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Cisco IOS Software Releases 12.0 T

E1 R2 Signaling for the Cisco 3620 and 3640 Series Routers

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E1 R2 Signaling for the Cisco 3620 and 3640 Series Routers

Feature Summary

Benefits

Platforms

Supported MIBs and RFCs

Sample Network Topology

Configuring E1 R2 Signaling

Configure

Step
Command
Purpose

1 

Router(config)# configure t

Enter global configuration to configure E1 R2 for your Cisco 3620 or 3640 router.

2 

Router(config-controller)# controller e1 slot/port

Specify the E1 controller that you want to configure with R2 signaling.

3 

Router(config-controller)# cas-group channel timeslots range type 
{r2-analog | r2-digital | r2-pulse} {r2-compelled [ani] | 
r2-non-compelled [ani] | r2-semi-compelled [ani]}

Configure R2 channel associated signaling on the E1 controller. For a complete description of the available R2 options, see the cas-group (controller e1).

4 

Router(config-controller)# cas-custom channel

Enter cas-custom mode. In this mode, you can localize E1 R2 signaling parameters, such as specific R2 country settings for Hong Kong.

For the customization to take effect, the channel number used in the cas-custom command must match the channel number specified by the cas-group command.

5 

Router(config-ctrl-cas)# country name use-defaults

Specifiy the local country, region, or corporation specification to use with R2 signaling. Replace the name variable with one of the supported country names.

Cisco strongly recommends that you include the use-defaults option, which engages the default settings for a specific country. The default setting for all countries is ITU.

See cas-custom for the list of supported countries, regions, and corporation specifications.

6 

Router(config-ctrl-cas)# ani-digits

Router(config-ctrl-cas)# answer-signal

Router(config-ctrl-cas)# caller-digits

Router(config-ctrl-cas)# category

Router(config-ctrl-cas)# default

Router(config-ctrl-cas)# dnis-digits

Router(config-ctrl-cas)# invert-abcd

Router(config-ctrl-cas)# ka

Router(config-ctrl-cas)# kd

Router(config-ctrl-cas)# metering

Router(config-ctrl-cas)# nc-congestion

Router(config-ctrl-cas)# unused-abcd

Router(config-ctrl-cas)# request-category

(Optional) Further customize the R2 signaling parameters. Some switch types require you to fine tune your R2 settings. Do not tamper with these commands unless you fully understand your switch's requirements.

For nearly all network scenarios, the country name use-defaults command fully configures your country's local settings. You should not need to perform Step 5.

See the cas-custom command reference page for more information about each signaling command.


Verify

Troubleshoot

Configuration Example

Command Reference

cas-custom

Syntax Description

Default

Command Mode

Usage Guidelines

Example 1

Example 2

Example 3

Example 4

Related Command

cas-group (controller e1)

Syntax Description

Default

Command Mode

Usage Guidelines

Examples

What to Do Next


E1 R2 Signaling for the Cisco 3620 and 3640 Series Routers

The following sections are provided:

•Feature Summary

•Platforms

•Supported MIBs and RFCs

•Sample Network Topology

•Configuring E1 R2 Signaling

•Configuration Example

•Command Reference

•What to Do Next

Feature Summary

R2 signaling is an international signaling standard that is common to channelized E1 networks, however, there is no single signaling standard for R2. The ITU-T Q.400-Q.490 recommendation defines R2, but a number of countries and geographic regions implement R2 in entirely different ways. Cisco Systems addresses this challenge by supporting many localized implementations of R2 signaling in its Cisco IOS software.

Cisco System's E1 R2 signaling default is ITU, which supports the following countries: Denmark, Finland, Germany, Russia (ITU variant), Hong Kong (ITU variant), and South Africa (ITU variant). The expression "ITU variant" means there are multiple R2 signaling types in the specified country, but Cisco supports the ITU variant.

Cisco Systems also supports specific local variants of E1 R2 signaling in the following regions, countries, and corporations:

•Argentina

•Australia

•Bolivia

•Brazil

•Bulgaria

•China

•Columbia

•Costa Rica

•East Europe (includes Croatia, Russia, and Slovak Republic)

•Ecuador ITU

•Ecuador LME

•Greece

•Guatemala

•Hong Kong (uses the China variant)

•Indonesia

•Israel

•Laos

•Korea

•Malaysia

•Malta

•New Zealand

•Parguay

•Peru

•Philippines

•Saudi Arabia

•Singapore

•South Africa (Panaftel variant )

•Telmex corporation (Mexico)

•Telnor corporation (Mexico)

•Thailand

•Uruguay

•Venezuela

•Vietnam

Note   Only MICA digital modem modules support R2 functionality. No R2 support is provided for Microcom modems or non-modem applications.

Benefits

Customizing E1 characteristics for R2 has the following benefits:

•R2 custom localization—R2 signaling is supported for a wide range of countries and geographical regions. Cisco is continually supporting new countries.

•Broader deployment of dial access services.

Platforms

These modular access routers support this feature:

•Cisco 3620 router

•Cisco 3640 router

Supported MIBs and RFCs

None.

Sample Network Topology

shows a sample network topology for using E1 R2 signaling with a Cisco 3600. Both controllers on the router are configured with R2 digital signaling. Additionally, localized R2 country settings are enabled on the router. For a sample configuration, see the "Configuration Example" section.

Figure 1 Service Provider using E1 R2 Signaling and a Cisco 3640

Configuring E1 R2 Signaling

R2 is a channelized E1 signaling used in Europe, Asia, and South America. It is equivalent to channelized T1 signaling in North America. There are two types of R2 signaling: line signaling and interregister signaling. R2 line signaling includes R2 digital, R2 analog, and R2 pulse. R2 interregister signaling includes R2 compelled, R2 non compelled, and R2 semi compelled. These signaling types are configured using the cas-group (controller e1) command.

Many countries and regions have their own E1 R2 variant specifications, which supplement the ITU-T Q.400-Q.490 recommendation for R2 signaling. Unique E1 R2 signaling parameters for specific countries and regions are set by entering the cas-custom channel command followed by the country name command.

Cisco's implementation of R2 signaling has DNIS support turned on by default. If you enable the ani option, the collection of DNIS information is still performed. Specifying the ani option does not disable DNIS collection. DNIS is the number being called. ANI is the caller's number. For example, if you are configuring router A to call router B, then the DNIS number is assigned to router B, and the ANI number is assigned to router A. ANI is similar to Caller ID.

Configure

Step
Command
Purpose

1 

Router(config)# configure t

Enter global configuration to configure E1 R2 for your Cisco 3620 or 3640 router.

2 

Router(config-controller)# controller e1 slot/port

Specify the E1 controller that you want to configure with R2 signaling.

3 

Router(config-controller)# cas-group channel timeslots range type 
{r2-analog | r2-digital | r2-pulse} {r2-compelled [ani] | 
r2-non-compelled [ani] | r2-semi-compelled [ani]}

Configure R2 channel associated signaling on the E1 controller. For a complete description of the available R2 options, see the cas-group (controller e1).

4 

Router(config-controller)# cas-custom channel

Enter cas-custom mode. In this mode, you can localize E1 R2 signaling parameters, such as specific R2 country settings for Hong Kong.

For the customization to take effect, the channel number used in the cas-custom command must match the channel number specified by the cas-group command.

5 

Router(config-ctrl-cas)# country name use-defaults

Specifiy the local country, region, or corporation specification to use with R2 signaling. Replace the name variable with one of the supported country names.

Cisco strongly recommends that you include the use-defaults option, which engages the default settings for a specific country. The default setting for all countries is ITU.

See cas-custom for the list of supported countries, regions, and corporation specifications.

6 

Router(config-ctrl-cas)# ani-digits

Router(config-ctrl-cas)# answer-signal

Router(config-ctrl-cas)# caller-digits

Router(config-ctrl-cas)# category

Router(config-ctrl-cas)# default

Router(config-ctrl-cas)# dnis-digits

Router(config-ctrl-cas)# invert-abcd

Router(config-ctrl-cas)# ka

Router(config-ctrl-cas)# kd

Router(config-ctrl-cas)# metering

Router(config-ctrl-cas)# nc-congestion

Router(config-ctrl-cas)# unused-abcd

Router(config-ctrl-cas)# request-category

(Optional) Further customize the R2 signaling parameters. Some switch types require you to fine tune your R2 settings. Do not tamper with these commands unless you fully understand your switch's requirements.

For nearly all network scenarios, the country name use-defaults command fully configures your country's local settings. You should not need to perform Step 5.

See the cas-custom command reference page for more information about each signaling command.


For another E1 R2 configuration example, see "Configuration Example" on page 7.

Verify

To verify the E1 R2 signaling configuration:

•Enter the show controller e1 command to view the status for all controllers, or enter the show controller e1 slot/port command to view the status for a particular controller. Make sure the status indicates the controller is up (line 2 in the following example) and no alarms (line 4 in the following example) or errors (lines 9 and 10 in the following example) have been reported. 

Router# show controller e1 

E1 1/0 is down.

  Applique type is Channelized E1 - balanced

  Transmitter is sending remote alarm.

  Receiver is getting AIS.

  Framing is CRC4, Line Code is HDB3, Clock Source is Line.

  Data in current interval (730 seconds elapsed):

     0 Line Code Violations, 0 Path Code Violations

     0 Slip Secs, 730 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 730 Unavail Secs

  Total Data (last 24 hours)

     0 Line Code Violations, 0 Path Code Violations,

     0 Slip Secs, 21740 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 21740 Unavail Secs

E1 1/1 is up.

  Applique type is Channelized E1 - balanced

  No alarms detected.

  Framing is CRC4, Line Code is HDB3, Clock Source is Line.

  Data in current interval (731 seconds elapsed):

     0 Line Code Violations, 0 Path Code Violations

     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

  Total Data (last 24 hours)

     0 Line Code Violations, 0 Path Code Violations,

     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

• Enter the show modem csm command to view status for a specific modem: 

Router# show modem csm 3/0 

Modem 3/0, line 97 (digital)

CSM status(0): CSM_STATUS_UNLOCKED

CSM current state(0x00000000): IDLE_STATE

CSM last event: ASYNC_DTR_UP, cause: 0x0000

wdt timer is not activated

invalid_events 0, wdt_timeouts 0

ic_failure 0, ic_complete 0, oc_failure 7, oc_complete 0

oc_busy 0, remote_link_disc 2, busyout 0, modem_reset 1

call started 23:56:54, call ended 23:59:26, total modem active time 00:06:14

tty_hwidb 0x61443C94, modem_tty 0x61442680, modem_pool 0x6129E358

total pri d-channels 0, last used pri d-channel 0

total_free_rbs_timeslot 0, total_busy_rbs_timeslot 0, min_free_modem_threshold 6


Troubleshoot

If the connection does not come up, check the following:

•Loose wires, splices, connectors, shorts, bridge taps, and grounds

•Backwards transmit and receive

•Mismatched framing types (for example, CRC-4 verses no-CRC-4)

•Transmit and receive pair separation (crosstalk)

•Faulty line cards or repeaters

•Noisy lines (for example, power and crosstalk)

If you see errors on the line or the line is going up and down, check the following:

•Mismatched line codes (HDB3 vs. AMI)

•Receive level

•Frame slips due to poor clocking plan

If you are still having trouble, enable the modem management Call Switching Module (CSM) debug mode using the debug modem csm command.

This is the debug output for an incoming call: 

Router# debug modem csm 1/0

Modem Management Call Switching Module debugging is on

R2D2#

*Feb 28 19:01:47: Modem 255/255 CSM: received EVENT_CALL_DIAL_IN with call_id 0000

*Feb 28 19:01:47:     src 1/0/0 dest 255/0/255 cause 768

*Feb 28 19:01:47: CSM: Next free modem = 3/18; statbits = 10020

*Feb 28 19:01:47: Modem 3/18 CSM: modem is allocated, modems free=29

*Feb 28 19:01:47: Modem 3/18 CSM: (CSM_PROC_IDLE)<--DSX0_CALL

*Feb 28 19:01:47: Modem 3/18 CSM: 
(CSM_PROC_IC_CAS_CHANNEL_LOCKED)<--CSM_EVENT_MODEM_SETUP

*Feb 28 19:01:47: R2 Incoming Modem(3/18): DSX (E1 1/0:0): STATE: R2_IN_IDLE R2 Got 
Event R2_START

*Feb 28 19:01:47: Modem 3/18 CSM: received EVENT_START_RX_TONE with call_id 0000

*Feb 28 19:01:47:     src 1/0/0 dest 3/0/18 cause 0

*Feb 28 19:01:47: Modem 3/18 CSM: (CSM_PROC_IC_CAS_COLLECT_DIGITS)<--DSX0_START_RX_TONE

.

.

.

When the E1 controller comes up, you will see the following messages: 

%CONTROLLER-3-UPDOWN: Controller E1 0, changed state to up

It also shows these messages for individual timeslots:

%DSX0-5-RBSLINEUP: RBS of controller 1 timeslot 1 is up

%DSX0-5-RBSLINEUP: RBS of controller 1 timeslot 2 is up

%DSX0-5-RBSLINEUP: RBS of controller 1 timeslot 3 is up

%DSX0-5-RBSLINEUP: RBS of controller 1 timeslot 4 is up

%DSX0-5-RBSLINEUP: RBS of controller 1 timeslot 5 is up

%DSX0-5-RBSLINEUP: RBS of controller 1 timeslot 6 is up

%DSX0-5-RBSLINEUP: RBS of controller 1 timeslot 7 is up

%DSX0-5-RBSLINEUP: RBS of controller 1 timeslot 8 is up

.

.

.

Configuration Example

The following example configures R2 signaling and customizes R2 parameters on controller E1 1/0 of a Cisco 3640. In most cases, the same R2 signaling type is configured on each E1 controller.

Step 1 Enter global configuration mode using the configure terminal command: 

Router# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Step 2 Specify the E1 controller that you want to configure with R2 signaling using the controller e1 slot/port global configuration command. A controller informs the router how to distribute or provision individual timeslots for a connected channelized E1 line. You must configure one E1 controller for each E1 line. 

Router(config)# controller e1 1/0

Step 3 Configure channel associated signaling with the cas-group channel timeslots range type signal command. The signaling type forwarded by the connecting telco switch must match the signaling configured on the Cisco 3640. The Cisco IOS configuration options are r2-analog, r2-digital, or r2-pulse. 

Router(config-controller)# cas-group 1 timeslots 1-31 type ?

	r2-analog            R2 ITU Q411

  r2-digital           R2 ITU Q421

  r2-pulse             R2 ITU Supplement 7

The following example specifies R2 ITU Q421 digital line signaling (r2-digital). This example also specifies R2 compelled register signaling and provisions the ANI ADDR option. 

Router(config-controller)# cas-group 1 timeslots 1-31 type r2-digital 
r2-compelled ani

Router(config-controller)#

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 1 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 2 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 3 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 4 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 5 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 6 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 7 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 8 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 9 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 10 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 11 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 12 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 13 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 14 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 15 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 17 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 18 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 19 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 20 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 21 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 22 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 23 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 24 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 25 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 26 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 27 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 28 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 29 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 30 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 31 is up

Note   For a description of the supported R2 signaling options, see the cas-group (controller e1) command reference page. The actual R2 channel associated signaling is configured on the 16th timeslot, which is why the timeslot does not come up in the example output.

Step 4 Customize some of the E1 R2 signaling parameters with the cas-custom channel controller configuration command. This example specifies the default R2 settings for Argentina. See the cas-custom command reference page for a detailed description of these options. 

Router(config-controller)# cas-custom 1

Router(config-ctrl-cas)# ?

CAS custom commands:

  ani-digits        Expected number of ANI digits

  answer-signal     Answer signal to be used

  caller-digits     Digits to be collected before requesting CallerID

  category          Category signal

  country           Country Name

  default           Set a command to its defaults

  dnis-digits       Expected number of DNIS digits

  exit              Exit from cas custom mode

  invert-abcd       invert the ABCD bits before tx and after rx

  ka                KA Signal

  kd                KD Signal

  metering          R2 network is sending metering signal

  nc-congestion     Non Compelled Congestion signal

  no                Negate a command or set its defaults

  request-category  DNIS digits to be collected before requesting category

  unused-abcd       Unused ABCD bit values


Router(config-ctrl-cas)# country ?

  argentina             Argentina

  australia             Australia

  brazil                Brazil

  china                 China

  columbia              Columbia

----cut----

Router(config-ctrl-cas)# country argentina ?

  use-defaults   Use Country defaults

  <cr>


Router(config-ctrl-cas)# country argentina use-defaults

Note   Cisco strongly recommends that you specify your country's default settings. To display a list of supported countries, enter the country ? command. The default setting for all countries is ITU.

Command Reference

This section documents new and modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0(2)T command references.

•cas-custom

•cas-group (controller e1)

cas-custom

To customize E1 R2 signaling parameters for a particular E1 channel group on a channelized E1 line, use the cas-custom controller configuration command. Use the no form of this command to disable the signaling customization.

cas-custom channel
no cas-custom channel

Syntax Description

channel

Specifies a single channel group number, which can be from 0 and 30. This channel group number must match the channel number specified in the cas-group command.


Default

No customized signaling parameters are set. If you do not specify a country name using the country name command, which is described in , ITU is the selected default signal.

Command Mode

Controller configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 12.0(1)T for the Cisco 3600 series routers.

The customization parameters set by the cas-custom channel command are applied to the same channel group number used in the cas-group channel timeslots range type signal command. These channel group numbers must match. Otherwise, the customized features specified by the cas-custom command will not be applied to the cas-group command's configuration. The signaling customization will not take effect. See Example 1.

However, you will not need to configure or set more than one channel group number per E1 line in most cases. Though rarely used, it is possible to split a single E1 (timeslots 1 to 31) into multiple groups (for example, 1 to 15 on group 1 and timeslots 17 to 31 in group 2).

Cisco strongly recommends that you use the use-defaults option when specifying a particular country type. See the country name command in . This additional keyword ensures that all the local country settings are correctly enabled. For example, enter the country greece use-defaults command. If the use-defaults option is not specified, generic ITU will be the default setting for all countries. See Example 2.

You can configure the system to deviate from a country's default settings as defined by Cisco. To do this, choose from the following list of commands described in : ani-digits min number max number, answer-signal {group-a | group-b} number, caller-digits number, category number, dnis-digits min number max number, invert-abcd, ka number, kd number, metering, nc-congestion, and unused-abcd value. To return a country back to its country-specific default settings, enter the country name use-defaults command. To return a country back to the ITU standard, enter the default country name use-defaults command. See Example 3 and Example 4.

Note   Only integrated MICA digital modems support E1 R2 signaling on Cisco 3620 and 2640 series routers.

shows a list of command options in cas-custom mode, which is used to customize R2 signaling settings. Some switches require you to fine tune your R2 settings. Do not tamper with these commands unless you understand exactly how your switch will be effected.

Table 1 Available Commands in Cas-Custom Mode 

CAS Custom Command
Purpose

ani-digits min number max number

Requested number of ANI digits for each call. All calls that do not match the minimum and maximum settings that you specify will be dropped. The minimum number of collected digits is set by min number. Replace the number variable with a value from 0 and 64. The maximum number of collected digits is set by max number. Replace the number variable with a value from 5 and 64. By default, ANI digits are not collected, which is the ITU standard.

answer-signal {group-a | group-b} number

Answer signal to be used. You can specify the group A signal or the group B signal. The signal number can be from 1 to 15. The default is group B is 6, which is the ITU default.

caller-digits number

Specifies the number of digits the router needs to collect before it requests ANI or CallerID information. The digits can be from 1 to 10. The default is 1, which is the ITU default.

category number

Specifies the category type of the incoming call, which is mapped to a group signal number. Signal numbers from 1 to 15 are available. The default is 1, which is the ITU default.

country name use-defaults

Specifies the local country, regional, and some corporation settings for R2 signaling. Replace the name variable with one of the following supported country names. Cisco strongly recommends that you include the use-defaults option, which enables the default settings for a specific country. The default country setting is ITU.

•argentina use-defaults

•australia use-defaults

•bolivia use-defaults

•brazil use-defaults

•bulgaria use-defaults

•china use-defaults

•columbia use-defaults

•costarica use-defaults

•easteurope use-defaults—The easteurope option supports Croatia, Russia, and the Slovak Republic.

•ecuador-itu use-defaults

•ecuador-lme use-defaults

•greece use-defaults

•guatemala use-defaults

•hongkong-china use-defaults— The Hong Kong options uses the China variant.

 

•indonesia use-defaults

•israel use-defaults

•itu—ITU is the signaling default. ITU provides support for the following list of countries: Denmark, Finland, Germany, Russia (ITU variant), Hong Kong (ITU variant), and South Africa (ITU variant).

The expression "ITU variant" means that there are multiple R2 signaling types deployed in the specified country, but Cisco supports the ITU variant.

•korea use-defaults

•laos use-defaults

•malaysia use-defaults

•malta use-defaults

•newzealand use-defaults

 

•paraguay use-defaults

•peru use-defaults

•philippines use-defaults

•saudiarabia use-defaults

•singapore use-defaults

•southafrica-panaftel use-defaults—The South Africa option uses the Panaftel variant.

•telmex use-defaults

•telnor use-defaults—The Telemex and Telnor corporations are supported for Mexico.

•thailand use-defaults

•uruguay use-defaults

•venezuela use-defaults

•vietnam use-defaults

default

Sets a command to its default setting.

debounce-time number

Validates ABCD bit changes. If ABCD bit value changes are shorter than debounce time (in milliseconds), then bit changes are invalid. The value entered here must equal the total for all timers. For example, to achieve a seizure-ack-time of 40, configure debounce-time to 20 and seizure-ack-time to 20.

dnis-digits min number max number

Requested number of DNIS digits for each call. All calls that do not match the minimum and maximum settings that you specify will be dropped. The minimum number of collected digits is set by min number. Replace the number variable with a value from 0 and 64. The maximum number of collected digits is set by max number. Replace the number variable with a value from 5 and 64. By default, DNIS digits are not collected, which is the ITU standard.

exit

Takes you out of cas-custom mode.

invert-abcd

Inverts the ABCD bits before tx and after rx. This feature is disabled by default, which is the ITU default.

ka number

Specifies the KA signal code. Replace the number variable with a value from 1 to 15. The default is 0, which is the ITU default.

kd number

Specifies the KD signal code. Replace the number variable with a value from 1 to 15. The default is 0, which is the ITU default.

metering

Allows the router to correctly handle a metering signal sent by the R2 network. Metering is turned off by default, which is the ITU default.

nc-congestion

Specifies the noncompelled congestion signal. This signal is sent to the central office when the router is congested and cannot accept the call. The default is B4, which is the ITU default.

no

Negates a command or sets its defaults.

release-guard-time number

The time difference in milliseconds between receiving the idle signal and transmitting the idle signal. The count begins once the router receives a clear forward(idle) signal. The release-guard-time command follows the disconnect request for successful calls only.

request-category

DNIS digits to be collected before requesting category. A category specifies different priority levels for different calls within R2, such as data calls verses voice calls. This infomation is primarily used for the switches that forward the calls to the NAS.

For example, India needs the category requested after the first DNIS digit.

seisure-ack-time number

The time difference between the seizure signal and the seizure acknowledgement signal. Used to specify how long the router must wait before transmitting a seizure acknowledgement signal after receiving the seizure signal. Specific to R2 signaling only.

unused-abcd value

Specifies unused ABCD bit values, which can have a 0 or 1 bit value. This feature is disabled by default, which is the ITU default.


Example 1

The following example displays the available signaling parameters after you enter cas-custom mode. Notice that the same channel group 1 is specified in the cas-group command and the cas-custom command. 

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z

router(config)# controller e1 1/0

router(config-controller) cas-group 1 timeslots 1-31 type r2-digital r2-compelled

router(config-controller) cas-custom 1

router(config-ctrl-cas)# ?

CAS custom commands:

  ani-digits          Expected number of ANI digits

  answer-signal       Answer signal to be used

  caller-digits       Digits to be collected before requesting CallerID

  category            Category signal

  country             Country Name

  debounce-time       Debounce Timer

  default             Set a command to its defaults

  dnis-digits         Expected number of DNIS digits

  exit                Exit from cas custom mode

  invert-abcd         invert the ABCD bits before tx and after rx

  ka                  KA Signal

  kd                  KD Signal

  metering            R2 network is sending metering signal

  nc-congestion       Non Compelled Congestion signal

  no                  Negate a command or set its defaults

  release-guard-time  Release Guard Timer

  request-category    DNIS Digits to be collected before requesting category

  seizure-ack-time    Seizure to Acknowledge timer

  unused-abcd         Unused ABCD bit values


Example 2

You can localize your R2 configuration for a specific country. Do not forget to include the use-defaults option as described in . For example, use the country argentina use-defaults command for a R2 scenario in Argentina. 

Router(config-ctrl-cas)# country ?

  argentina             Argentina

  australia             Australia

  bolivia               Bolivia

  brazil                Brazil

  bulgaria              Bulgaria

  china                 China

  columbia              Columbia

  costarica             Costa Rica

  easteurope            East Europe

  ecuador-itu           Ecuador ITU

  ecuador-lme           Ecuador LME

  greece                Greece

  guatemala             Guatemala

  hongkong-china        Hong Kong (China variant)

  indonesia             Indonesia

  israel                Israel

  itu                   ITU

  lao                   Laos

  korea                 Korea

  malaysia              Malaysia

  malta                 Malta

  newzealand            New Zealand

  paraguay              Paraguay

  peru                  Peru

  philippines           Philippines

  saudiarabia           Saudi Arabia

  singapore             Singapore

  southafrica-panaftel  South Africa Panaftel

  telmex                Telmex

  telnor                Telnor

  thailand              Thailand

  uruguay               Uruguay

  venezuela             Venezuela

  vietnam               Vietnam


Router(config-ctrl-cas)# country argentina ?

  use-defaults   Use Country defaults

  <cr>

Router(config-ctrl-cas)# country argentina use-defaults

Example 3

The following example customizes the signaling for channel group 1. The configuration collects 3 digits before it requests ANI information for analog calls received on a Cisco 3640 in Argentina. 

Router(config-controller)# cas-custom 1

Router(config-ctrl-cas)# country argentina use-defaults

Router(config-ctrl-cas)# caller-digits 3

Router(config-ctrl-cas)# exit

Router(config-controller)# ^z

Router(config)#

Example 4

Because cas-custom mode gives you the flexibility to customize R2 parameters, the margin for user error increases. Therefore, the Cisco IOS software enables you to return a country back to its default R2 settings using the use-defaults option. The following example begins by bringing up Argentina's default settings, changing a few customization parameters, and then returning the Argentina R2 setting back to its original state. 

Router(config-ctrl-cas)# country argentina use-defaults

Router(config-ctrl-cas)# caller-digits 3

Router(config-ctrl-cas)# unused-abcd 1

Router(config-ctrl-cas)# metering

Router(config-ctrl-cas)# country argentina use-defaults

Related Command

cas-group (controller E1)

cas-group (controller e1)

To configure R2 signaling on an E1 controller, use the cas-group controller configuration command.

cas-group channel timeslots range type signal
no cas-group channel timeslots range type signal

Syntax Description

channel

Specifies a single channel group number. Replace the channel variable with a number from 0 and 30.

timeslots range

Specifies a timeslot range, which can be from 1 to 31. You can specify a timeslot range (for example, 1-31), individual timeslots separated by commas (for example 1, 3, 5), or a combination of the two (for example, 1-14, 15, 17-31). The 16th time slot is reserved for out-of-band signaling.

type signal

Specifies the type of channel-associated signaling. Configure the signal type that your central office uses. Replace the signal variable with one of the following signal types:

•r2-analog {r2-compelled [ani] | r2-non-compelled [ani] | r2-semi-compelled [ani]}

•r2-digital {r2-compelled [ani] | r2-non-compelled [ani] | r2-semi-compelled [ani]}

•r2-pulse {r2-compelled [ani] | r2-non-compelled [ani] | r2-semi-compelled [ani]}

 

The following descriptions are provided for the previous three R2 syntax bullets:

r2-analog—Specifies R2 ITU Q411 analog line signaling, which reflects the on/off switching of a tone in frequency-division multiplexing circuits (before TDM circuits were created). The tone is used for line signaling.

r2-digital—Specifies R2 ITU Q421 digital line signaling, which is the most common signaling configuration. The A and B bits are used for line signaling.

r2-pulse—Specifies R2 ITU supplement 7 pulse line signaling, which is a transmitted pulse that indicates a change in the line state.

r2-compelled [ani]—Specifies R2 compelled register signaling. You can also specify provisioning the ANI addr option.

r2-non-compelled [ani]—Specifies R2 noncompelled register signaling.

r2-semi-compelled [ani]—Specifies R2 semicompelled register signaling.


Default

No channel-associated signaling is configured on the controller. All R2 signaling types have DNIS turned on by default.

Command Mode

Controller configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 12.0(1)T for the Cisco 3600 Series.

Use this command to configure support for incoming and outgoing call signals (such as on-hook and off-hook) on each E1 controller.

If you specify the timeslot range 1-31, the system software automatically uses the 16th timeslot to transmit the channe-associated signaling.

The signaling you configure on the router must match the signaling used by the central office. For example, if the central office switch is forwarding R2 analog signaling to a Cisco 3640, the router's E1 controller must also be configured for R2 analog signaling (r2-analog).

All R2 signaling options have DNIS support turned on by default. If you enable the ani option, the collection of DNIS information is still performed. Specifying the ani option does not disable DNIS. DNIS is the number being called; ANI is the caller's number. For example, if you are configuring router A to call router B, then the DNIS number is router B, and the ANI number is router A. ANI is very similar to Caller ID.

To customize the R2 signaling parameters, refer to the cas-custom controller configuration command. When you enable the cas-group command, the cas-custom command is automatically set up to be polled for configuration information. However, unless you enable or turn on specific features with the cas-custom command, the cas-custom feature has an empty set of signaling parameters.

Note   Only integrated MICA digital modems support E1 R2 signaling on Cisco series routers.

DNIS is automatically collected for R2 tone signaling. You do not need to specify the collection of DNIS information with the cas-group command.

Examples

In most cases, you will configure the same channel associated signaling on each E1 controller. The following examples configure signaling and customized parameters on controller E1 R2 using the cas-group and cas-custom controller configuration commands.

The actual channel-associated signaling is configured on the 16th timeslot, which is why this timeslot does not come up in the following output. 

Router# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)# controller e1 2

Router(config-controller)# cas-group 1 timeslots 1-31 type r2-digital r2-compelled ani

Router(config-controller)#

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 1 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 2 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 3 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 4 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 5 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 6 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 7 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 8 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 9 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 10 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 11 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 12 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 13 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 14 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 15 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 17 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 18 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 19 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 20 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 21 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 22 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 23 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 24 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 25 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 26 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 27 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 28 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 29 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 30 is up

%DSX0-5-RBSLINEUP: RBS of controller 0 timeslot 31 is up

The following example shows all the supported E1 signaling types on a Cisco 3640. 

Router(config-controller)# cas-group 1 timeslots 1-31 type ?

  r2-analog            R2 ITU Q411

  r2-digital           R2 ITU Q421

  r2-pulse             R2 ITU Supplement 7


Router(config-controller)# cas-group 1 timeslots 1-31 type r2-analog ?

  r2-compelled       R2 Compelled Register signaling

  r2-non-compelled   R2 Non Compelled Register signaling

  r2-semi-compelled  R2 Semi Compelled Register signaling

  <cr>

R2 signaling parameters can be customized with the cas-custom controller configuration command: 

Router(config-controller)# cas-custom 1

Router(config-ctrl-cas)# ?

CAS custom commands:

  ani-digits          Expected number of ANI digits

  answer-signal       Answer signal to be used

  caller-digits       Digits to be collected before requesting CallerID

  category            Category signal

  country             Country Name

  debounce-time       Debounce Timer

  default             Set a command to its defaults

  dnis-digits         Expected number of DNIS digits

  exit                Exit from cas custom mode

  invert-abcd         invert the ABCD bits before tx and after rx

  ka                  KA Signal

  kd                  KD Signal

  metering            R2 network is sending metering signal

  nc-congestion       Non Compelled Congestion signal

  no                  Negate a command or set its defaults

  release-guard-time  Release Guard Timer

  request-category    DNIS Digits to be collected before requesting category

  seizure-ack-time    Seizure to Acknowledge timer

  unused-abcd         Unused ABCD bit values


What to Do Next

For additional software configuration information, see the following publications:

•Dial Solutions Configuration Guide (Cisco IOS Release 12.0)

•Cisco 3600 Series Hardware Installation Guide

•Cisco 3620 Router Installation and Configuration Guide

•Cisco 3640 Router Installation and Configuration Guide

•Cisco AS5200 Universal Access Server Software Configuration Guide

•Update to WAN Interface Cards Hardware Installation Guide

•Cisco 3600 Series Configuration Notes