AudioCodes MediaPack 114 Manual do Utilizador descarregar pdf (Página 325)

Version 5.6 325 November 2008

SIP User's Manual 7. IP Telephony Capabilities

7.3.3.1 Using Bypass Mechanism for V.34 Fax Transmission

In this proprietary scenario, the device uses bypass (or NSE) mode to transmit V.34 faxes,

enabling the full utilization of its speed.

Configure the following parameters to use bypass mode for both T.30 and V.34 faxes:

 FaxTransportMode = 2 (Bypass)

 V34ModemTransportType = 2 (Modem bypass)

 V32ModemTransportType = 2

 V23ModemTransportType = 2

 V22ModemTransportType = 2

Configure the following parameters to use bypass mode for V.34 faxes and T.38 for T.30

faxes:

 FaxTransportMode = 1 (Relay)

 V34ModemTransportType = 2 (Modem bypass)

 V32ModemTransportType = 2

 V23ModemTransportType = 2

 V22ModemTransportType = 2

7.3.3.2 Using Relay mode for both T.30 and V.34 faxes

In this scenario, V.34 fax machines are forced to use their backward compatibility with T.30

faxes and operate in the slower T.30 mode.

Use the following parameters to use T.38 mode for both V.34 faxes and T.30 faxes:

 FaxTransportMode = 1 (Relay)

 V34ModemTransportType = 0 (Transparent)

 V32ModemTransportType = 0

 V23ModemTransportType = 0

 V22ModemTransportType = 0

7.3.4 Supporting V.152 Implementation

The device supports the ITU-T recommendation V.152 (Procedures for Supporting Voice-

Band Data over IP Networks). Voice-band data (VBD) is the transport of modem, facsimile,

and text telephony signals over a voice channel of a packet network with a codec

appropriate for such signals.

For V.152 capability, the device supports T.38 as well as VBD codecs (i.e., G.711 A-law

and G.711 μ-law). The selection of capabilities is performed using the coders table (refer to

''Coders'' on page 123).

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AudioCodes MediaPack 114 Manual do Utilizador Página 325