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.
Feature History for Expanded Scope for Cause-Code-Initiated Call Establishment Retries
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see
Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
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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.
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. 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.
General information about ISDN voice interfaces is presented in the "Information About ISDN Voice Interfaces" section.
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.
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
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
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
isdn negotiate-bchan resend-setup cause-codes 34 44 63
General ISDN References
"Overview of ISDN Voice Interfaces" --Describes relevant underlying technology; lists related documents, standards, MIBs, and RFCs; and describes how to obtain technical assistance