E1 R2 Signaling for Voice over IP on the Cisco AS5300 Access Server

Feature Summary

Platforms

Prerequisites

Supported MIBs and RFCs

Configuring E1 R2 Signaling

Configuration Example

Command Reference

What to Do Next

• Argentina

• Australia

• Brazil

• China

• Colombia

• 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

• Mexico (Telmex corporation)

• Mexico (Telnor corporation)

• New Zealand

• Paraguay

• Peru

• Philippines

• Saudi Arabia

• Singapore

• South Africa (Panaftel variant )

• Thailand

• Uruguay

• Venezuela

• Vietnam

Of these, the following local variants have been verified:

• Argentina

• Brazil

• China

• Mexico (Telmax)

• Singapore

• Thailand

• Establish a working IP network. For more information about configuring IP, refer to the "IP  Overview," "Configuring IP Addressing," and "Configuring IP Services" chapters in the Cisco IOS 11.3 Network Protocols Configuration Guide, Part 1.

• Complete basic configuration for the Cisco AS5300. This includes, as a minimum, the following tasks:

  • Configure a host name and password for the Cisco AS5300

  • Configure the Ethernet 10BaseT/100BaseT interface of your Cisco AS5300 so that it can be recognized as a device on the Ethernet LAN

  • Configure the Cisco AS5300 E1 controller.

For more information about any of the these configuration tasks, refer to the Cisco AS5300 Universal Access Server Software Configuration Guide.

• Install the VFC into the appropriate slot of your Cisco AS5300 access server. Each VFC can hold up to 5 digital signal processor modules (DSPMs), enabling processing for up to 30 B  channels. For more information about the physical characteristics of the VFCs or DSPMs, or how to install them, refer to Installing Voice over IP Feature Cards in Cisco AS5300 Universal Access Servers, which came with your VFC.

• Configure Voice over IP on the Cisco AS5300. This includes the following tasks:

  • Integrate your dial plan and telephony network into your existing IP network topology.

  • Configure the Quality of Service (QoS) parameters to support real-time voice traffic. These QoS parameters include RSVP for voice, Multilink PPP with interleaving, RTP header compression, custom queuing, and weighted fair queuing.

  • Configure Frame Relay for Voice over IP, if needed for your network topology.

  • Configure voice port, number expansion, and VoIP and POTS dial-peer configuration parameters. Depending on the topology of your network, you might also need to configure IP precedence, RSVP, CODEC, and VAD parameters for the dial peers you define.

For more information about configuring Voice over IP for the Cisco AS5300, refer to the Voice over IP for the Cisco AS5300 Software Configuration Guide.

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, refer to the cas-group (controller e1) command in the Cisco IOS Release 12.0 Dial Solutions Command Reference.
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	Specify 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 in the Cisco IOS Release 12.0 Dial Solutions Command Reference 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 in the Cisco IOS Release 12.0 Dial Solutions Command Reference for more information about each signaling command.
6 .	exit	Exit interface configuration mode.
7 .	voice-port controller-number:channel-number	Enter voice port configuration mode for the specified voice port.
8 .	cptone country-code	Define the cptone code to set up the country-specific PCM encoding and tones. The PCM encoding type must match the country code defined by the cas-custom command.
9 .	exit	Exit voice-port configuration mode.
10 .	exit	Exit global configuration mode.

As mentioned in the previous configuration steps, the E1 R2 signaling type (whether ITU, ITU variant, or local variant as defined by the cas-custom command) needs to match the appropriate PCM encoding type as defined by the cptone command. For countries for which a cptone value has not yet been defined, you can try the following:

• If the country uses aLaw E1 R2 signaling, use the GB value for the cptone command.

• If the country uses uLaw E1 R2 signaling, use the US value for the cptone command.

For more information about configuring R2 signaling, refer to the Cisco IOS Release 12.0 Dial  Solutions Configuration Guide.

• 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

• To check the robbed-bit signaling status of each channel, enter the debug serial interface command and the show controller e1 command.

as5300#debug serial inter 
 Serial network interface debugging is on
 
as5300#sh cont 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:0
 
Manufacture Cookie Info:
 EEPROM Type 0x0001, EEPROM Version 0x01, Board ID 0x43,
 Board Hardware Version 1.0, Item Number 73-2218-4,
 Board Revision A0, Serial Number 07805788,
 PLD/ISP Version 0.0, Manufacture Date 19-Feb-1998.
 
  Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line Primary.
  Data in current interval (135 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
 Robbed bit signals state:
        timeslots       rxA rxB rxC rxD         txA txB txC txD
 
        1               0   0   0   1           0   1   0   1
        2               0   0   0   1           0   1   0   1
        3               0   0   0   1           0   1   0   1
        4               1   0   0   1           1   0   0   1
        5               1   0   0   1           1   0   0   1
        6               0   0   0   1           0   1   0   1
        7               1   0   0   1           1   0   0   1
        8               1   0   0   1           1   0   0   1
        9               1   0   0   1           1   0   0   1
        10              1   0   0   1           1   0   0   1
        11              0   0   0   1           0   1   0   1
        12              0   0   0   0           0   0   0   0
        13              1   0   0   1           1   0   0   1
        14              1   0   0   1           1   0   0   1
        15              1   0   0   1           1   0   0   1
        17              0   0   0   1           0   1   0   1
        18              1   0   0   1           1   0   0   1
        19              1   0   0   1           1   0   0   1
        20              0   0   0   1           0   1   0   1
        21              1   0   0   1           1   0   0   1
        22              1   0   0   1           1   0   0   1
        23              1   0   0   1           1   0   0   1
        24              0   0   0   1           0   1   0   1
        25              0   0   0   1           0   1   0   1
        26              0   0   0   1           0   1   0   1
        27              0   0   0   1           0   1   0   1
        28              0   0   0   0           0   0   0   0
        29              0   1   1   0           0   1   0   1
        30              0   1   0   1           0   0   0   1
        31              0   0   0   0           1   0   0   0

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

• Backward transmit and receive

• Mismatched framing types (for example, CRC-4 versus 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 for the following:

• Mismatched line codes (HDB3 versus AMI)

• Receive level

• Frame slips due to poor clocking plan

! Specify the E1 controller that you want to configure with R2 signaling. 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.
! Configure channel associated signaling. The signaling type forwarded by the
! connecting telco switch must match the signaling configured on the Cisco AS5300.
! The country code is ITU by default.
!
controller E1 0
 framing NO-CRC4
 cas-group 0 timeslots 1-15,17-31 type r2-digital r2-compelled ani
 cas-custom 0
!
controller E1 1
 framing NO-CRC4
 clock source line primary
 cas-group 0 timeslots 1-15,17-31 type r2-digital r2-compelled
!
! Customize some of the E1 R2 signaling parameters with the cas-custom channel
! controller configuration command. This example specifies the default R2 settings for
! Brazil.
!
 cas-custom 0
  country brazil use-defaults
  metering
  category 2
  answer-signal group-b 1
!
controller E1 2
!
controller E1 3
!
! Configure voice port parameters. Be sure that the cptone command value is compatable
! with the country code defined by the cas-custom command. In this example, because
! ITU has no specific cptone value defined and uses aLaw E1 R2 signaling, the GB
! cptone command value is used.
!
voice-port 0:0
 cptone GB
!
voice-port 1:0
 cptone BR
 description Brasil Tone
!
! Define the parameters associated with the VoIP dial peer.
!
dial-peer voice 101 voip
 destination-pattern +500..
 session target ipv4:172.14.25.1
!
! Define the parameters associated POTS dial peer.
!
dial-peer voice 8221 pots
 destination-pattern 011822...
 direct-inward-dial
 port 0:0
!
! Configure LAN interfaces.
!
interface Ethernet0
 ip address 172.13.103.33 255.255.0.0
 no ip directed-broadcast
 no ip mroute-cache
 load-interval 30
 no cdp enable
!
interface FastEthernet0
 ip address 173.14.25.100 255.255.0.0
 no ip directed-broadcast
 bandwidth 1000000
 load-interval 30
 duplex full
 hold-queue 75 in
!
no ip classless
ip route 223.255.254.253 255.255.255.255 Ethernet0
!
!
line con 0
 exec-timeout 0 0
 logging synchronous level all
 transport input none
 escape-character BREAK
line aux 0
 rotary 1
 transport preferred none
 transport input all
 flowcontrol hardware
line vty 0 4
 exec-timeout 60 0
 password lab
 login
!
end

---

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

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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 option 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 versus voice calls. This information 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.

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)# 
 

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