Building a Co-ordinated Dialing Plan (CDP).
When linking PBX's, dialing 4 digits to reach a four digit external extension can be set up using CDP. This will give the caller the impression that the call-destination is "on-switch".
The clue is in the name: Co-ordinated Dialing Plan. Co-ordinated! A good understanding of the local dialing plan is essential. It may be necessary to make some changes to a PBX in order to free up digit blocks and construct a simple, logical dial plan between sites/PBX's.
In this example, the first digit dialed will be used to select the route (DSC - Distant Steering Code), and all of the dialed digits will be sent to line. The "to line" digit string should be manipulated for the destination, not by the destination. It should be valid on the destination PBX.
(Note, to allow DID to TIE connections: LD 15, NET_DATA, set DITI to YES)
Programming a CDB is a three step process:
First build (or modify) the ESN in LD 86 (NEW or CHG, FEAT = ESN) to set the "Maximum number" parameters as required. Set NCDP to 4 for a 4 digit CDP dial pattern (max digits in CDP DN). Do not change AC1 and AC2 (hit return), or any other prompt unless necessary. Hit return until finished.
REQ prt LD 86 CUST 0 FEAT esn Feature = ESN (Electronic switched network) MXLC 100 Max # of Location Codes (NARS only) MXSD 100 Max # of Supplemental Digit restriction blocks MXIX 100 Max # of Incoming Trunk Group exclusion tables MXDM 100 Max # of Digit Manipulation tables MXRL 100 Max # of Route Lists MXFC 100 Max # of Free Calling area screening tables MXFS 100 Max # of Free Special number screening tables MXSC 200 Max # of Steering Codes NCDP 4 # of digits in CDP DN (DSC + DN or LSC + DN) AC1 9 1 or 2 digit NARS/BARS Access Code 1 AC2 80 1 or 2 digit NARS Access Code 2 DLTN NO Dial Tone after dialing AC1 or AC2 ERWT NO Expensive Route Warning Tone TODS 0 00 00 23 59 RTCL DIS NCOS 0 - 0 NCOS 1 - 0 NCOS 2 - 0 NCOS 3 - 0 : :
Next, create a Route List Index (NEW or CHG, FEAT = RLB) in LD 86, pointing to the trunk route (ROUT).
Start from 10, as 0 thru 9 are generally reserved for BARS.
REQ new LD 86 CUST 0 FEAT rlb Feature = RLB (Route list) RLI 10 Route List Index to be accessed ENTR 0 Entry number for NARS/BARS Route list LTER ROUT 10 Use Route number TOD CNV EXP FRL 0 Facility Restriction Level, 0 = no restriction DMI : Hit return until finished :
Last, create the CDP (co-ordinated dialing plan) in LD 87 (NEW or CHG, FEAT = CDP, TYPE = DSC).
DSC - Distant Steering Code = access to remote code, or first digit of DN. Use the Route List (RLI) defined in LD 86.
REQ prt LD 87 CUST 0 FEAT cdp Feature = CDP (Coordinated Dialing Plan) TYPE dsc Type of steering code (aaa = LSC, DSC, or TSC) DSC DSC 2 Distant Steering Code 2 FLEN 0 DSP DN Display (LSC, LOC, or DN) RRPA NO RLI 10 Route List to be accessed for Distant Steering Code NPA NXX
Now, calls to 2XXX will go out on RLI 10/Route 10, and the digits 2XXX will be sent across the D-Channel.
If the DSC was set to 22, calls to 22XX would go out on RLI 10, and digits 22XX sent on the D-Channel.
Difference between DSC, LSC and TSC
DSC Distant Steering Code: Sends call to a remote site through an RLI with all digits dialed. Make sure the ESN Data Block is set correctly. Example 72XXXX sends 72XXXX across the D-Channel to other site.
LSC Local Steering Code: setup at local site will delete digits that are programed as LSC. In above example, would delete the 72 from the dialed number leaving the XXXX.
TSC Trunk Steering Code: allows ACOD to be sent across the network to the remote site, giving access to the route with that ACOD. Example TSC X sends call to remote site where X is the ACOD for the RDB for outcalling.