How does DID works?

[Jeff1215]

DID Range: 123-456-78xx (00~99)
extension range: 7800~7899
Here is the RDB and DID setting:
TYPE RDB
CUST 00
ROUT 1
DES
TKTP DID
M911_ANI NO
M911_TONE NO
NPID_TBL_NUM 0
SAT NO
RCLS EXT
VTRK NO
NODE
DTRK YES
BRIP NO
DGTP PRI
ISDN YES
MODE PRA
IFC NI2
CBCR NO
NCOS 0
SBN NO
PNI 00000
NCNA YES
NCRD NO
CHTY BCH
CPFXS YES
CPUB OFF
DAPC NO
BCOT 0
INTC NO
DSEL 3VCE
PTYP PRI
AUTO NO
DNIS NO
DCDR NO
ICOG IAO
RANX NO
SRCH LIN
TRMB YES
STEP
ACOD 66
TCPP NO
PII NO
TARG 01
CLEN 1
BILN NO
OABS
INST
IDC NO
DCNO 0 *
NDNO 0
DEXT NO
ICIS YES
TIMR ICF 512
OGF 512
EOD 13952
NRD 10112
DDL 70
ODT 4096
RGV 640
FLH 510
GRD 896
SFB 3
NBS 2048
NBL 4096
DRNG NO
CDR NO
MUS YES
MRT 12
RACD NO
EQAR NO
FRL 0 0
FRL 1 0
FRL 2 0
FRL 3 0
FRL 4 0
FRL 5 0
FRL 6 0
FRL 7 0
TDET NO
TTBL 0
ATAN NO
PLEV 2
MCTS NO
ALRM NO
ART 0
SGRP 0
AACR NO
-------------------

DES
TN 004 01
TYPE DID
CDEN SD
CUST 0
TRK PRI
PDCA 1
PCML MU
NCOS 0
RTMB 1 1
B-CHANNEL SIGNALING
NITE
STRI/STRO OWK OWK
AST NO
IAPG 0
CLS UNR DTN WTA LPR APN THFD HKD
P10 VNL
TKID
AACR NO
------------

When 123-456-7800 been dialed, how does PBX route it to 7800 accordingly?
(Since no IDC been configured)
Thanks,

 

[Wane47]

you do not need a idc table unless you are modifying a incoming digits on a pri.

How does it know how to go to 7800? The central office generally sends you the last 4 digits of a did number, you have that number programmed on a set it rings. not programmed it goes to the attendant.

on a pri they can send you as many as 10 digits. you translate the numbers of digits by the length of ldn0. You put a 4 digit ldn in and it only looks at the last 4 digits, you put a 5 digit ldn in and it only looks at the last 5 digits and so forth.

 

[GHTROUT]

DID is essentially a smart TIE line from the central office. When the CO recognizes a call to a DID customer, it points the caller to the trunk group and inserts (for example) the last 4 digits as if it was simply dialing an extension. that's how I think of it.



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[johnpoole]

best way i have found to teach this is very simple.. the switch treats did/tie trunks as if they were analog stations..

idc can be used to change the did.. i dial xxx 7800 and you want your ext to be 1800..

at install both parties agreed that your box would accept 4 digits, tone.. your cdn is 4 digits..


john poole
bellsouth business
columbia,sc

 

[Jeff1215]

Thanks All!
That makes sense.