunk g roup  is routed  to it, the DCS name messag e is sup p ressed .
In G3V2 systems, to send  the c alling  p arty numb er IE, the CPN prefix tab le form 
must b e ad ministered . This tab le allows you to spec ify the numb er to b e p ut in 
the CPN IE for any given extension. The Send CPN
 field  in the trunk g roup  
sc reen must also b e ad ministered  as y
.
G3V2 CPN Prefix Table. 
Following is an example of how to administer the G3V2 
CPN Prefix Tab le:
Screen 5-1. G3V2 CPN Prefix Table Numbering Plan Identification
ISDN/telep hony numb ering  p lan 
(rec ommend ation E.164/E.163)
Type of Number
National Number
                    CPN PREFIX TABLE
      Ext   Ext     CPN           Total CPN       
      Len   Code  Prefix           Length         
       5    65    61948            10
       5    66    619494            9
       5    67    61949
       5    68    61949 
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
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July 1993
Layers 2 and 3 
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Tab le 5-3 d esc ribes the ad ministration setting s for the ISDN PRI-sp ec ific  field s in 
this ad ministration form:
In G3V2, any numb er of d ig its (from 0 to 15) c an b e sent in the CPN IE b ec ause 
the CPN p refix tab le allows numb ers of variable length to b e formed . In prac tic e, 
you should  always ad minister the CPN in the form of the p ublic  network 
numb ering  p lan for your c ountry. For examp le, if the p ub lic  network numb ering  
p lan is 10 dig its, as in the U.S., and  you ad minister the CPN to b e 7 d ig its 
throug hout your ISDN network, you mig ht rec eive a 7-d ig it CPN over a p ub lic  
network trunk, whic h would be meaning less.
Table 5-3. Field Definitions CPN Prefix Table
Field Remarks
Ext Len This field  and  the next c onstitute a key that determines whic h row 
of the tab le to ap p ly to an extension. Enter the numb er of extension 
d ig its in the d ial p lan. For examp le, if you are on a five d ig it d ial 
p lan, enter 5. You c an also use this tab le if you have a mixed  
numb ering  p lan. The sum of this numb er and  the numb er of d ig its 
in the CPN Prefix
 field must b e a numb er g reater than or eq ual to 
the numb er in the Total CPN Length
 field .
Ext Cod e This field  allows g roup s of extensions to b e ad ministered . If 12 is 
entered  here, for examp le, and  5 was ad ministered in the first field , 
then all extensions of the form 12XXX will matc h this row. If 12 is 
ad ministered  here and  123 is also administered , then all numb ers 
of the form 12XXX exc ep t for 123XX will matc h this row. For 
e xa m p le ,  if  yo u  w a n t e d  a ll  e xt e n s io n s  o f  t h e  f o r m  1 2 XXX e x c e p t  f o r  
123XX to b e sent with the CPN p refix 30346 and  the 123XX 
extensions to b e sent with the CPN p refix 30353, then you would  
ad minister b oth 12 and  123 in this field  in two different rows.
CPN Prefix Enter the d ig its you p rep end  to the least sig nific ant d ig its of the 
extension c od e d ig its to form a CPN of the leng th sp ec ified  in the 
Total CPN Length
 field. For example, in the sample screen 
s h o w n  a b o ve ,  i f  a n y  e xt e n s io n  o f  t h e  f o r m  6 5 XXX p la c e s  o r 
answers a c all, the numb er sent to the other end  will be 
6 1 9 - 4 8 6 - 5 XXX ( 1 0  d i g it s ) .  I n  t h e  se c o n d  ro w  t h e  t o t a l  le n g t h  i s  9  
d ig its. Sinc e the sum of the Ext Len
 field  and  the CPN Prefix
 
field  is g reater than the total CPN leng th, the CPN p refix is 
p rep end ed to the least sig nific ant d igits of the extensions to form a 
9 d ig it CPN. For examp le, the extension 66123, when c onverted  to 
the CPN, would  b ec ome 619494123.
Total CPN Leng th This is the total leng th of the CPN. It c an b e any numb er from 0-15. 
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
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Calling Party Number Display Requirements
In G2.2 systems, the c alling  p arty numb er, if sent from the far end , will always be 
d isp layed . If b oth the c alling  p arty numb er and  the d isp lay IE are sent from the 
far end , both will b e d isp layed . 
In G3V2 systems, the c alling  p arty numb er, if sent from the far end , will always b e 
d isp layed . If b oth the c alling  p arty numb er and  the d isp lay IE are sent from the 
far end , both will b e d isp layed . If only the c alling  p arty numb er is rec eived , the 
d isp lay shows Call From
 and  the number.
In G3V2 systems, the format of the d isp lay on the c alled  p artys terminal d ep end s 
on the ad ministration setting  in the North American Area Code
 field  in the 
d ial p lan form. If this field  ind ic ates an area c od e and  the typ e of numb er field  in 
the IE is not international, the numb er will b e d isp layed  in the NANP format with 
hyp hens (for examp le, 303-538-1526). Otherwise, the numb er will b e d isp layed  
without hyp hens or sp ac es. Also, if the typ e of numb er field  in the IE is 
international, the d isplay will ind icate an international numb er b y displaying  INTL
 
in the MISC ID
 field .
These rules assume the c all d oes not travel over DCS trunk g roup s. If the c all is 
mad e on an ISDN trunk g roup  used  for DCS, the ISDN PRI d isp lay mig ht b e 
overridd en b y the DCS d isp lay. Whenever the DCS d isp lay takes p rec ed enc e, 
the ISDN CPN IE is not d isplayed . See the sec tion ‘‘Disp lay IE’’
 for interac tions 
b etween DCS and  ISDN d isp lays.
Calling Party Number on Tandem Calls
If a c all is tand emed  throug h any G3V2 system, CPN will b e p assed  if the c all 
orig inated  as an ISDN PRI c all and  c ontinued  over ISDN PRI trunks. If, however, 
a c all is tand emed from a non-ISDN trunk to an ISDN trunk, the c alled  p arty will 
d isp lay the trunk g roup  name of the inc oming trunk, if ad ministered .
Called Party Number IE
The DEFINITY systems send  the c alled  p arty numb er in c od eset 0 in the SETUP 
messag e. This IE is always sent without any p rereq uisite ad ministration.
The c alled  p arty numb er IE is not used in ISDN PRI d isp lays. Instead , the 
c onnec ted  numb er IE is d isp layed  when the c onnec tion is mad e. The d ialed 
d ig its ap p ear on the c allers d isp lay as they are being dialed . The c alled  p arty 
numb er IE is, however, p assed  to telemarketing  app lic ations, suc h as ASAI 
gateway.
On inc oming  c alls, G2.2 systems examine the type of number
 field  in the 
c alled  p arty numb er IE to d etermine how to route the c all. G3V2 systems, 
however, ig nore these field s and  route inc oming  c alls b ased  only on the analysis 
of the d ig its rec eived . For examp le, these systems must rec eive the p refix 011 to 
route international c alls c orrec tly. 
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
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When send ing  the c alled  p arty numb er IE, G2.2 systems pop ulate the Number 
Plan ID
 and Type of Number
 field s from ad ministration. You ad minister these 
field s in p roc edure 322, word  1, field s 3 and  4. G3V2 systems, however, 
p opulate these fields automatic ally as follows:
Screen 5-2. G3V2 Called Party Number IE
NOTE:
Exc ep t for the trunk ac c ess c od e (TAC), the c all typ es ab ove are the c all 
typ es assigned  to a d ialed  d ig it string  in the AAR and ARS d ig it analysis 
tab les.
NOTE:
 For Jap an (c ountry op tion 3) the numb er p lan is always enc od ed as 
unknown.
Channel ID IE
The c hannel id entific ation information element, whic h is sent in the SETUP 
messag e and  in several other ISDN messag es, is used  to assoc iate a c all with its 
c orresp ond ing  B c hannel and  c orrespond ing  D c hannel messag es. In a FAS 
interfac e, the interfac e ID c od ep oint in the c hannel ID is imp lied  and  thus is not 
sent. In an NFAS arrang ement, however, the interfac e ID must b e p resent. G2.2 
systems p op ulate the interfac e ID in p roc ed ure 262, word  1, field  13. In an NFAS 
arrang ement, G3V2 systems p op ulate the interfac e ID from the sig naling group  
form.
DEFINITY systems also imp lement the p referred /exc lusive c od ep oint in the 
c hannel ID IE. The c hannel ID information element has a c od ep oint for 
information ind ic ating  whether or not a c hannel is neg otiab le. These two 
c od ep oints are used  to neg otiate a c all to another B c hannel when one is b usy or 
Call Type   Type of Number   Number Plan
TAC         national         ISDN/telephony number plan
int         intl             ISDN/telephony number plan
fnpa        national         ISDN/telephony number plan
hnpa        national         ISDN/telephony number plan
iop         intl             ISDN/telephony number plan
op          national         ISDN/telephony number plan
svc         national         ISDN/telephony number plan
natl        national         ISDN/telephony number plan
unk         unknown          ISDN/telephony number plan
aar         national         ISDN/telephony number plan
iaar        intl             ISDN/telephony number plan
uaar        unknown          ISDN/telephony number plan 
						

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unavailable. In all DEFINITY systems, only c alls on DCS trunk g roup s are c od ed  
as exc lusive. All others are c oded as preferred.
NOTE:
For d etails of how c hannel neg otiation works in g lare situations, see the 
sec tion ‘‘User-Network and  Peer Protoc ols’’
 earlier in this chapter.
The c hannel numb er c od ep oint in the c hannel ID IE id entifies the timeslot the B 
c hannel for the c all oc c up ies on the interfac e. The c irc uit assig nments in trunk 
g roup  ad ministration map  the c irc uit numb er to the timeslot. Thus, on a FAS DS1 
interfac e, c irc uits 1-23 c orresp ond  to timeslots 1-23. On an NFAS DS1 interfac e, 
c irc uits 1-24 map  to timeslots 1-24. On a FAS CEPT1 interfac e, c irc uits 1-15 map  
to timeslots 1-15 and  c irc uits 17-31 map  to timeslots 17-31. On an NFAS CEPT1 
interfac e, c irc uits 1-31 map  to timeslots 1-31. For all c ountry p rotoc ol op tions 
exc ep t for op tion 2 (Australia) the value of the c hannel numb er in the c hannel ID 
IE is the timeslot numb er. In c ountry p rotoc ol op tion 2 on a CEPT1 FAS interfac e, 
however, c hannel numb ers 1-15 map  to timeslots 1-15 b ut c hannel numb ers 
16-30 map to timeslots 17-31. This mapp ing  is automatic ally c omp ensated  for b y 
the c ountry p rotoc ol op tion 2 software. If you are using  an ISDN trac ing  tool to 
d iag nose a p roblem in c ountry op tion 2, however, you mig ht need  to c onsid er 
this mapping.
For further information on this sub jec t, see the sec tion ‘‘Fac ility-Assoc iated  and  
Non-Fac ility Assoc iated  Sig naling ’’ earlier in this c hap ter.
Network Specific Facilities IE in U.S.
The network sp ec ific  fac ilities (NSF) IE, whic h at present is only used  b y p ub lic  
network applications in the U.S., has the following purposes:
nI t  t e l ls  t h e  p u b l ic  n e t w o rk  s w i t c h ,  su c h  a s t h e  4 ESS o r  t h e  5 ESS,  w h i c h  
servic e (suc h as Meg ac om servic e or Ac c unet Switc hed  Dig ital Servic es) 
to ap p ly to the c all. The Facility Coding Value
 field  in the NSF IE 
c arries this information.
nIf the servic e is a p arameterized  servic e, it tells the p ub lic  network switc h 
what p arameters to ap p ly to the c all. Presently, WATS (outwats in the 
ad ministration forms and  p roc ed ures) is the only parameterized  servic e. 
Thus, WATS has a fac ility c od ing  value, like the other servic es, b ut also 
has p arameters assoc iated  with the servic e. These p arameters are the 
b and s ap p lied  to the servic e. WATS c alls to two d ifferent loc ations mig ht 
b e c alls to two d ifferent WATS b and s, whic h would  c ost d ifferent amounts.
nIt tells the p ub lic  network switc h, suc h as the 4ESS or DMS100, whic h 
network feature to ap p ly to the c all. The AT&T network distinguishes 
b etween servic es and  features. The AT&T network features c urrently 
ap plying  to DEFINITY systems are as follows:
— C PN  p re f e rre d .  Th is  f e a t u re  t e l ls  t h e  4 ESS t o  s e n d  t h e  D EFI N I TY 
system the c alling  p arty numb er in the CPN IE, if it is availab le. If it 
i s  n o t  a v a il a b l e ,  t h e  4 ESS s e n d s  t h e  b il li n g  n u m b e r i n  t h e  C PN  I E. 
						

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— B N  p re f e r re d .  Th i s f e a t u re  t e ll s  t h e  4 ESS t o  s e n d  t h e  D EFI N I TY 
system the b illing  numb er in the CPN IE, if it is available. If it is not 
a va il a b le ,  t h e  4 ESS s e n d s  t h e  c a lli n g  p a r t y  n u m b e r  in  t h e  C PN  I E.
— C PN  o n l y.  Th is  f e a t u re  t e l ls  t h e  4 ESS t o  s e n d  t h e  D EFI N I TY s y st e m  
the c alling  p arty numb er in the CPN IE, if it is availab le. If it is not 
a va il a b le ,  t h e  4 ESS d o e s n o t  s e n d  t h e  C PN  I E.
— B N  o n ly.  Th i s f e a t u re  t e ll s  t h e  4 ESS t o  s e n d  t h e  D EFI N I TY sy s t e m  
the b illing  number in the CPN IE, if it is availab le. If it is not 
a va il a b le ,  t h e  4 ESS d o e s n o t  s e n d  t h e  C PN  I E.
— Op erator. This feature ap p lies to c alls on trunk g roups c onnec ted  to 
a loc al exc hang e ISDN switc h. If the op erator c od e is in the NSF on 
an outg oing  c all to the LEC, the c aller will rec eive op erator servic e 
on the c all.
— Presub sc rib ed  c ommon c arrier op erator. This feature ap p lies to 
c alls on trunk g roup s c onnec ted  to an interexc hang e c arriers ISDN 
switc h. If the p resub sc rib ed c ommon c arrier operator c od e is in the 
NSF on an outg oing  c all to the toll switc h, the c aller will rec eive 
op erator servic e on the c all.
— Call-assoc iated  temp orary sig naling  c onnec tion. If the c od e for 
C A- TSC  i s in  t h e  N SF o n  a n  o u t g o i n g  c a ll  t o  t h e  4 ESS,  a  C A- TSC  
will b e req uested  for that D c hannel.
nIt tells the loc al exc hang e switc h whic h interexc hang e c arrier to route the 
c all to (AT&T etc .). This information is c arried  in the Network 
Identification
 field  in the NSF.
nOn inc oming  c alls to G3V2 systems on call-b y-call servic e selection 
trunks, it tells the system what typ e of servic e the c all is so that the 
inc oming  c all hand ling  tab le c an treat it c orrec tly.
G2.2 systems p op ulate the NSF in p roc ed ure 318. The G3V2 systems p op ulate 
the NSF in the routing  pattern form. For example, if a p referenc e is ad ministered  
for accunet
, c alls routed  to that p referenc e will have the value 00110 p ut into the 
Facility Coding Value
 field  in the NSF IE.
G2.2 Implementation
In the G2.2, you must d efine the NSFs in p roc edure 279, word  1. This 
ad ministration sup p lies the fac ility c od ing  value p ortion of the NSF IE. To 
ad minister the network id entific ation, you must, for eac h ISDN send ing  ind ex, 
b uild the network id entific ation, c alled  the IXC in DEFINITY terminolog y, in 
p roc ed ure 321, word  1, field s 7 throug h 11. If field  7 is a 2
 or 3
, then the IXC 
assig ned  in field s 8 throug h 11 will b e used  to p op ulate the network id entifier in 
the NSF. The c omp lete NSF is then assig ned  to a p referenc e in proc ed ure 318, 
word  1, field  9, whic h is the ISDN send ing  ind ex c orrespond ing  to the d esired  
NSF for that p referenc e.  
						

							DEFINITY Communications System Generic 2.2 and Generic 3 V2 
DS1/CEPT1/ISDN PRI Reference  
555-025-107  Issue 1
July 1993
Layers 2 and 3 
Page 5-34 ISDN PRI Layer 3 
5
G3V2 Implementation
G3V2 systems use the following  forms and other system p arameters to p op ulate 
the NSF IE:
nRouting  pattern form
nInc oming  c all hand ling tab le in the trunk g roup  form
nUsag e alloc ation p lan in the trunk g roup form
nNetwork fac ilities form
NSF Implementation in the Routing Pattern Form. 
The following list desc ribes 
how the NSF relates to setting s in the routing  p attern form:
nFor eac h ISDN PRI p referenc e in a routing  p attern, you c an enter the IXC 
for the interexc hang e c arrier that is c arrying  the c all. This p op ulates the 
network id entific ation c od ep oint of the NSF IE. If the trunk g roup  c onnec ts 
d irec tly to an IXCs switc h, the IXC is not need ed . If the trunk g roup is 
c onnec ted  to a LEC switc h, however, and  the c all will eventually b e 
switc hed  to an IXCs switc h, the IXC information will tell the intermed iate 
switc h to route the c all to the ap p ropriate c arrier.
nFor eac h ISDN PRI p referenc e in a routing  p attern, you must enter the 
mnemonic  for the servic e that will use that trunk g roup  if it is a c all b y c all 
trunk g roup . This p op ulates the fac ility c od ing  value c odep oint in the NSF 
IE for outg oing  c alls over that trunk g roup . If you do not enter the servic e, 
the fac ility c od ing  value in the NSF will not be p opulated . For trunk group s 
d edic ated  to a servic e, this is usually no p roblem b ec ause the NSF is 
automatic ally p op ulated . For c all b y c all trunk g roup s, however, the NSF 
must be populated correctly because the trunk group can carry calls of 
d iffering  servic es. The list of valid  servic es for this field  c an b e found  b y 
d isp laying the network fac ilities form.
nIf the servic e/feature mnemonic  is outwats-b nd, you must also ad minister 
the b and  numb er (0-255) for the c all.
NSF Implementation in the Incoming Call Handling Table. 
For calls incoming  
on ISDN PRI trunk g roup s, the system uses the NSF IE to id entify the servic e so 
that the c all c an b e treated  in the inc oming  c all hand ling  tab le in the trunk g roup 
form. The mnemonic  id entifying  the NSF is ad ministered  for eac h typ e of servic e 
that c an be inc oming  on the trunk group . When a c all c omes in on that trunk 
g roup  and  its NSF matc hes the ad ministered  value, that c all is treated  in the way 
d efined  on that row of the table. For examp le, an inc oming  Meg ac om 800 c all to 
a g iven rang e of extensions c ould  b e routed  to a telemarketing  ap p lic ation. This 
tab le ob viously has its g reatest ap p lic ation in c all-b y-c all trunk g roup s. If the 
servic e typ e of the trunk g roup  is not c b c  and  sp ec ial treatment of c alls on that 
trunk g roup  is not req uired , the tab le d oes not have to b e ad ministered . If you 
want sp ec ial treatment for c alls on d ed ic ated  trunk g roup s, however, you must 
enter the servic e/feature.