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.
 [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):
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
 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'
 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.
Web: SIP Transport Type
EMS: Transport Type
[SIPTransportType]
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.
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