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Silence Suppression/Voice
Activity Detection (VAD)
Bandwidth is used only when someone is speaking. During silent periods of a phone call, bandwidth is available for
data traffic.
Comfort Noise Generation To better simulate phone calls over voice networks, this feature reassures the phone user that the connection is being
maintained, even when no voice packets are being transmitted.
Dial Plan Mapping Automatic mapping of dialed phone numbers to IP addresses simplifies configuration and management.
Dual Tone Multifrequency
(DTMF) Tone Processing
This feature enables access to voice-mail and Interactive Voice Response (IVR) systems.
T.30 Protocol Recognition This feature enables real-time fax capability.
Country-Specific Signaling This feature transparently delivers customary phone signals to users, facilitating acceptance of new technology.
Autocalling With this feature, a destination phone can be configured to automatically ring when the handset is lifted (also known
as Private Line Automatic Ring-down—PLAR).
Hunt Groups Calls can be forwarded automatically to the first available line.
Battery Polarity Reversal
Detection and Initiation
Detection of disconnect supervision and far-end answer supervision via battery polarity reversal provides a robust
method of providing supervisory disconnect especially for loop start signaling on FXS and FXO interfaces (12.1(2)T
and later Cisco IOS Plus images support battery polarity reversal on the VIC-2FXS, VIC-2FXO-M1 and
VIC-2FXO-M2 VICs).
Supervisory Disconnect Signalling protocols such as loop-start do not provide means for quickly detecting when the call initiation is
terminated prior to call connection. Supervisory disconnect quickly makes this determination and frees valuable
resources for other calls.
ISDN BRI Network Side and
Phantom Power
Cisco IOS software releases 12.1.5T provide the ability to connect PBX configured as user side directly to the router.
Phantom power is also provided to accommodate equipment that requires it.
CAMA trunk connection Cisco IOS software release 12.2(11)T provides the ability to connect to analog CAMA trunk wich allows E-911
services.
Feature Benefit