CHAPTER60 Configuration Parameters Reference
Mediant 4000 SBC | User's Manual
Parameter Description
'Fax Signaling Method'
fax-sig-method
[IsFaxUsed]
Global parameter defining the SIP signaling method for establishing
and transmitting a fax session when the device detects a fax.
You can also configure this feature per specific calls, using IP
Profiles (IpProfile_IsFaxUsed). For a detailed description of the
parameter, see Configuring IP Profiles .
Note: If this feature is configured for a specific IP Profile, the
settings of this global parameter is ignored for calls associated with
the IP Profile.
fax-vbd-behvr
[FaxVBDBehavior]
Determines the device's fax transport behavior when G.711 VBD
coder is negotiated at call start.
■ [0] = (Default) If the device is configured with a VBD coder (see
the CodersGroup parameter) and is negotiated OK at call start,
then both fax and modem signals are sent over RTP using the
bypass payload type (and no mid-call VBD or T.38 Re-INVITEs
occur).
■ [1] = If the IsFaxUsed parameter is set to 1, the channel opens
with the FaxTransportMode parameter set to 1 (relay). This is
required to detect mid-call fax tones and to send T.38 Re-INVITE
messages upon fax detection. If the remote party supports T.38,
the fax is relayed over T.38.
Note:
■ If VBD coder negotiation fails at call start and if the IsFaxUsed
parameter is set to 1 (or 3), then the channel opens with the
FaxTransportMode parameter set to 1 (relay) to allow future
detection of fax tones and sending of T.38 Re-INVITES. In such
a scenario, the FaxVBDBehavior parameter has no effect.
■ This feature can be used only if the remote party supports T.38
fax relay; otherwise, the fax fails.
[NoAudioPayloadTyp
e]
Defines the payload type of the outgoing SDP offer.
The valid value range is 96 to 127 (dynamic payload type). The
default is 0 (i.e. NoAudio is not supported). For example, if set to
120, the following is added to the INVITE SDP:
a=rtpmap:120 NoAudio/8000\r\n
Note: For incoming SDP offers, NoAudio is always supported.
'SIP Transport Type'
configure voip >
sip-definition
settings > app-
sip-transport-
type
[SIPTransportType]
Determines the default transport layer for outgoing SIP calls initiated
by the device.
■ [0] UDP (default)
■ [1] TCP
■ [2] TLS (SIPS)
Note:
■ 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.
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