AudioCodes MediaPack 114 Manual de usuario descargar pdf (Pagina 104)

SIP User's Manual 104 Document #: LTRT-65411

MediaPack Series

Parameter Description

Fax Signaling Method

[IsFaxUsed]

Determines the SIP signaling method for establishing and transmitting a

fax session after a fax is detected.

 [0] No Fax = No fax negotiation using SIP signaling. Fax transport

method is according to the parameter FaxTransportMode (default).

 [1] T.38 Relay = Initiates T.38 fax relay.

 [2] G.711 Transport = Initiates fax / modem using the coder G.711 A-

law/μ-law with adaptations (refer to Note below).

 [3] Fax Fallback = Initiates T.38 fax relay. If the T.38 negotiation

fails, the device re-initiates a fax session using the coder G.711 A-

law/μ-law with adaptations (refer to the Note below).

Notes:

 Fax adaptations (for options 2 and 3):

Echo Canceller = On

Silence Compression = Off

Echo Canceller Non-Linear Processor Mode = Off

Dynamic Jitter Buffer Minimum Delay = 40

Dynamic Jitter Buffer Optimization Factor = 13

 If the device initiates a fax session using G.711 (option 2 and

possibly 3), a 'gpmd' attribute is added to the SDP in the following

format:

For A-law: 'a=gpmd:8 vbd=yes;ecan=on'.

For μ-law: 'a=gpmd:0 vbd=yes;ecan=on'.

 When IsFaxUsed is set to 1, 2, or 3, the parameter

FaxTransportMode is ignored.

 When the value of IsFaxUsed is other than 1, T.38 might still be used

without the control protocol's involvement. To completely disable

T.38, set FaxTransportMode to a value other than 1.

 For detailed information on fax transport methods, refer to

''Fax/Modem Transport Modes'' on page 319.

Detect Fax on Answer

Tone

[DetFaxOnAnswerTone]

Determines when the device initiates a T.38 session for fax

transmission.

 [0] Initiate T.38 on Preamble = The device to which the called fax is

connected initiates a T.38 session on receiving HDLC Preamble

signal from the fax (default).

 [1] Initiate T.38 on CED = The device to which the called fax is

connected initiates a T.38 session on receiving a CED answer tone

from the fax. This option can only be used to relay fax signals, as the

device sends T.38 Re-INVITE on detection of any fax/modem

Answer tone (2100 Hz, amplitude modulated 2100 Hz, or 2100 Hz

with phase reversals). The modem signal fails when using T.38 for

fax relay.

Notes:

 For this parameter to take effect, you must reset the device.

 This parameters is applicable only if the ini file parameter IsFaxUsed

is set to 1 or 3.

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