AudioCodes MediaPack 114 Manual do Utilizador descarregar pdf (Página 320)

SIP User's Manual 320 Document #: LTRT-65411

MediaPack Series

When fax transmission ends, the reverse switching from fax relay to voice is automatically

performed at both the local and remote endpoints.

You can change the fax rate declared in the SDP, using the parameter FaxRelayMaxRate

(this parameter doesn’t affect the actual transmission rate). In addition, you can enable or

disable Error Correction Mode (ECM) fax mode using the FaxRelayECMEnable parameter.

When using T.38 mode, you can define a redundancy feature to improve fax transmission

over congested IP networks. This feature is activated using the FaxRelayRedundancyDepth

and FaxRelayEnhancedRedundancyDepth parameters. Although this is a proprietary

redundancy scheme, it should not create problems when working with other T.38 decoders.

7.3.2.1.1 Switching to T.38 Mode using SIP Re-INVITE

In the Switching to T.38 Mode using SIP Re-INVITE mode, upon detection of a fax signal,

the terminating device negotiates T.38 capabilities using a Re-INVITE message. If the far-

end device doesn't support T.38, the fax fails. In this mode, the parameter

FaxTransportMode is ignored.

To configure T.38 mode using SIP Re-INVITE messages, set IsFaxUsed to 1. Additional

configuration parameters include the following:

 FaxRelayEnhancedRedundancyDepth

 FaxRelayRedundancyDepth

 FaxRelayECMEnable

 FaxRelayMaxRate

7.3.2.1.2 Automatically Switching to T.38 Mode without SIP Re-INVITE

In the Automatically Switching to T.38 Mode without SIP Re-INVITE mode, when a fax

signal is detected, the channel automatically switches from the current voice coder to

answer tone mode, and then to T.38-compliant fax relay mode.

To configure automatic T.38 mode, perform the following configurations:

 IsFaxUsed = 0

 FaxTransportMode = 1

 Additional configuration parameters:

• FaxRelayEnhancedRedundancyDepth

• FaxRelayRedundancyDepth

• FaxRelayECMEnable

• FaxRelayMaxRate

7.3.2.2 Fax/Modem Bypass Mode

In this proprietary mode, when fax or modem signals are detected, the channel

automatically switches from the current voice coder to a high bit-rate coder (according to

the parameter FaxModemBypassCoderType). In addition, the channel is automatically

reconfigured with the following fax / modem adaptations:

 Disables silence suppression

 Enables echo cancellation for fax

 Disables echo cancellation for modem

 Performs certain jitter buffering optimizations

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