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This document describes features available with the ISDN Q.931 BRI NT/TE voice modules supported on the Cisco MC3810 multiservice access concentrator, and voice interface cards on Cisco 2600 and Cisco 3600 series modular access routers. This module includes the following sections:
The ISDN BRI NT/TE voice interface card (VIC-2BRI-NT/TE) for the Cisco 2600 and Cisco 3600 series and the ISDN BRI Voice Module (BVM4-NT/TE) for the Cisco MC3810 enable Cisco IOS software to replicate the public switched network interface to a PBX that is compatible with European Telecommunications Standards Institute (ETSI) NET3 and QSIG switch types.
Before this feature, customers with PBXs that implement only the BRI TE interface, have had to make substantial hardware and software changes on the PBX to implement the NT interface. The implementation of an NT interface on the router allows the customer to connect ISDN PBXs and Key Systems to a multiservice network with a minimum of configuration changes on the PBX.
The typical application (see Figure 1) allows Enterprise customers, with a large installed base of legacy telephony equipment, to bypass the public telephone network.
This document describes how to configure an ISDN Basic Rate Interface (BRI) port to be either an NT or TE interface. For complete voice configuration instructions, including VoIP, VoFR, VoATM, see the Multiservice Applications Configuration Guide, Cisco IOS Release 12.1.
The ISDN BRI NT/TE voice interface card for the Cisco 2600 and Cisco 3600 series and the ISDN BRI voice module for the Cisco MC3810 provide these benefits:
Before you can configure a voice interface to emulate an NT interface on a Cisco 2600 or Cisco 3600 series router or Cisco MC3810, you must:
Cisco 2600 and Cisco 3600 series
Cisco MC3810
See the following sections for configuration tasks for an ISDN BRI NT or TE interface. Each task is identified as either optional or required:
Complete the following steps to configure a BRI interface.
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Note These steps include commands for configuring an NT interface or a TE interface. |
| Command | Purpose | |||
|---|---|---|---|---|
Step 1 | Router# configure terminal | Enter global configuration mode. | ||
Step 2 | Router(config)# isdn switch-type switch-type | Configure the global ISDN switch type. For a list of switch types, see Table 1.
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Step 3 | Router(config)# interface bri slot|port or, for the MC3810 Router(config)# interface bri number | Enter interface configuration mode to configure parameters for the specified interface. slot is the location of the voice network module in the router. port is the location of the BRI VIC in the voice network module. Valid values are 0 or 1. number can be from 1 to 4. | ||
Step 4 | Router(config-if)# no ip address | Specify that there is no IP address for this interface. For information about IP addressing, see the Cisco IOS software document, IP and IP Routing Configuration Guide, Cisco IOS Release 12.1. | ||
Step 5 | Router(config-if)# isdn overlap-receiving | (Optional) Activate overlap signaling to send to the destination PBX. In this mode, the interface waits for possible additional call-control information. | ||
Step 6 | Router(config-if)# isdn twait-disable | (Optional) Use this command when the ISDN switch type is basic-ni1. Delay a National ISDN BRI switch a random time before activating the Layer 2 interface when the switch starts up. | ||
Step 7 | Router(config-if)# isdn spid1 spid-number [ldn] | (Optional) Specify a SPID and optional local directory number for the B1 channel. Currently, only the DMS-100 and NI-1 switch types require SPIDs. Although some switch types might support a SPID, Cisco recommends that you set up ISDN service without SPIDs.
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Step 8 | Router(config-if)# isdn spid2 spid-number [ldn] | (Optional) Specify a SPID and optional local directory number for the B2 channel.
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Step 9 | Router(config-if)# isdn incoming-voice voice | Configure the port for incoming voice calls. | ||
Step 10 | Router(config-if)# shutdown
Router(config-if)# isdn layer1-emulate
{user | network}
Router(config-if)# no shutdown
| Configure the Layer 1 port mode emulation and clock settings:
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Step 11 | Router(config-if)# network-clock-priority {low | high}
| (Optional) If this BRI voice port is configured as TE, and you want it to be the first-priority BRI voice port for recovering clock from the network NT device, enter high. The default for the BRI BVM is low. The default for the BRI VIC is high.
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Step 12 | Router(config-if)# [no] line-power | Turn on or off the power supplied from an NT-configured port to a TE device. | ||
Step 13 | Router(config-if)# isdn protocol-emulate
{user | network}
| Configure the Layer 2 and Layer 3 port protocol emulation:
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Step 14 | Router(config-if)# isdn sending-complete | (Optional) Configure the voice port to include the Sending Complete information element in the outgoing call setup message. This command is used in some geographic locations, such as Hong Kong and Taiwan, where the sending complete information element is required in the outgoing call setup message. | ||
Step 15 | Router(config-if)# isdn static-tei tei-number | (Optional) Configure a static ISDN Layer 2 terminal endpoint identifier (TEI). tei-number value can be from 0 to 64. | ||
Step 16 | Router(config-if)# isdn point-to-point-setup | (Optional) Configure the ISDN port to send SETUP messages on the static TEI.
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Step 17 | Router(config-if)# end | Exit configuration mode. | ||
Step 18 | Router# clear interface slot|port or, for the MC3810 Router(config)# clear interface bri number | (Optional) The interface needs to be reset if the static TEI number has been configured in Step 15. slot is the location of the voice network module in the router. port is the location of the BRI VIC in the voice network module. Valid values are 0 or 1. number can be from 1 to 4. |
When you finish configuring one interface, you can repeat the appropriate steps above for the other interfaces.
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Note To complete voice configuration, you will need to setup your voice ports and dial peers. For voice configuration information, see the document Multiservice Applications Configuration Guide, Cisco IOS Release 12.1. |
| ISDN Switch Type | Description |
|---|---|
basic-qsig | PINX (PBX) switches with QSIG signaling per Q.931 |
basic-ts013 | Australian TS013 switches |
basic-1tr6 | German 1TR6 ISDN switches |
basic-nwnet3 | Norwegian NET3 ISDN switches (phase 1) |
basic-net3 | NET3 (TBR3) ISDN, Norway NET3, and New Zealand NET3 switches (covers the Euro-ISDN E-DSS1 signaling system and is ETSI-compliant) |
vn2 | French VN2 ISDN switches |
vn3 | French VN3 ISDN switches |
ntt | Japanese NTT ISDN switches |
basic-nznet3 | New Zealand NET3 switches |
basic-5ess | Lucent Technologies basic rate switches |
basic-dms100 | NT DMS-100 basic rate switches |
basic-ni1 | National ISDN-1 switches |
To verify the ISDN BRI interface configuration, complete the following steps.
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Note The examples show some of the command output that is relevant to BRI configuration tasks. The first example is from a Cisco 2600 series router. |
Router# show running-config Building configuration... Current configuration: ! version 12.1 ! no service udp-small-servers service tcp-small-servers ! hostname Router ! username xxxx password x 11x5xx07 no ip domain-lookup ip host Labhost 172.22.66.11 ip host Labhost2 172.22.66.12 ip name-server 172.22.66.21 ! ... interface BRI1/0no ip address no ip directed-broadcast isdn switch-type basic-net3 isdn overlap-receiving isdn T306 30000 isdn skipsend-idverify isdn incoming-voice voice
! interface BRI1/1no ip address no ip directed-broadcast isdn switch-type basic-net3 isdn overlap-receiving isdn T306 30000 isdn skipsend-idverify isdn incoming-voice voice
! interface BRI2/0no ip address isdn switch-type basic-net3 isdn overlap-receiving isdn protocol-emulate network isdn layer1-emulate network isdn T306-30000 isdn sending-complete isdn skipsend-idverify isdn incoming-voice voice
! interface BRI2/1no ip address isdn switch-type basic-net3 isdn overlap-receiving isdn protocol-emulate network isdn layer1-emulate network isdn T306-30000 isdn sending-complete isdn skipsend-idverify isdn incoming-voice voice
! ...
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Note This example is from a MC3810. |
new3810-1#show running-config Building configuration... Current configuration: ! version 12.1 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname new3810-1 ! no logging console ! network-clock base-rate 56k network-clock-select 2 T1 0 network-clock-select 3 system(SCB) network-clock-select 1 BVM ip subnet-zero ! isdn switch-type basic-net3 isdn voice-call-failure 0 call rsvp-sync ! voice-card 0 ! controller T1 0 mode atm framing esf linecode b8zs !interface BRI1 no ip address isdn switch-type basic-net3 isdn protocol-emulate network isdn layer1-emulate network isdn incoming-voice voice isdn T306 30000 isdn skipsend-idverify no cdp enable
!interface BRI2 no ip address isdn switch-type basic-net3 isdn protocol-emulate network isdn layer1-emulate network isdn incoming-voice voice isdn T306 30000 isdn skipsend-idverify no cdp enable
!interface BRI3 no ip address shutdown network-clock-priority low isdn switch-type basic-net3 isdn T306 30000 no cdp enable
!interface BRI4 no ip address shutdown network-clock-priority low isdn switch-type basic-net3 isdn T306 30000 no cdp enable
! ...
Step 2 The show interfaces bri command displays information about the physical attributes of the ISDN BRI B and D channels. The term "spoofing" means that the interface is presenting itself to the IOS software as operational.
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Note The following is sample output from the show interfaces bri command for a BRI voice port on a Cisco 2610. |
router# show interfaces bri 1/0
BRI3/1 is up, line protocol is up (spoofing)
Hardware is Voice NT or TE BRI
MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation VOICE, loopback not set
Last input 00:00:02, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/0/16 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
26110 packets input, 104781 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 5 interface resets
0 output buffer failures, 0 output buffers swapped out
9 carrier transitions
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Note The following is sample output from the show interfaces bri command for a BRI voice port on a MC3810. |
new3810-1#show interfaces bri 1
BRI1 is up, line protocol is up (spoofing)
Hardware is BVM
MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Last input 19:32:19, output 19:32:27, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/16 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
13282 packets input, 53486 bytes, 0 no buffer
Received 1 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
13292 packets output, 53515 bytes, 0 underruns
0 output errors, 0 collisions, 4 interface resets
0 output buffer failures, 0 output buffers swapped out
33 carrier transitions
| Command | Purpose |
|---|---|
Router# show controllers bri slot/port or, for a MC3810 Router# show controllers bri number | To display information about the ISDN BRI interface. |
Router# show voice-port summary slot/port or, for a MC3810 Router# show voice-port summary number | To display information about the BRI voice ports. |
Router# show isdn {memory | status | timers}
| To display information about memory, status, and Layer 2 and Layer 3 timers. |
Router# debug isdn q921 | To display data link layer (Layer 2) access procedures that are taking place at the router on the D channel (LAPD) of its ISDN interface. The no form of this command disables debugging output. |
Router# debug isdn q931 | To display information about call setup and teardown of ISDN network connections (Layer 3) between the local router (user side) and the network. The no form of this command disables debugging output. |
The configuration examples included in this section correspond to the topology shown in Figure 2. The routers each include a BRI VIC and a 2-slot voice network module, along with other voice interface cards and modules that are included for completeness. Router A is connected to a PBX through the BRI VIC, and is connected to Router B by a serial Ethernet interface. Router B includes a BRI VIC for connection to the PSTN, in order to process voice calls from off-premises terminal equipment.
For more information about IP configuration, see the IP and IP Routing Configuration Guide, Cisco IOS Release 12.1. For more information about VoIP, VoFR, and VoATM configuration, see the Multiservice Applications Configuration Guide, Cisco IOS Release 12.1.
The following example illustrates the configuration of the BRI interfaces on a Cisco 3640 connecting to a PBX:
interface BRI1/0 no ip address isdn switch-type basic-net3 isdn overlap-receiving isdn protocol-emulate network isdn layer1-emulate network isdn T306-30000 isdn sending-complete isdn skipsend-idverify isdn incoming-voice voice ! interface BRI1/1 no ip address isdn switch-type basic-net3 isdn overlap-receiving isdn protocol-emulate network isdn layer1-emulate network isdn T306-30000 isdn sending-complete isdn skipsend-idverify isdn incoming-voice voice ! ip default-gateway 1.14.0.1 ip classless ip route 2.0.0.0 255.0.0.0 Ethernet0/1 ip route 2.0.0.0 255.0.0.0 Serial0/1 ip route 172.22.66.33 255.255.255.255 Ethernet0/0 ! ! line con 0 exec-timeout 0 0 transport input none line aux 0 line vty 0 4 login
The following example illustrates the configuration of the BRI interfaces on a Cisco 2600 series router for connection to the public ISDN telephone network:
interface BRI1/0 no ip address no ip directed-broadcast isdn switch-type basic-ni1 isdn twait-disable isdn spid1 14085552111 5552111 isdn spid2 14085552112 5552112 isdn incoming-voice voice interface BRI1/1 no ip address no ip directed-broadcast isdn switch-type basic-ni1 isdn twait-disable isdn spid1 14085552111 5552111 isdn spid2 14085552112 5552112 isdn incoming-voice voice ! ip classless ip route 3.0.0.0 255.0.0.0 Ethernet0/1 ip route 3.0.0.0 255.0.0.0 Serial0/1 ip route 172.21.66.0 255.255.255.0 Ethernet0/0 ! ! ! line con 0 exec-timeout 0 0 transport input none line aux 0 line vty 0 4 login
To configure the BRI port to supply line power to the terminal equipment (TE), use the line-power command in interface configuration mode. To disable the line power supply, use the no form of this command.
line-power
Syntax Description
This command has no arguments or keywords.
Defaults
The BRI port does not supply line power.
Command Modes
Interface configuration
Command History
12.0(3)XG This command was introduced. 12.1(3)XI This command was added for the Cisco 2600 and Cisco 3600 series.
Release
Modification
Usage Guidelines
This command is supported only if an installed BRI voice module (BVM) or BRI VIC is equipped to supply line power (phantom power).
This command is used only on a BRI port operating in NT mode. A BRI port operating in TE mode is automatically disabled as a source of line power, and the line-power command is rejected.
When you use the line-power command, the line power provision is activated on a BRI port, if the port is equipped with the hardware to supply line power. When you enter the no line-power command, the line power provision is deactivated on a BRI port.
Examples
The following example configures a BRI port to supply power to an attached TE device:
router (config)# interface bri 1 router (config-if)# line-power
To specify the clocking source for the BRI VIC voice port, use the network-clock-priority command in interface configuration mode. To restore the default (high) clock-recovery priority, use the no form of this command.
Cisco 2600 series and Cisco 3600 series
network-clock-priority {low | high}
no network-clock-priority {low | high}
Syntax Description
low The BRI port does not provide clocking. high The BRI port provides clocking.
Defaults
The BRI VIC port provides clocking (high).
Command Modes
Interface configuration
Command History
12.0(3)XG This command was introduced for the Cisco MC3810. 12.1(3)XI This command was modified for the Cisco 2600 and Cisco 3600 series.
Release
Modification
Usage Guidelines
Because the BRI VIC can support both NT and TE ports, this command allows a "local loop" to be configured for testing. By default the TE port on the BRI VIC receives the clock source to drive the whole BRI (network-clock-priority high). Setting the clock priority to low allows the connected port to provide clocking.
Examples
The following example configures BRI voice port 1 as a first-priority clock source:
router (config)# interface bri 0/1 router (config-if)# network-clock-priority high
Related Commands
network-clock-select Specifies selection priority for the clock sources.
Command
Description
To configure the Layer 1 operation of a BRI voice port as clock master (NT) or slave (TE), use the isdn layer1-emulate command. To restore the default (user), use the no form of this command.
layer1-emulate {user | network}
Syntax Description
user Physical interface operation in clock slave mode (as TE). network Physical interface operation in clock master mode (as NT).
Defaults
Layer 1 port operation is as user (TE functionality as clock slave).
Command Modes
Interface configuration
Command History
12.0(3)XG This command was introduced on the MC3810. 12.1(3)XI This command was introduced on the Cisco 2600 and Cisco 3600 series.
Release
Modification
Usage Guidelines
If you enter the no isdn layer1-emulate network command, the physical layer port operation defaults to user.
Examples
The following example configures the Layer 1 operation of a BRI voice port as the clock slave (TE):
router (config)# interface bri 1 router (config-if)# isdn layer1-emulate user
Related Commands
isdn protocol-emulate Configures the Layer 2 and Layer 3 port protocol of a BRI voice port, or a PRI interface to emulate NT (network) or TE (user) functionality. network-clock-priority Specifies the clocking source for BRI voice ports.
Command
Description
To configure the ISDN port to send SETUP messages on the static TEI, use the isdn point-to-point-setup command. Use the no form of this command to restore the default (user).
isdn point-to-point-setup
Syntax Description
This command has no arguments or keywords.
Defaults
The BRI port sends SETUP messages on the static TEI (TEI 127).
Command Modes
Interface configuration
Command History
12.1(3)XI This command was introduced.
Release
Modification
Usage Guidelines
This command only applies if a static TEI has been activated with the isdn static-tei command.
Examples
The following example configures the BRI port to send SETUP messages on the static TEI:
router (config) # interface bri 1 router (config-if) # isdn point-to-point-setup
Related Commands
isdn static-tei To configure a static ISDN Layer 2 terminal endpoint identifier (TEI).
Command
Description
BRI—basic rate interface. BRI is a two-wire interface between the customer premises equipment (CPE) and the telco end office (EO), and a four-wire interface at the customer premises. BRI service provides two 64-kbps (B) channels for voice or data and one 16-kbps (D) channel for signaling information or data.
ETSI—European Telecommunication Standards Institute. Organization created by the European post, telephone, and telegraphs (PTTs) and the European community (EC) to propose telecommunications standards for Europe
NT—network termination. In ISDN, a device that provides the interface between customer premises equipment and central office switching equipment.
PBX—private branch exchange. Digital or analog telephone switchboard located on the subscriber premises and used to connect private and public telephone networks.
PSTN—Public Switched Telephone Network. General term referring to the variety of telephone networks and services in place worldwide. In the US, it is sometimes called POTS (plain old telephone service).
TE —terminal equipment. Any ISDN-compatible device that can be attached to the network, such as a telephone, fax, or computer.
ISDN—integrated service digital network. Communication protocol that permits telephone networks to carry data, voice, and other source traffic.
Posted: Thu Sep 28 16:03:48 PDT 2000
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