AudioCodes Mediant 2000, Руководство пользователя

Страница: 124 / 418

SIP User's Manual 124 Document #: LTRT-68808
Mediant 2000
Parameter Description
obtained: first priority is P-Asserted-Identity, second is Remote-Party-ID,
and third is the From header. Once a URL is selected, all the calling party
parameters are set from this header. If P-Asserted-Identity is selected, the
Privacy header is checked and if the Privacy is set to 'id', the calling
number is assumed restricted.
Fax Signaling Method
[IsFaxUsed]
Determines the SIP signaling method for establishing and transmitting a fax
session after a fax is detected.
ƒ
[0]
No Fax = No fax negotiation using SIP signaling. Fax transport
method is according to the parameter FaxTransportMode (default).
ƒ
[1]
T.38 Relay = Initiates T.38 fax relay.
ƒ
[2]
G.711 Transport = Initiates fax / modem using the coder G.711 A-
law/
μ
-law with adaptations (refer to Note below).
ƒ
[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:
ƒ
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
ƒ
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'.
ƒ
When IsFaxUsed is set to 1, 2, or 3, the parameter FaxTransportMode
is ignored.
ƒ
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.
ƒ
For detailed information on fax transport methods, refer to ''Fax/Modem
Transport Modes'' on page
351 .
Detect Fax on Answer
Tone
[DetFaxOnAnswerTon
e]
Determines when the device initiates a T.38 session for fax transmission.
ƒ
[0]
Initiate T.38 on Preamble = The device to which the called fax is
connected initiates a T.38 session on receiving Preamble signal from
the fax (default).
ƒ
[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:
ƒ
For this parameter to take effect, you must reset the device.
ƒ
This parameters is applicable only if the
ini
file parameter IsFaxUsed is
set to 1 or 3.