AudioCodes MediaPack 114 Manual do Utilizador descarregar pdf (Página 73)

Version 5.6 73 November 2008

SIP User's Manual 3. Web-Based Management

Parameter Description

Fax/Modem Bypass Coder

Type

[FaxModemBypassCode

rType]

Coder used by the device when performing fax/modem bypass. Usually,

high-bit-rate coders such as G.711 should be used.

 [0] G.711Alaw= G.711 A-law 64 (default).

 [1] G.711Mulaw = G.711 μ-law.

Fax/Modem Bypass

Packing Factor

[FaxModemBypassM]

Number of (20 msec) coder payloads that are used to generate a

fax/modem bypass packet.

The valid range is 1, 2, or 3 coder payloads. The default value is 1

coder payload.

Fax Bypass Output Gain

[FaxBypassOutputGain]

Defines the fax bypass output gain control.

The range is -31 to +31 dB, in 1-dB steps. The default is 0 (i.e., no

gain).

Modem Bypass Output

Gain

[ModemBypassOutputG

ain]

Defines the modem bypass output gain control.

The range is -31 dB to +31 dB, in 1-dB steps. The default is 0 (i.e., no

gain).

Fax CNG Mode

[FaxCNGMode]

Determines the device's behavior upon detection of a CNG tone.

 [0] = Does not send a SIP Re-INVITE upon detection of a fax CNG

tone when CNGDetectorMode is set to 1 (default).

 [1] = Sends a SIP Re-INVITE upon detection of a fax CNG tone

when CNGDetectorMode is set to 1.

CNG Detector Mode

[CNGDetectorMode]

Determines whether the device detects the fax Calling tone (CNG).

 [0] Disable = The originating device doesn’t detect CNG; the CNG

signal passes transparently to the remote side (default).

 [1] Relay = CNG is detected on the originating side. CNG packets

are sent to the remote side according to T.38 (if IsFaxUsed = 1) and

the fax session is started. A Re-INVITE message isn’t sent and the

fax session starts by the terminating device. This option is useful, for

example, when the originating device is located behind a firewall that

blocks incoming T.38 packets on ports that have not yet received

T.38 packets from the internal network (i.e., originating device). To

also send a SIP Re-INVITE message upon detection of a fax CNG

tone in this mode, set the parameter FaxCNGMode to 1.

 [2] Events Only = CNG is detected on the originating side and a fax

session is started by the originating side using the Re-INVITE

message. Usually, T.38 fax session starts when the ‘preamble’

signal is detected by the answering side. Some SIP devices don’t

support the detection of this fax signal on the answering side and

thus, in these cases it is possible to configure the device to start the

T.38 fax session when the CNG tone is detected by the originating

side. However, this mode is not recommended.

T.38 Max Datagram Size

[T38MaxDatagram]

Defines the maximum size of a T.38 datagram that the device can

receive. This value is included in the outgoing SDP when T.38 is in use.

The valid range is 122 to 1,024. The default value is 122.

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