Cisco Cisco IOS Software Release 12.4(9)T

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The Customizable PSTN Tones and H.323 Call-Disconnect Cause Codes featurette enables you to 
customize PSTN tones and H.323 call-disconnect cause codes for certain disconnect scenarios. 
Specifically, you can customize the following:

PSTN tones that are applicable to foreign-exchange-station (FXS), PRI, and BRI calls and IP phones

Q.850 call-disconnect cause codes for H.323 gateways

In addition, you can specify the mechanism for detecting media inactivity (silence) on a voice call in any 
of the following ways:

Absence of Real-Time Transport Protocol (RTP) packets sent or received

Absence of RTP Control Protocol (RTCP) packets sent or received

Absence of both types of packets sent or received

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 

.

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 

. An 

account on Cisco.com is not required.