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Nortel Meridian PBX and Cisco Call Manager Integration

With today's open interfaces and Call center solutions many firms are looking at cross platform solutions which will address the needs of their strategic call center solutions.  Let's look at what it takes to configure a combined Nortel and Cisco solution for a customer.

The following configuration is taken from a Nortel Meridian 1 Option 81c private branch exchange (PBX), running Release 2337.  A T1 Primary Rate Interface (PRI) was defined for connecting a DT24+ Voice over IP/Time Division Multiplexing (VoIP/TDM) gateway. 

A NT-6D80AB 4 port Multiple Serial Data Link (MSDL) was used to provide D-channel framing for the PRI.
There are three generations of PRI cards:

  • The oldest one supports one PRI and requires one serial port on the MSDL for the D-channel.
  • The next generation supports 2 PRIs and requires two serial ports on the MSDL for the D-channel.
  • The newest one supports one PRI and does not require an MSDL serial port for the D-channel. (It has a high-level data link (HDLC) framer on the card)

This PBX had the second generation PRI card, it required a physical cable to be run from the PRI card to a port on the MSDL.

The DT24+ was set to ISDN Network side, with a switch type of 5E8 Custom. The PBX PRI trunk was set to ISDN User side, with a switch type set to ESS5. This worked and is the configuration show below.  We tried setting the switch type on the PBX trunk to DMS100, but no matter what we did on DT24+, the PBX always saw the trunk as in maintenance mode and calls were rejected.

This trunk was configured for a test scenario.  The extension for the IP phone was x7373 and for the digital phone was x6925.  When calling the IP phone from the digital phone, the access code 8815 was first dialed to select the specific PRI trunk (see ACOD 8815 in LD21 below), then the extension of the IP phone was dialed.  For this test, the configuration allowed a number to be selected for the IP phone that could be uniquely routed.

If you experience any problems after the Tspan is connected, and there are no framing, LOS, or sync errors, you will need to consider the following troubleshooting areas:

  • T1 Layer 1 Troubleshooting
  • T1 Error Events Troubleshooting
  • T1 Alarm Troubleshooting

For the D channel to become active, it does not matter which side (PBX or the VoIP gateway) is set to ISDN USER or NETWORK. Set one device to ISDN USER and the other to NETWORK.

At this point Layer 1 will be active. For Layer 2 to initialize, each side will send Q.921 SABME frames. One side will respond with a Q.921 UA UnAcknowledged message, after which both sides will begin to exchange Receiver Ready (RR) messages. At this point Layer 2 connectivity is established.

For further explanation of the PBX commands, we refer to Nortel's "Administration Input/Output Guide for Meridian 1" and Nortel's "1.5 mb DT1/PRI Administration and Maintenance Guide".

Typical Configuration for T1 Settings

D Signaling Channel Configuration
Configuration Parameters                                    Comments
>LD 22                                  load overlay module 22 to print an i/o device report
REQ  PRT                                @ Request prompt, enter "PRT" to print
TYPE ADAN DCH 8                         @ Type prompt, enter:
                                         "ADAN" for all i/o devices
                                         "DCH" to specify D-channel devices
                                         "8" to for the D-channel with ID #8
ADAN     DCH 8                          configuration for i/o D-channel 8
  CTYP MSDL                             card type - Mutiple Serial Data Link
  GRP  1                                System group - 1
  DNUM 12                               i/o device number - 12
  PORT 3                                physical port - 3
  DES  CISCO                            description
  USR  PRI                              D channel - PRI only
  DCHL 115                              the PRI card - aka "loop" - the channel is for
  OTBF 32                               default - 32 output request buffers
  PARM RS422  DTE                       default - physical interface type
  DRAT 64KC                             default - physical interface rate
  CLOK EXT                              default - physical interface clocking
  NASA NO                               default - Network Attendant Service Allowed?
  IFC  ESS5                             Interface - aka "switch type"
  SIDE USR                              IDSN "side" - ie either USR or NET
  CNEG 1                                default - Channel Negotiation Option
  RLS  ID  36                           release ID of the switch at the far end of the D-channel - 
                                        36, use 23 for SL1 <-> SL1
  RCAP ND2                              Remote D-channel Capabilities - name display 2
  T200 3                                default - retransmission Timer
  T203 10                               default - max Time secs without frames being exchanged
  N200 3                                default - max Number of retransmmissions
  N201 260                              default - max Number of octets in information field
  K    7                                default - max number of outstanding frames
REQ  ****                               type **** to exit overlay module 22
B Bearer Channel Configuration


>LD 20                                  load overlay module 20 to print a Terminal Number Block 

REQ: PRT                                @ Request prompt, enter "PRT" to print
TYPE: TNB                               @ Type prompt, enter "TNNB" for Terminal Number Block
TN   115 1                              @ TN prompt, enter:
                                         "115" to specify Terminal Number Block - aka "loop" # 115 
                                         aka PRI card 115
                                         "1" to specify B-channel #1, could be 1-23

TN   115 01                             configuration for TNB 115, B channel 1
TYPE TIE                                type of trunk - TIE, could be DID ..., see LD 14 
CDEN SD                                 default - card port density - single density
CUST 0                                  Customer number - 0 get operator "x", 1 get "Y", ...
NCOS 0                                  Network Class Of Service group - 0, change if trouble 
                                        calling in or out
RTMB 115 1                              Route Number and Member Number - member 1, could be 
                                        2...23, of route block number 115
TGAR 1                                  Trunk Group Access Restriction - 0-31, 1 in this case
AST  NO                                 default - Associated Trunk for CTI trunk monitoring and 
                                        control? - no
IAPG 0                                  default - Event Group for USM message 0-15
CLS  CTD DIP WTA LPR APN THFD HKD       default - Class of Service:
     P10 VNL                             CTD - Conditionally Told Denied
                                         DIP - Dial Pulse
                                         WTA - Warning Tone Allowed
                                         LPR - Low Priority
                                         APN - ACD Priority Not Required
                                         THFD - Centrex Switchhook Flash Denied
                                         HKD - Hong Kong DTI Denied
                                         P10 - 10 pulses per second
                                         VNL - Via Net Loss, see LD14
TKID                                     default - Trunk Identifier - like to refernce a 
                                         circuit ID
DATE 14 JUN 2000                         default - date of this report

NACT ****                               type **** to exit overlay module 20
Call Routing Configuration


>LD 21                                  load overlay module 21 to print a Route Data Block report
REQ  PRT                                @ Request prompt, entered "PRT" to print
TYPE: RDB                               @ Type prompt, entered "RDB" for Route Data Block
CUST 0                                  Customer number - 0 get operator "x", 1 get "Y", ...
ROUT 115                                Route Number - 0-127, 0-511 - 115, matches Terminal Block 
                                        Number above
TYPE RDB                                Route Data Block
CUST 00                                 Customer number - 0
ROUT 115                                Route Number - 115
DES  CISCO                              description
TKTP TIE                                type of trunk - TIE, could be DID ..., see LD 14        
ESN  NO                                 default - Electronic Switched Network pad control? - no
CNVT NO                                 default - Conventional switch route? - no
SAT  NO                                 default - Satellite used for trunk route?
RCLS EXT                                default - Route Class marked as external?
DTRK YES                                Digital Trunk Route? - yes
DGTP PRI                                Digital Trunk Type for route - PRI, could be BRI ...
ISDN YES                                ISDN? - yes
    MODE PRA                            Mode of operation - PRA, could be ISLD ..., see LD16
    IFC  ESS5                           Interface Type for this PRI route - ESS5, could be S100, 
                                        D100, ...
    SBN  NO                             default - Send Billing Number?
    PNI  00000                          default - Private Network Identifier?, see LD16
    SRVC NNSF                           default - Service type provisioned - No Network Specific 
                                        Facility NNSF, could be M800, IWAT, ...
    NCNA YES                            default - Network Calling Name Allowed? - yes
    NCRD NO                             default - Network Call Redirection Allowed? - no
    CHTY BCH                            Channel Type - BCH, could be ABCH
    CTYP UKWN                           default - Call Type for outgoing direct dialed TIE route-
                                        Unknown, could be INTL, NXX, ...
    INAC NO                             default - Insert ESN Access Code to incoming private 
                                        network call? - no
    ISAR NO                             default - Integrated Service Access Route denied? - no
    TGAR 1                              Trunk Group Access Restriction - 0-31, 1 in this case
    BCOT 0                              default - B-channel Overload Control Timer - 0
DSEL VOD                                default - Data Selection - Voice or Data Route VOD
PTYP PRI                                Port Type at far end - PRI, could be ATT, ACO, ...
AUTO NO                                 default - Auto-Terminate? - no, terminate normally.
DNIS NO                                 default - ACD DNIS route?
DCDR NO                                 default - Include DNIS in CDR records? related to ACD- no
ICOG IAO                                Incoming and/or Outgoing trunk - IAO, could be ICT, OGT
SRCH LIN                                default - Linear Hunting Search Method for outgoing trunk 
                                        member - LIN, could be RRB       
TRMB YES                                default - Tromboning allowed? - yes
STEP                                    default - Alternate trunk route for outgoing trunks - " ",
                                        could be 0-511
ACOD 8815                               Access code for the trunk route - 8815 - see note above
TCPP NO                                 default - CPP flag for incoming non-ISDN trunk call 
                                        tandemed to this trunk - no
PII NO                                  default - Calling Privacy Indicator Ignored? - no
TARG 01                                 Trunk Access Restriction Group - match "TGAR" - 1
CLEN 1                                  default - Calling Line ID entry number - 1
BILN NO                                 default - Billing Number required? - no
OABS                                    default - Actual Outgoing toll digits to be ignored for 
                                        code restriction - " ", could be 0-9.
INST                                    default - Insert - " " = no digits are entered
ANTK                                    default - ANI identifier number
SIGO STD                                default - Signaling arrangement - std, could be ESN3, ...
ICIS YES                                default - Incoming Identifier Send - yes
TIMR ICF 512                            default - Trunk timer: Incoming Flash - 512ms
     OGF 512                            default - Trunk timer: Outgoing Flash - 512ms
     EOD 13952                          default - Trunk timer: End of Dial - 13952ms
     NRD 10112                          default - Trunk timer: No Ringing Detector - 10112ms
     DDL 70                             default - Trunk timer: Dial Delay - 70ms
     ODT 4096                           default - Trunk timer: End of dial for DIGITONE trunks - 
     RGV 640                            default - Trunk timer: Ring Validation - 640ms
     GRD 896                            default - Trunk timer: Guard  - 896ms
     SFB 3                              default - Trunk timer: Seize Fail Busy - 3s
     NBS 2048                           default - Trunk timer: Enblock Short dialing - 2048ms
     NBL 4096                           default - Trunk timer: Enblock Long dialing - 4096ms
    IENB 5                              default - Trunk timer: Idle Extension Notification Block - 
     TFD 0                              default - Trunk timer: Timed Forced Disconnect - 0s
DRNG NO                                 default - North American Distinctive Ringing? - no for tie 
                                        trunks to have normal ringing
CDR  NO                                 default - Call Detail Recording for this route? - no
MUS  NO                                 default - Music on hold? - no
RACD NO                                 default - Route traffic information in ACD reports? - no
OHQ  NO                                 default - Off-Hook Queuing? - no

PAGE 002                                page 2 of this report
OHQT 00                                 default - Off-Hook Queue Threshold - 0s
CBQ  NO                                 default - Call Back Queuing? - no
AUTH NO                                 default - Authorization code to be prompted for incoming 
                                        NARS/BARS calls? - no
TDET NO                                 default - Tone Detector required? - no
PLEV 2                                  default - Priority Level - 2, could be 0-7 for forcing 
                                        override, camp-on, ...
ALRM NO                                 default - Malicious Call Trace Alarm is allowed for 
                                        external calls? - no
ART  0                                  default - Access Restriction Table - 0
SGRP 0                                  default - Scheduled access Restriction Group - 0
AACR NO                                 default - Route Acquired by Application? - no

This will give us a good starting point with which to identify the types of configurations we may need to setup the interface between the Cisco and the Nortel system to address client needs.

For more information or assistance in setting up your network solution, please contact one of our Telecommunications Consultants at (925) 683-7916.

Contact us today to discuss how we can help you!

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              Last modified:  10/04/08                           Paradise Communications                            2005 Paradise Communications