Table Of Contents
Configuring an ISDN BRI NT/TE Interface on Voice Interface Cards and ISDN BRI Voice Modules
Verifying BRI Interface Configuration
Monitoring and Maintaining BRI Interfaces
Configuring an ISDN BRI NT/TE Interface on Voice Interface Cards and ISDN BRI Voice Modules
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:
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Monitoring and Maintaining BRI Interfaces
Feature Overview
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.
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Figure 1 Typical Application Using the ISDN BRI NT/TE Voice Interface Cards or ISDN BRI Voice Modules
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.
Benefits
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:
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Restrictions
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Related Documents
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Supported Platforms
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Prerequisites
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:
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Cisco 2600 and Cisco 3600 series
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Cisco MC3810
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Configuration Tasks
See the following sections for configuration tasks for an ISDN BRI NT or TE interface. Each task is identified as either optional or required:
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Configuring BRI Interfaces
Complete the following steps to configure a BRI interface.
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Step 1
Enter global configuration mode.
Step 2
Configure the global ISDN switch type. For a list of switch types, see Table 1.
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Step 3
or, for the MC3810
Router(config)# interface bri numberEnter 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 addressSpecify 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
(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
(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 voiceConfigure the port for incoming voice calls.
Step 10
Router(config-if)# shutdownRouter(config-if)# isdn layer1-emulate {user | network}Router(config-if)# no shutdownConfigure the Layer 1 port mode emulation and clock settings:
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Step 11
(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
Turn on or off the power supplied from an NT-configured port to a TE device.
Step 13
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
(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)# endExit configuration mode.
Step 18
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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Verifying BRI Interface Configuration
To verify the ISDN BRI interface configuration, complete the following steps.
Step 1
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Router# show running-configBuilding configuration...Current configuration:!version 12.1!no service udp-small-serversservice tcp-small-servers!hostname Router!username xxxx password x 11x5xx07no ip domain-lookupip host Labhost 172.22.66.11ip host Labhost2 172.22.66.12ip name-server 172.22.66.21!...interface BRI1/0no ip addressno ip directed-broadcastisdn switch-type basic-net3isdn overlap-receivingisdn T306 30000isdn skipsend-idverifyisdn incoming-voice voice!interface BRI1/1no ip addressno ip directed-broadcastisdn switch-type basic-net3isdn overlap-receivingisdn T306 30000isdn skipsend-idverifyisdn incoming-voice voice!interface BRI2/0no ip addressisdn switch-type basic-net3isdn overlap-receivingisdn protocol-emulate networkisdn layer1-emulate networkisdn T306-30000isdn sending-completeisdn skipsend-idverifyisdn incoming-voice voice!interface BRI2/1no ip addressisdn switch-type basic-net3isdn overlap-receivingisdn protocol-emulate networkisdn layer1-emulate networkisdn T306-30000isdn sending-completeisdn skipsend-idverifyisdn incoming-voice voice!...
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new3810-1#show running-configBuilding configuration...Current configuration:!version 12.1service timestamps debug uptimeservice timestamps log uptimeno service password-encryption!hostname new3810-1!no logging console!network-clock base-rate 56knetwork-clock-select 2 T1 0network-clock-select 3 system(SCB)network-clock-select 1 BVMip subnet-zero!isdn switch-type basic-net3isdn voice-call-failure 0call rsvp-sync!voice-card 0!controller T1 0mode atmframing esflinecode b8zs!interface BRI1no ip addressisdn switch-type basic-net3isdn protocol-emulate networkisdn layer1-emulate networkisdn incoming-voice voiceisdn T306 30000isdn skipsend-idverifyno cdp enable!interface BRI2no ip addressisdn switch-type basic-net3isdn protocol-emulate networkisdn layer1-emulate networkisdn incoming-voice voiceisdn T306 30000isdn skipsend-idverifyno cdp enable!interface BRI3no ip addressshutdownnetwork-clock-priority lowisdn switch-type basic-net3isdn T306 30000no cdp enable!interface BRI4no ip addressshutdownnetwork-clock-priority lowisdn switch-type basic-net3isdn T306 30000no cdp enable!...Step 2
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router# show interfaces bri 1/0BRI3/1 is up, line protocol is up (spoofing)Hardware is Voice NT or TE BRIMTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,reliability 255/255, txload 1/255, rxload 1/255Encapsulation VOICE, loopback not setLast input 00:00:02, output never, output hang neverLast clearing of "show interface" counters neverInput queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0Queueing strategy: weighted fairOutput 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/sec5 minute output rate 0 bits/sec, 0 packets/sec26110 packets input, 104781 bytes, 0 no bufferReceived 0 broadcasts, 0 runts, 0 giants, 0 throttles0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort0 packets output, 0 bytes, 0 underruns0 output errors, 0 collisions, 5 interface resets0 output buffer failures, 0 output buffers swapped out9 carrier transitions
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new3810-1#show interfaces bri 1BRI1 is up, line protocol is up (spoofing)Hardware is BVMMTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,reliability 255/255, txload 1/255, rxload 1/255Encapsulation HDLC, loopback not setLast input 19:32:19, output 19:32:27, output hang neverLast clearing of "show interface" counters neverInput queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0Queueing strategy: weighted fairOutput 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/sec5 minute output rate 0 bits/sec, 0 packets/sec13282 packets input, 53486 bytes, 0 no bufferReceived 1 broadcasts, 0 runts, 0 giants, 0 throttles0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort13292 packets output, 53515 bytes, 0 underruns0 output errors, 0 collisions, 4 interface resets0 output buffer failures, 0 output buffers swapped out33 carrier transitionsMonitoring and Maintaining BRI Interfaces
Configuration Examples
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.
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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.
Figure 2 Configuration Example Topology
Router A: Connection to a PBX
The following example illustrates the configuration of the BRI interfaces on a Cisco 3640 connecting to a PBX:
interface BRI1/0no ip addressisdn switch-type basic-net3isdn overlap-receivingisdn protocol-emulate networkisdn layer1-emulate networkisdn T306-30000isdn sending-completeisdn skipsend-idverifyisdn incoming-voice voice!interface BRI1/1no ip addressisdn switch-type basic-net3isdn overlap-receivingisdn protocol-emulate networkisdn layer1-emulate networkisdn T306-30000isdn sending-completeisdn skipsend-idverifyisdn incoming-voice voice!ip default-gateway 1.14.0.1ip classlessip route 2.0.0.0 255.0.0.0 Ethernet0/1ip route 2.0.0.0 255.0.0.0 Serial0/1ip route 172.22.66.33 255.255.255.255 Ethernet0/0!!line con 0exec-timeout 0 0transport input noneline aux 0line vty 0 4loginRouter B: Connection to PSTN
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 BRI1/0no ip addressno ip directed-broadcastisdn switch-type basic-ni1isdn twait-disableisdn spid1 14085552111 5552111isdn spid2 14085552112 5552112isdn incoming-voice voiceinterface BRI1/1no ip addressno ip directed-broadcastisdn switch-type basic-ni1isdn twait-disableisdn spid1 14085552111 5552111isdn spid2 14085552112 5552112isdn incoming-voice voice!ip classlessip route 3.0.0.0 255.0.0.0 Ethernet0/1ip route 3.0.0.0 255.0.0.0 Serial0/1ip route 172.21.66.0 255.255.255.0 Ethernet0/0!!!line con 0exec-timeout 0 0transport input noneline aux 0line vty 0 4loginCommand Reference
This section documents new or modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.1 command reference publications.
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line-power
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
no line-power
Syntax Description
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.
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 1router (config-if)# line-powernetwork-clock-priority
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
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.
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 0/1router (config-if)# network-clock-priority highRelated Commands
isdn layer1-emulate
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}
no 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.
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 1router (config-if)# isdn layer1-emulate userRelated Commands
isdn point-to-point-setup
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
no isdn point-to-point-setup
Syntax Description
Defaults
The BRI port sends SETUP messages on the static TEI (TEI 127).
Command Modes
Interface configuration
Command History
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 1router (config-if) # isdn point-to-point-setupRelated Commands
isdn static-tei
To configure a static ISDN Layer 2 terminal endpoint identifier (TEI).
Glossary
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.
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