AudioCodes Mediant 800 - RFC 2833 ANS Report Upon Fax;Modem Detection

CHAPTER15 Media
Mediant 800 Gateway & E-SBC | User's Manual
➢ To configure fax / modem transparent mode:
1. Open the Gateway General Settings page (Setup menu > Signaling & Media tab > Gateway
folder > Gateway General Settings), and then from the 'Fax Signaling Method' drop-down list
(IsFaxUsed), select No Fax.
2. On the Fax/Modem/CID Settings page, do the following:
● Set the 'Fax Transport Mode' parameter to Disable (FaxTransportMode = 0).
● Set the 'V.21 Modem Transport Type' parameter to Disable (V21ModemTransportType =
0).
● Set the 'V.22 Modem Transport Type' parameter to Disable (V22ModemTransportType =
0).
● Set the 'V.23 Modem Transport Type' parameter to Disable (V23ModemTransportType =
0).
● Set the 'V.32 Modem Transport Type' parameter to Disable (V32ModemTransportType =
0).
● Set the 'V.34 Modem Transport Type' parameter to Disable (V34ModemTransportType =
0).
3. Configure the [BellModemTransportType] parameter to [0] (transparent mode).
4. Configure the following optional parameters:
● Coders in the Coders table - see Configuring Coder Groups.
● 'Dynamic Jitter Buffer Optimization Factor' (DJBufOptFactor) - Configuring the Dynamic
Jitter Buffer.
● 'Echo Canceller' (EnableEchoCanceller) - see Configuring Echo Cancellation.
This mode can be used for fax, but is not recommended for modem transmission.
Instead, use the Bypass (see Fax/Modem Bypass Mode) or Transparent with Events
modes (see Fax / Modem Transparent with Events Mode) for modem.
RFC 2833 ANS Report upon Fax/Modem Detection
The device (terminator gateway) sends RFC 2833 ANS/ANSam events upon detection of fax
and/or modem answer tones (i.e., CED tone). This causes the originator to switch to fax/modem.
The parameter is applicable only when the fax or modem transport type is set to bypass,
Transparent-with-Events, V.152 VBD, or G.711 transport. When the device is located on the
originator side, it ignores these RFC 2833 events.
➢ To configure RFC 2833 ANS Report upon fax/modem detection:
1. Open the Gateway General Settings page (Setup menu > Signaling & Media tab > Gateway
folder > Gateway General Settings), and then from the 'Fax Signaling Method' drop-down list
(IsFaxUsed), select No Fax or Fax Fallback.
2. On the Fax/Modem/CID Settings page, do the following:
● Set the 'Fax Transport Mode' parameter to Bypass (FaxTransportMode = 2).
● Set the 'V.xx Modem Transport Type' parameters to Enable Bypass
(VxxModemTransportType = 2).
3. Configure the [FaxModemNTEMode] parameter to [1] (enables this feature).
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