AudioCodes mediapack MP-500 User Manual page 321

SIP User's Manual
Parameter
Web: Fax Signaling Method
EMS: Fax Used
[IsFaxUsed]
Web: SIP Transport Type
EMS: Transport Type
[SIPTransportType]
Version 5.8
6. Configuration Parameters Reference
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 this parameter is set to 1, 2, or 3, the parameter
FaxTransportMode is ignored.
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.
For detailed information on fax transport methods, refer to
''Fax/Modem Transport Modes'' on page 492.
Determines the default transport layer for outgoing SIP calls
initiated by the device.
[0] UDP (default)
[1] TCP
[2] TLS (SIPS)
Notes:
It's recommended to use TLS for communication with a
SIP Proxy and not for direct device-to-device
communication.
For received calls (i.e., incoming), the device accepts all
these protocols.
The value of this parameter is also used by the SAS
application as the default transport layer for outgoing SIP
calls.
321
Description
October 2009