- Supplementary Services Feature Roadmap
- Overview of Supplementary Services for FXS Ports on Cisco IOS Voice Gateways
- Configuring FXS Ports for Basic Calls
- Enabling Fallback to Cisco Unified SRST for Call Control on Analog (FXS) Ports
- Configuring Supplementary Features
- Configuring Feature Mode
- Configuring CallBack on Busy for Analog Phones
- Configuring CallBack on No Answer
- Configuring Call Waiting Tone Cadence
- Configuring AMWI and VMWI
- Configuring DC Voltage Based VMWI for SCCP Controlled Analog Ports
- Configuring Call Hold/Resume for Shared Lines for Analog Ports
- Configuring cBarge and Privacy for Shared Lines
- Configuring Single Number Reach for Analog Phones
- Media Renegotiation
- Configuring DTMF Relay, Fax Relay and Modem Relay
- Configuring Secure Signaling and Media Encryption for the Cisco VG224
- Configuring Secure SCCP Analog Endpoints over TLS with CM
- Implementing Enhanced Serviceability
- Contents
- Prerequisites for CallBack on Busy for Analog Phones on CiscoVoice Gateways
- Restrictions for CallBack on Busy for Analog Phones on CiscoVoice Gateways
- Information About CallBack on Busy for Analog Phones on CiscoVoice Gateways
- How to Configure CallBack on Busy for Analog Phones on CiscoVoice Gateways
- Configuration Examples for CallBack on Busy for Analog Phones on Cisco Voice Gateways
- Additional References
- Feature Information for CallBack on Busy for Analog Phones on CiscoVoice Gateways
Configuring CallBack on Busy
First Published: August 1, 2008
This module describes the CallBack on Busy feature for analog phones that are connected to Foreign Exchange Station (FXS) ports on a Cisco VG224 Analog Phone Gateway or a Cisco Integrated Services Router (ISR), such as a Cisco 2800 or 3800 series ISR or a Cisco 1861. This feature is supported for analog endpoints that are controlled by Cisco Unified Communications Manager only.
Finding Feature Information in This Module
Your Cisco IOS software release may not support all of the features documented in this module. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the “Feature Information for CallBack on Busy for Analog Phones on Cisco Voice Gateways” section.
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Contents
- Prerequisites for CallBack on Busy for Analog Phones on Cisco Voice Gateways
- Restrictions for CallBack on Busy for Analog Phones on Cisco Voice Gateways
- Information About CallBack on Busy for Analog Phones on Cisco Voice Gateways
- How to Configure CallBack on Busy for Analog Phones on Cisco Voice Gateways
- Additional References
- Feature Information for CallBack on Busy for Analog Phones on Cisco Voice Gateways
Prerequisites for CallBack on Busy for Analog Phones on Cisco Voice Gateways
- Cisco IOS Release 12.4(20)YA or a later version.
- The Cisco voice gateway is set up and configured for operation. For information, see the appropriate Cisco configuration documentation.
- The analog FXS voice ports are set up and configured for operation. For information, see the Cisco IOS Voice Port Configuration Guide.
- SCCP and the SCCP telephony control (STC) application is enabled on the Cisco voice gateway. For configuration information, see the “Configuring FXS Ports for Basic Calls” section.
- SCCP supplementary features are enabled on the Cisco voice gateway. See the “Configuring Supplementary Features” section.
Analog Endpoints in Cisco Unified Communications Manager
- Cisco Unified Communications Manager 6.1.2 or a later version.
- Configure Cisco CallBack service parameters by accessing System> Service Parameters in Cisco Unified Communications Manager Administration; choose the server where the Cisco Unified Communications Manager service runs and then choose the Cisco Unified Communications Manager service. Unless instructed otherwise by the Cisco Technical Assistance Center, we recommend that you use the default service parameters settings. For information, see the “Call Back” section in the appropriate Cisco Unified Communications Manager Features and Services Guide at http://www.cisco.com/en/US/products/sw/voicesw/ps556/prod_maintenance_guides_list.html.
Restrictions for CallBack on Busy for Analog Phones on Cisco Voice Gateways
Information About CallBack on Busy for Analog Phones on Cisco Voice Gateways
To enable SCCP supplementary features on analog phones connected to FXS ports on a Cisco voice gateway, you should understand the following concepts:
Feature Summary
Table 1 contains information about SCCP-based CallBack on Busy for Analog Phones on Cisco Voice Gateways, along with information about how to configure support for this feature in your Cisco call-control system.
Table 1 CallBack on Busy for Analog Phones
CallBack on Busy for Analog Phones on Cisco Voice Gateways
Cisco IOS Release 12.4(20)YA introduces support for CallBack on Busy on analog phones that are connected to FXS ports on Cisco voice gateways and controlled by Cisco Unified Communications Manager 6.1.2 or a later version. In Cisco Unified Communications Manager 6.1.1 and earlier versions, CallBack on Busy is supported only on IP phones.
CallBack on Busy is supported for the following calling and called combinations:
- Calling and called phones are analog phones that are connected to the same voice gateway and are in the same Cisco Unified Communications Manager cluster.
- Calling and called phones are analog phones that are connected to different voice gateways and are in the same Cisco Unified Communications Manager cluster.
- The called phone is any Cisco Unified IP phone that is in the same Cisco Unified Communications Manager cluster as the calling phone.
- The called phone is any phone that is connected to Cisco Unified Communications Manager through a QSIG PRI trunk.
After a phone user initiates a call to a phone that is busy, the caller can activate CallBack on Busy by pressing the callback activation key sequence on the keypad. The callback activation key sequence is a one to five-character string that can be dialed on a telephone keypad (0-9, #, *). The default is #1.
The caller receives a confirmation tone indicating that CallBack on Busy is activated. The calling phone only supports one active callback request at a time. Pressing the callback activation key to activate a second callback request will cancel the first active callback and replace it with the second request. When CallBack on Busy is activated on the calling phone, the phone can be used to make other calls without affecting or canceling CallBack on Busy.
The system monitors the called and calling phones and when both phones are onhook, the calling phone receives a Callback Ringing. If the calling phone does not answer when ringing times out, CallBack on Busy is canceled.
If the caller lifts the handset when the calling phone receives a Callback Ringing, the caller hears a Ring Back Tone and the called phone begins ringing. If the called phone does not answer when ringing times out in Cisco Unified Communications Manager, CallBack on Busy is canceled.
The calling phone is not notified when a CallBack on Busy is canceled.
This feature is disabled by default. To enable this feature and to change default values for callback parameters, see the “How to Configure CallBack on Busy for Analog Phones on Cisco Voice Gateways” section.
How to Configure CallBack on Busy for Analog Phones on Cisco Voice Gateways

Note This document does not contain details about configuring Cisco Unified Communications Manager or Cisco Unified CME. See the documentation for these products for installation and configuration instructions.
To modify the default values of the callback activation key sequence or ringing timer for CallBack on Busy on analog SCCP phones connected to FXS ports, perform the following steps on the Cisco voice gateway.
SUMMARY STEPS
DETAILED STEPS
Configuration Examples for CallBack on Busy for Analog Phones on Cisco Voice Gateways
The following partial output from the show stcapp feature codes command shows the default values for the CallBack on Busy feature:
Router# show stcapp feature codes
The following example shows a configuration for CallBack on Busy on a Cisco voice gateway. In this configuration, the activation key and the timeout period for the ringing timer are modified from the defaults.
Additional References
The following sections provide references related to SCCP analog phone support for FXS ports on the Cisco voice gateway.
Related Documents
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Technical Assistance
Feature Information for CallBack on Busy for Analog Phones on Cisco Voice Gateways
Table 2 lists the features in this module and provides links to specific configuration information. Only features that were introduced or modified in Cisco IOS Release 12.4(20)YA or a later release appear in the table.
For information on a feature in this technology that is not documented here, see the “Supplementary Services Features Roadmap” section.
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 2 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.
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Provides callback notification when a busy called line becomes free. This feature is supported on analog SCCP endpoints in Cisco Unified Communications Manager only. The following sections provide information about this feature:
The following commands were introduced by this feature: stcapp feature callback, activation-key, ringing-timeout. |