3Com VCX v7111 User Manual page 67

Parameter
Fax Signaling Method
[IsFaxUsed]
Detect Fax on Answer Tone
[DetFaxOnAnswerTone]
SIP Transport Type
[SIPTransportType]
SIP UDP Local Port
[LocalSIPPort]
SIP TCP Local Port
[TCPLocalSIPPort]
SIP TLS Local Port
[TLSLocalSIPPort]
®
3Com VCX V7111 VoIP Gateway User Guide
Description
Determines the SIP signaling method used to establish and convey a
fax session after a fax is detected.
No Fax
signaling (default).
T.38 Relay
G.711 Transport
G.711 A-law/μ-law with adaptations (see note 1).
Fax Fallback
T.38 negotiation fails, the gateway re-initiates a fax session using the
coder G.711 A-law/μ-law with adaptations (see note 1).
Fax adaptations:
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 gateway 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:0 vbd=yes;ecan=on. For
a=gpmd:8 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 protocols involvement. To
completely disable T.38, set FaxTransportMode to a value
other than 1.
Initiate T.38 on Preamble [0] = Terminating fax gateway initiates
T.38 session on receiving of HDLC preamble signal from fax (default)
Initiate T.38 on CED
T.38 session on receiving of CED answer tone from fax.
This parameters is applicable only if IsFaxUsed = 1.
Determines the default transport layer used for outgoing SIP calls
initiated by the gateway.
UDP [0] (default).
TCP [1].
TLS [2] (SIPS).
It is recommended to use TLS to communicate with a SIP
Proxy and not for direct gateway-gateway communication.
Local UDP port used to receive SIP messages.
The valid range is 1 to 65534. The default value is 5060.
Local TCP port used to receive SIP messages.
The default value is 5060.
Local TLS port used to receive SIP messages.
The default value is 5061.
The value of TLSLocalSIPPort must be different to the value
of TCPLocalSIPPort.
[0] = No fax negotiation using SIP
[1] = Initiates T.38 fax relay.
[2] = Initiates fax using the coder
[3] = Initiates T.38 fax relay. If the
[1] = Terminating fax gateway initiates
μ
-law:
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