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Expanded Scope for Cause-Code-Initiated Call-Establishment Retries
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Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

Table Of Contents

Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

Contents

Prerequisites for Expanded Scope for Cause-Code-Initiated Call Establishment Retries

Restrictions for Expanded Scope for Cause-Code-Initiated Call Establishment Retries

Information About Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

How to Configure Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

Configuring Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

Verifying Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

Troubleshooting Tips

Configuration Examples for Expanded Scope for Cause-Code-Initiated Call Establishment Retries

ISDN Interface: Example

Cause Codes: Example

Additional References


Expanded Scope for Cause-Code-Initiated Call-Establishment Retries


This chapter describes how to implement the Expanded Scope for Cause-Code-Initiated Call Establishment Retries feature. This feature enables a gateway to reattempt calls when a disconnect message is received from the PSTN without maintaining extra dial peers.

Release
Modification

12.2(15)T

This feature was introduced.


Feature History for Expanded Scope for Cause-Code-Initiated Call Establishment Retries

Finding Support Information for Platforms and Cisco IOS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.


Note For more information about related Cisco IOS voice features, see the following:

"Overview of ISDN Voice Interfaces" on page 3

Entire Cisco IOS Voice Configuration Library—including library preface and glossary, other feature documents, and troubleshooting documentation—at http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/cisco_ios_voice_configuration_library_glossary/vcl.htm

For a list of references cited in this chapter, see the "Additional References" section.


Contents

Prerequisites for Expanded Scope for Cause-Code-Initiated Call Establishment Retries

Restrictions for Expanded Scope for Cause-Code-Initiated Call Establishment Retries

Information About Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

How to Configure Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

Configuration Examples for Expanded Scope for Cause-Code-Initiated Call Establishment Retries

Additional References

Prerequisites for Expanded Scope for Cause-Code-Initiated Call Establishment Retries

Perform the prerequisites that are listed in the "Prerequisites for Configuring ISDN Voice Interfaces" section on page 3.

Configure ISDN (trunks) or the Cisco Signaling System 7 (SS7) on the gateway.

Restrictions for Expanded Scope for Cause-Code-Initiated Call Establishment Retries

Restrictions are described in the "Restrictions for Configuring ISDN Voice Interfaces" section on page 4. In addition, the following applies:

This feature must be used with ISDN Net5 PRI or NI2 PRI switch types.

Information About Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

Before this feature was available, there was no easy way to reattempt most calls when a disconnect was received from the PSTN. Only cause code 44 reattempted a call—and only if multiple dial peers to the same destination were configured.


Note General information about ISDN voice interfaces is presented in the "Information About ISDN Voice Interfaces" section on page 4.


This feature enables you to configure a gateway to reattempt a call when a disconnect message is received from the PSTN. You can configure up to 16 arguments (specifying values from 1 to 127 in each argument) for cause codes.


Note For a list of cause codes, see ISDN Switch Types, Codes, and Values.


How to Configure Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

Configuring Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

Verifying Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

Troubleshooting Tips

Configuring Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

To configure expanded scope for cause-code-initiated call-establishment retries, perform the following steps.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type slot/port

4. isdn negotiate-bchan

5. exit

DETAILED STEPS
 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enters privileged EXEC mode. Enter your password when prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

interface type slot/port

Example:

Router(config)# interface serial 0/4

Configures an interface type and enters interface configuration mode for the specified slot/port.

Step 4 

isdn negotiate-bchan [resend-setup] [cause-codes {cause-code1 [cause-code2...cause-code16]}]

Example:

Router(interface)# isdn negotiate-bchan resend-setup cause-codes 34 44 63

Enables the router to accept a B channel that is different from the B channel requested in the outgoing call-setup message and specifies the cause codes for which the call is reattempted.

Note You must have ISDN trunks configured on your router before you can configure the cause codes.

Step 5 

exit

Example:

Router(interface)# exit

Exits the current mode.

Verifying Expanded Scope for Cause-Code-Initiated Call-Establishment Retries

To verify expanded scope for cause-code-initiated call-establishment retries, perform the following steps (listed alphabetically).

SUMMARY STEPS

1. show isdn status

2. show running-config

DETAILED STEPS


Step 1 show isdn status

Use this command to display the status of all ISDN interfaces, including active layers, timer information, and switch-type settings.

Step 2 show running-config

Use this command to display basic router configuration, including cause codes and values entered to verify that the gateway can reattempt disconnect calls received form the PSTN.


Troubleshooting Tips

Use the debug isdn q931 command to display calls that the router has attempted or reattempted.

Configuration Examples for Expanded Scope for Cause-Code-Initiated Call Establishment Retries

ISDN Interface: Example

Cause Codes: Example

ISDN Interface: Example

The following output shows that the ISDN interface is configured on the gateway and that the gateway is configured to reattempt disconnect calls received from the PSTN when the disconnect cause code is 18.

Router# show running-config
!
interface Serial7/0:0
 no ip address
 isdn switch-type primary-ni
 isdn incoming-voice modem
 isdn T306 30000
 isdn rlm-group 0
 no isdn send-status-inquiry
 isdn negotiate-bchan resend-setup cause-code 18 ==> Cause-code 18 is configured.
 no cdp enable
!
end

Cause Codes: Example

The following sample configuration shows that cause codes 34, 44, and 63 are set on serial slot 0 and port 23:

Router# show running-config
!
interface serial0:23
 isdn negotiate-bchan resend-setup cause-codes 34 44 63
end

Additional References

General ISDN References

"ISDN Features Roadmap" on page 1—Describes how to access Cisco Feature Navigator; also lists and describes, by Cisco IOS release, ISDN features for that release

"Overview of ISDN Voice Interfaces" on page 3—Describes relevant underlying technology; lists related documents, standards, MIBs, and RFCs; and describes how to obtain technical assistance

"Additional References" section on page 64—Lists additional ISDN references

References Mentioned in This Chapter

ISDN Switch Types, Codes, and Values at http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123sup/123debug/dbg_ap2g.htm


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