Fax And Modem Capabilities; Fax/Modem Operating Modes - AudioCodes Mediant 500L User Manual


To configure echo cancellation:
1. Configure line echo cancellation:
a. Open the Voice Settings page (Setup menu > Signaling & Media tab > Media
folder > Voice Settings).
b. From the 'Echo Canceller' drop-down list (EnableEchoCanceller), select Enable.
Note: The following additional echo cancellation parameters are configurable only
through the ini file:
•
ECHybridLoss - defines the four-wire to two-wire worst-case Hybrid loss
•
ECNLPMode - defines the echo cancellation Non-Linear Processing (NLP) mode
•
EchoCancellerAggressiveNLP - enables Aggressive NLP at the first 0.5 second of
the call
14.2

Fax and Modem Capabilities

This section describes the device's fax and modem capabilities and corresponding
configuration. The fax and modem configuration is done in the Fax/Modem/CID Settings
page.
Note:
•
Unless otherwise specified, the configuration parameters mentioned in this section
are available on this page.
•
Some SIP parameters override these fax and modem parameters. For example,
the IsFaxUsed parameter and V.152 parameters in Section ''V.152 Support'' on
page 199.
•
For a detailed description of the parameters appearing on this page, see
''Configuration Parameters Reference'' on page 1003.

To access the fax and modem parameters:
1. Open the Fax/Modem/CID Settings page (Setup menu > Signaling & Media tab >
Media folder > Fax/Modem/CID Settings).
2. Configure the parameters, as required.
3. Click Apply.

14.2.1 Fax/Modem Operating Modes

The device supports two modes of operation:

Fax/modem negotiation that is not performed during the establishment of the call.

Voice-band data (VBD) mode for V.152 implementation (see ''V.152 Support'' on page
199): fax/modem capabilities are negotiated between the device and the remote
endpoint at the establishment of the call. During a call, when a fax/modem signal is
detected, transition from voice to VBD (or T.38) is automatically performed and no
additional SIP signaling is required. If negotiation fails (i.e., no match is achieved for
User's Manual
Figure 14-2: Enabling Echo Cancellation
186
Mediant 500L Gateway & E-SBC
Document #: LTRT-10532