Document ID: 7207
Contents
Introduction
Prerequisites
Requirements
Configure
Configurations
Troubleshoot
Troubleshooting Commands
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Introduction
This configuration is taken from a Nortel Meridian 1 Option 81c private branch exchange (PBX), which runs Release 2337. A T1 Primary Rate Interface (PRI) was defined to connect 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:
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The oldest generation supports one PRI and requires one serial port on the MSDL for the D-channel.
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The next generation supports 2 PRIs and requires two serial ports on the MSDL for the D-channel.
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The newest generation 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 the ISDN Network side with a switch type of 5E8 Custom. The PBX PRI trunk was set to the ISDN User side with a switch type set to ESS5. This worked and is the configuration shown. We tried to set 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 the calls were rejected.
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 is active. For Layer 2 to initialize, each side sends Q.921 SABME frames. One side responds with a Q.921 UA Unacknowledged message. After this, both sides begin to exchange Receiver Ready (RR) messages. At this point, Layer 2 connectivity is established.
For further explanation of the PBX commands, refer to Nortel's "Administration Input/Output Guide for Meridian 1" and Nortel's "1.5 mb DT1/PRI Administration and Maintenance Guide."
Prerequisites
Requirements
There are no specific requirements for this document.
Configure
In this section, you are presented with the information to configure the features described in this document.
This trunk was configured for a test scenario. The extension for the IP phone was x7373 and for the digital phone was x6925. When you called the IP phone from the digital phone, the access code 8815 was first dialed to choose the specific PRI trunk (see ACOD 8815 in LD21), and then the extension of the IP phone was dialed. For this test, the configuration allowed a number to be chosen for the IP phone that can be uniquely routed.
Note: Use the Command Lookup Tool ( registered customers only) to obtain more information on the commands used in this section.
Configurations
This document uses these configurations:
|
D Signaling Channel Configuration |
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|---|---|
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Configuration Parameters |
Comments |
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>LD 22 |
load overlay module 22 to print an i/o device report PT2000 |
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REQ PRT |
@ Request prompt, enter "PRT" to print |
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TYPE ADAN DCH 8 |
@ Type prompt, enter: |
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"ADAN" for all i/o devices |
|
|
"DCH" to specify D-channel devices |
|
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"8" to for the D-channel with ID #8 |
|
|
ADAN DCH 8 |
configuration for i/o D-channel 8 |
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CTYP MSDL |
card type - Mutiple Serial Data Link |
|
GRP 1 |
System group - 1 |
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DNUM 12 |
i/o device number - 12 |
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PORT 3 |
physical port - 3 |
|
DES CISCO |
description |
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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 |
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DRAT 64KC |
default - physical interface rate |
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CLOK EXT |
default - physical interface clocking |
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NASA NO |
default - Network Attendant Service Allowed? |
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IFC ESS5 |
Interface - aka "switch type" |
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SIDE USR |
IDSN "side" - i.e. either USR or NET |
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CNEG 1 |
default - Channel Negotiation Option |
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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 |
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N200 3 |
default - max Number of retransmmissions |
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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 |
|
OVL000 |
|
|
B Bearer Channel Configuration |
|
|---|---|
|
>LD 20 |
load overlay module 20 to print a Terminal Number Block report |
|
PT0000 |
|
|
REQ: PRT |
@ Request prompt, enter "PRT" to print |
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TYPE: TNB |
@ Type prompt, enter "TNNB" for Terminal Number Block |
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TN 115 1 |
@ TN prompt, enter: |
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"115" to specify Terminal Number Block - aka "loop" # 115 aka PRI card 115 |
|
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"1" to specify B-channel #1, could be 1-23 |
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|
SPWD |
|
|
DATE |
|
|
PAGE |
|
|
DES |
|
|
TN 115 01 |
configuration for TNB 115, B channel 1 |
|
TYPE TIE |
type of trunk - TIE, could be DID ..., see LD 14 |
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CDEN SD |
default - card port density - single density |
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CUST 0 |
Customer number - 0 get operator "x", 1 get "Y", ... |
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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 |
|
B-CHANNEL SIGNALING |
|
|
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 |
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CLS CTD DIP WTA LPR APN THFD HKD |
default - Class of Service: |
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P10 VNL |
CTD - Conditionally Told Denied |
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DIP - Dial Pulse |
|
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WTA - Warning Tone Allowed |
|
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LPR - Low Priority |
|
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APN - ACD Priority Not Required |
|
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THFD - Centrex Switchhook Flash Denied |
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HKD - Hong Kong DTI Denied |
|
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P10 - 10 pulses per second |
|
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VNL - Via Net Loss, see LD14 |
|
|
TKID |
default - Trunk Identifier - like to refernce a circuit ID |
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DATE 14 JUN 2000 |
default - date of this report |
|
NACT **** |
type **** to exit overlay module 20 |
|
OVL000 |
|
|
Call Routing Configuration |
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|---|---|
|
>LD 21 |
load overlay module 21 to print a Route Data Block report |
|
PT1000 |
|
|
REQ PRT |
@ Request prompt, entered "PRT" to print |
|
TYPE: RDB |
@ Type prompt, entered "RDB" for Route Data Block |
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CUST 0 |
Customer number - 0 get operator "x", 1 get "Y", ... |
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ROUT 115 |
Route Number - 0-127, 0-511 - 115, matches Terminal Block Number above |
|
TYPE RDB |
Route Data Block |
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CUST 00 |
Customer number - 0 |
|
ROUT 115 |
Route Number - 115 |
|
DES CISCO |
description |
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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 |
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SAT NO |
default - Satellite used for trunk route? |
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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 |
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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? |
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PNI 00000 |
default - Private Network Identifier?, see LD16 |
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SRVC NNSF |
default - Service type provisioned - No Network Specific Facility NNSF, could be M800, IWAT, ... |
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NCNA YES |
default - Network Calling Name Allowed? - yes |
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NCRD NO |
default - Network Call Redirection Allowed? - no |
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CHTY BCH |
Channel Type - BCH, could be ABCH |
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CTYP UKWN |
default - Call Type for outgoing direct dialed TIE route- Unknown, could be INTL, NXX, ... |
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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, ... |
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AUTO NO |
default - Auto-Terminate? - no, terminate normally. |
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DNIS NO |
default - ACD DNIS route? |
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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 |
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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 |
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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 |
|
ABS |
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 |
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NRD 10112 |
default - Trunk timer: No Ringing Detector - 10112ms |
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DDL 70 |
default - Trunk timer: Dial Delay - 70ms |
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ODT 4096 |
default - Trunk timer: End of dial for DIGITONE trunks - 4096ms |
|
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 - 5s |
|
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 |
Troubleshoot
Refer to T1 PRI Troubleshooting for tips to debug PRI trunks.
Note: If you receive an intermittent fast busy signal when you call from an IP phone to a Nortel phone, make sure that you use the R2 analog signaling.
Troubleshooting Commands
The Output Interpreter Tool ( registered customers only) (OIT) supports certain show commands. Use the OIT to view an analysis of show command output.
Note: Refer to Important Information on Debug Commands before you use debug commands.
If you experience any problems after the Tspan is connected, and there are no framing, LOS, or sync errors, refer to these documents for ideas:
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| Updated: Feb 02, 2006 | Document ID: 7207 |