E1 R2 Signaling for the Cisco AS5300 and Cisco AS5200 Access Servers

Command Reference

cas-custom

cas-group (controller e1)

E1 R2 Signaling for the Cisco AS5300 and Cisco AS5200 Access Servers

The following sections are provided:

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
Brazil
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
Korea
Malaysia
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 modems support R2 functionality. Microcom modems do not support R2.

Benefits

R2 custom localization---R2 signalling is supported for a wide range of countries and geographical regions. Cisco is continually supporting new countries.
Broader deployment of dial access services---The flexibility of a high-density access server can be deployed in E1 networks.

Platforms

These access servers support this feature:

Cisco AS5300
Cisco AS5200

Supported MIBs and RFCs

None.

Sample Network Topology

Figure 1 shows a sample network topology for using E1 R2 signaling with a Cisco AS5300. All four controllers on the access server are configured with R2 digital signaling. Additionally, localized R2 country settings are enabled on the access server. For a sample configuration, see the "Configuration Example" section.

Figure 1: Service Provider using E1 R2 Signaling and a Cisco AS5300

Configuring E1 R2 Signaling

R2 signalling is channelized E1 signalling 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 issuing 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, the ANI number is assigned to router A. ANI is similar to Caller ID.

Configure

To configure E1 R2 signaling, use the following commands beginning in global configuration mode:

Step Command Purpose

1 .

controller e1 number

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

2 .

cas-group channel timeslots range type {r2-analog | r2-digital | r2-pulse} [dtmf | 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) command reference page.

3 .

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.

4 .

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 the cas-custom command reference page for the list of supported countries, regions, and corporation specifications.

5 .

ani-digits

answer-signal

caller-digits

category

default

dnis-digits

invert-abcd

ka

kd

metering

nc-congestion

unused-abcd

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 the section "Configuration Example".

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 number 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.

5300# show controller e1 0
E1 0 is up.
  Applique type is Channelized E1 - balanced
  No alarms detected.
  Version info of Slot 0:  HW: 2, Firmware: 4, PLD Rev: 2
 
Manufacture Cookie is not programmed.
 
  Framing is CRC4, Line Code is HDB3, Clock Source is Line Primary.
  Data in current interval (785 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 13 15 minute intervals):
     0 Line Code Violations, 0 Path Code Violations,
     0 Slip Secs, 12 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 12 Unavail Secs

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

5300# show modem csm 1/0
MODEM_INFO: slot 1, port 0, unit 0, tone r2-compelled, modem_mask=0x0000, modem_port_offset=0
tty_hwidb=0x60E63E4C, modem_tty=0x60C16F04, oobp_info=0x00000000, modem_pool=0x60BC60CC
modem_status(0x0002): VDEV_STATUS_ACTIVE_CALL.
csm_state(0x0205)=CSM_IC5_CONNECTED, csm_event_proc=0x600CFF70, current call thru CAS line
invalid_event_count=0, wdt_timeout_count=0
wdt_timestamp_started is not activated
wait_for_dialing:False, wait_for_bchan:False
pri_chnl=TDM_PRI_STREAM(s0, u3, c7), modem_chnl=TDM_MODEM_STREAM(s1, c0)
dchan_idb_start_index=0, dchan_idb_index=0, call_id=0x0239, bchan_num=6
csm_event=CSM_EVENT_DSX0_CONNECTED, cause=0x0000
ring_no_answer=0, ic_failure=0, ic_complete=3
dial_failure=0, oc_failure=0, oc_complete=0
oc_busy=0, oc_no_dial_tone=0, oc_dial_timeout=0
remote_link_disc=2, stat_busyout=2, stat_modem_reset=0
oobp_failure=0
call_duration_started=00:04:56, call_duration_ended=00:00:00, total_call_duration=00:01:43
The calling party phone number = 
The called party phone number  = 9993003
total_free_rbs_timeslot = 0, total_busy_rbs_timeslot = 0, total_dynamic_busy_rbs_timeslot = 0, total_static_busy_rbs_timeslot = 0, min_free_modem_threshold = 0

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:

5300# debug modem csm 1/0
*May 15 04:05:46.675: VDEV_ALLOCATE: slot 2 and port 39 is allocated.
 
*May 15 04:05:46.675: CSM_RX_CAS_EVENT_FROM_NEAT:(04BF):  EVENT_CALL_DIAL_IN at slot 2 and port 39
 
*May 15 04:05:46.675: CSM_PROC_IDLE: CSM_EVENT_DSX0_CALL at slot 2, port 39
 
*May 15 04:05:46.675: Mica Modem(2/39): Configure(0x0) 
*May 15 04:05:46.675: Mica Modem(2/39): Configure(0x3) 
*May 15 04:05:46.675: Mica Modem(2/39): Configure(0x6) 
*May 15 04:05:46.675: Mica Modem(2/39): Call Setup
*May 15 04:05:46.891: Mica Modem(2/39): State Transition to Call Setup
*May 15 04:05:46.891: Mica Modem(2/39): Went offhook
*May 15 04:05:46.891: CSM_PROC_IC1_RING: CSM_EVENT_MODEM_OFFHOOK at slot 2, port 39
.
.
.

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 2 of a Cisco AS5300. 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:

as5300# 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 number global configuration command. A controller informs the access server how to distribute or provision individual timeslots for a connected channelized E1 line. You must configure one E1 controller for each E1 line.

as5300(config)# controller e1 2

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 AS5300. The Cisco IOS configuration options are r2-analog, r2-digital, or r2-pulse.

as5300(config-controller)# cas-group 1 timeslots 1-31 type ?
  e&m-fgb              E & M Type II FGB
  e&m-fgd              E & M Type II FGD
  e&m-immediate-start  E & M Immediate Start
  fxs-ground-start     FXS Ground Start
  fxs-loop-start       FXS Loop Start
  p7                   P7 Switch
  r2-analog            R2 ITU Q411
  r2-digital           R2 ITU Q421
  r2-pulse             R2 ITU Supplement 7
  sas-ground-start     SAS Ground Start
  sas-loop-start       SAS Loop Start

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

as5300(config-controller)# cas-group 1 timeslots 1-31 type r2-digital r2-compelled ani
as5300(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)

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.

as5300(config-controller)# cas-custom 1
as5300(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

as5300(config-ctrl-cas)# country ?
argentina             Argentina
  australia             Australia
  brazil                Brazil
  china                 China
  columbia              Columbia
.
.
.
as5300(config-ctrl-cas)# country argentina ?
  use-defaults   Use Country defaults
  <cr>
 
as5300(config-ctrl-cas)# country argentina use-defaults

Note

country ?

Command Reference

This section documents new and modified commands. All other commands used with this feature are documented in the Cisco IOS Release 11.3 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 between 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 Table 1, ITU is the selected default signal.

Command Mode

Controller configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.2 P.

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 two 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 Table 1. This additional keyword ensures that all the local country settings are correctly enabled. For example, issue 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 Table 1: 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, issue the country name use-defaults command. To return a country back to the ITU standard, issue the default country name use-defaults command. See Example 3 and Example 4.

Note Only integrated MICA modems support E1 R2 signaling on Cisco access servers.

Table 1 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

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 between 0 and 64. The maximum number of collected digits is set by max number. Replace the number variable with a value between 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 1 to 15. Default is group-b 6, which is the ITU default.

caller-digits number

Specifies the number of digits the access server needs to collect before it requests ANI or CallerID information. The digits can be from 1 to 10. 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. 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. Default country setting is ITU.

argentina use-defaults

australia use-defaults

brazil 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

malaysia 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.

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 between 0 and 64. The maximum number of collected digits is set by max number. Replace the number variable with a value between 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. You can choose 1 to 15. Default is 0, which is the ITU default.

kd number

Specifies the KD signal code. You can choose 1 to 15. Default is 0, which is the ITU default.

metering

Specifies sending a metering pulse when the access server is making an outgoing call. 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 access server is congested and cannot accept the call. The default is B4, which is the ITU default.

no

Negates a command or sets its defaults.

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.

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.

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 between 0 and 64. The maximum number of collected digits is set by max number. Replace the number variable with a value between 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 1 to 15. Default is group-b 6, which is the ITU default.
caller-digits number	Specifies the number of digits the access server needs to collect before it requests ANI or CallerID information. The digits can be from 1 to 10. 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. 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. Default country setting is ITU. argentina use-defaults australia use-defaults brazil 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 malaysia 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.
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 between 0 and 64. The maximum number of collected digits is set by max number. Replace the number variable with a value between 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. You can choose 1 to 15. Default is 0, which is the ITU default.
kd number	Specifies the KD signal code. You can choose 1 to 15. Default is 0, which is the ITU default.
metering	Specifies sending a metering pulse when the access server is making an outgoing call. 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 access server is congested and cannot accept the call. The default is B4, which is the ITU default.
no	Negates a command or sets its defaults.
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.
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
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
  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

Example 2

You can localize your R2 configuration for a specific country. Don't forget to include the use-defaults option as described in Table 1. For example, use the country argentina use-defaults command for a R2 scenario in Argentina.

router(config-ctrl-cas)# country ?
argentina             Argentina
  australia             Australia
  brazil                Brazil
  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
  korea                 Korea
  malaysia              Malaysia
  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 AS5300 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-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, 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 channel associated signaling on an E1 controller, use the cas-group controller configuration command. Use the no form of this command to disable channel associated signaling for one or more timeslots.

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 between 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: · e&m-fgb [dtmf [dnis] \| mf [dnis]]---Specifies ear and mouth channel signaling with feature group B support, which includes the wink start protocol. The optional signal tones are DTMF and MF with the option of provisioning DNIS. · e&m-fgd---Specifies ear and mouth channel signaling with feature group D support, which includes the wink start protocol. · e&m-immediate-start---Specifies ear and mouth channel signaling with immediate start support. · fxs-ground-start---Specifies Foreign Exchange Station ground start signaling support. · fxs-loop-start--- Specifies Foreign Exchange Station loopstart signaling support. · p7--- Specifies the P7 switch type. · sas-ground-start---Specifies Special Access Station ground start signaling support. · sas-loop-start---Specifies Special Access Station loopstart signaling support.
	· r2-analog [dtmf \| r2-compelled [ani] \| r2-non-compelled [ani] \| r2-semi-compelled [ani]] · r2-digital [dtmf \| r2-compelled [ani] \| r2-non-compelled [ani] \| r2-semi-compelled [ani]] · r2-pulse [dtmf \| 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. dtmf---Specifies the DTMF tone signaling. 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 11.2 P.

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 channel associated signaling.

The signaling you configure on the access server must match the signaling used by the central office. For example if the central office switch is forwarding R2 analog signaling to a Cisco AS5300, then the access server'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, 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 setup 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 modems support E1 R2 signaling on Cisco access servers.

DNIS is automatically collected for modem pools and R2 tone signaling. You do not need to specify the collection of DNIS information with the cas-group command. However, if you are using non-R2 tone signaling, the system must be manually configured to collect DNIS information. For non-R2 cas signaling, DNIS collection is done only for E&M-fgb.

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 2 using the cas-group and cas-custom controller configuration commands.

The actual channel associated signaling is configured on the 16th timeslot, which is the reason 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 AS5300.

router(config-controller)# cas-group 1 timeslots 1-31 type ?
  e&m-fgb              E & M Type II FGB
  e&m-fgd              E & M Type II FGD
  e&m-immediate-start  E & M Immediate Start
  fxs-ground-start     FXS Ground Start
  fxs-loop-start       FXS Loop Start
  p7                   P7 Switch
  r2-analog            R2 ITU Q411
  r2-digital           R2 ITU Q421
  r2-pulse             R2 ITU Supplement 7
  sas-ground-start     SAS Ground Start
  sas-loop-start       SAS Loop Start
 
router(config-controller)# cas-group 1 timeslots 1-31 type r2-analog ?
  dtmf               DTMF tone signalling
  r2-compelled       R2 Compelled Register Signalling
  r2-non-compelled   R2 Non Compelled Register Signalling
  r2-semi-compelled  R2 Semi Compelled Register Signalling
  <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:
  caller-digits  Digits to be collected before requesting CallerID
  category       Category signal
  country        Country Name
  default        Set a command to its defaults
exit           Exit from cas custom mode
  invert-abcd    invert the ABCD bits before tx and after rx
  metering       R2 network is sending metering signal
  nc-congestion  Non Compelled Congestion signal
  no             Negate a command or set its defaults

What to Do Next

For additional software configuration information, see the following publications:

Dial Solutions Configuration Guide (Cisco IOS Release 11.3)
Cisco AS5300 Universal Access Server Software Configuration Guide
Cisco AS5200 Universal Access Server Software Configuration Guide

Table of Contents