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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Configuring Next-Generation High-Density PVDM3 Modules
Information About Configuring the PVDM3 Module on Cisco Voice Gateway Routers
Broadcast Fast Busy Tone for DSP Oversubscription
There should always be a dial tone when a telephone is lifted. However, when DSP oversubscription
occurs, and a caller goes off-hook, dead-air is received. With this feature, the caller receives a fast-busy
tone instead of silence. This feature is not supported on application-controlled endpoints, Foreign
Exchange Office (FXO) signaling endpoints, and BRI and Primary Rate Interface (PRI) endpoints.
The following lists the maximum number of different fast busy tone (specific to country) that can be
supported by each PVDM type:
• PVDM3-16 1
• PVDM3-32 1
• PVDM3-64 2
• PVDM3-128 3
• PVDM3-192 3
• PVDM3-256 3
Prior to Cisco IOS Release 15.0(1)M, a new call attempt failed and dead silence occurred when DSPs
were oversubscribed. When the PVDM3 is installed, a fast busy tone is broadcast to session application
endpoints when DSP oversubscription occurs for both analog ports and digital ports, except PRI and
BRI. FXO signaling and application controlled endpoints are not supported. This feature does not apply
to insufficient DSP credits due to mid-call codec changes (while a call is already established).
Online Insertion and Removal
Cisco 3900 Series ISRs support only managed online insertion and removal. All voice ports and
controllers should be shut down. Transcoding, conferencing, and MTP DSPfarm profiles need to be shut
down in addition to the controller and voice port shutdown. Also, remove the DSP sharing (that is,
DS0-group and DSPfarm sharing).
If the power efficiency management is configured on the module, the EnergyWise level must be set to
10 or online insertion and removal is not allowed.
Perform the following tasks for managed online insertion and removal on the Cisco 3900 Series ISRs:
1. Shut down the controller and voice ports.
2. Perform online insertion and removal.
3. Restart the controller and voice ports.
Shut down the controller and voice ports
Perform the steps detailed in this section to shut down the controller and voice ports
SUMMARY STEPS
1. enable
2. configure terminal
3. controller e1 slot/port
4. shutdown
5. exit
6. voice-port slot number/port
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