User's Manual 204 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
14.5.2 Enabling IP-to-Tel Call Disconnection upon Detection of
Answering Machine
The device can disconnect an IP-to-Tel call upon detection of an answering machine on
the Tel side. Once detected, the device disconnects the call after the receipt of an ISDN
Connect from the Tel side and then sends a SIP BYE message to the IP side to disconnect
the call. You can enable this feature for all calls (globally) using the AMDmode parameter
(see procedure below) or for specific calls using IP Profiles where the IP Profile parameter
'AMD Mode' (IpProfile_AmdMode) is set to [1] Disconnect on AMD (see ''Configuring IP
Profiles'' on page 393).
 To enable disconnection of IP-to-Tel call upon detection of answering machine:
1. Open the Gateway Advanced Settings page (Setup menu > Signaling & Media tab >
Gateway folder > Gateway Advanced Settings).
Figure 14-14: Enabling Disconnection upon Answering Machine Detection
2. From the 'AMD Mode' drop-down list, select Disconnect on AMD, and then click
Apply.
Note: The feature is applicable only to digital interfaces.
14.6 Automatic Gain Control (AGC)
Automatic Gain Control (AGC) adjusts the energy of the output signal to a required level
(volume). This feature compensates for near-far gain differences. AGC estimates the
energy of the incoming signal from the IP or Tel, determined by the 'AGC Redirection'
parameter, calculates the essential gain, and then performs amplification. Feedback
ensures that the output signal is not clipped. You can configure the required Gain Slope in
decibels per second using the 'AGC Slope' parameter and the required signal energy
threshold using the 'AGC Target Energy' parameter.
When the AGC first detects an incoming signal, it begins operating in Fast Mode, which
allows the AGC to adapt quickly when a conversation starts. This means that the Gain
Slope is 8 dB/sec for the first 1.5 seconds. After this period, the Gain Slope is changed to
the user-defined value. You can disable or enable the AGC's Fast Mode feature, using the
ini file parameter AGCDisableFastAdaptation. After Fast Mode is used, the signal should
be off for two minutes in order to have the feature turned on again.
Note: The AGC feature is applicable only to Digital interfaces.
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