Version 7.2 193 Mediant 800B Gateway & E-SBC
User's Manual 14. Media
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 206.
• For a detailed description of the parameters appearing on this page, see
'Configuration Parameters Reference' on page 1055.
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
206): 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
any of the transport capabilities), fallback to existing logic occurs (according to the
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