AudioCodes mediapack MP-500, User Manual

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Version 5.8 321 October 2009
SIP User's Manual 6. Configuration Parameters Reference
Parameter Description
Web: Fax Signaling Method
EMS: Fax Used
[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):
9
Echo Canceller = On
9
Silence Compression = Off
9
Echo Canceller Non-Linear Processor Mode = Off
9
Dynamic Jitter Buffer Minimum Delay = 40
9
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:
9
For A-law: 'a=gpmd:8 vbd=yes;ecan=on'
9
For
μ
-law: 'a=gpmd:0 vbd=yes;ecan=on'
ƒ
When this parameter is set to 1, 2, or 3, the parameter
FaxTransportMode is ignored.
ƒ
When the value of this parameter is set to 0, 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
492 .
Web: SIP Transport Type
EMS: Transport Type
[SIPTransportType]
Determines the default transport layer for outgoing SIP calls
initiated by the device.
ƒ
[0] UDP (default)
ƒ
[1] TCP
ƒ
[2] TLS (SIPS)
Notes:
ƒ
It's recommended to use TLS for communication with a
SIP Proxy and not for direct device-to-device
communication.
ƒ
For received calls (i.e., incoming), the device accepts all
these protocols.
ƒ
The value of this parameter is also used by the SAS
application as the default transport layer for outgoing SIP
calls.