AudioCodes Mediant 4000 SBC User Manual page 865

User's Manual
Parameter
Fax Signaling Method
fax-sig-method
[IsFaxUsed]
fax-vbd-behvr
[FaxVBDBehavior]
[NoAudioPayloadType]
SIP Transport Type
configure voip > sip-
definition settings >
app-sip-transport-type
[SIPTransportType]
Display Default SIP
Port
configure voip > sip-
Version 7.2
(host part only) is used.
The valid range is a 30-character string. By default, this value is not
defined.
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 functionality per specific calls, using IP
Profiles (IpProfile_IsFaxUsed). For a detailed description of the
parameter, see ''Configuring IP Profiles'' on page 418.
Note: If this functionality is configured for a specific IP Profile, the settings
of this global parameter is ignored for calls associated with the IP Profile.
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.
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.
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.
Enables the device to add the default SIP port 5060 (UDP/TCP) or 5061
(TLS) to outgoing messages that are received without a port. This
condition also applies to manipulated messages where the resulting
message has no port number. The device adds the default port number to
865
60. Configuration Parameters Reference
Description
Mediant 4000 SBC