AudioCodes Mediant 800B User Manual page 976

Parameter
[FaxVBDBehavior]
[NoAudioPayloadType]
SIP Transport Type
app-sip-transport-
type
[SIPTransportType]
Display Default SIP Port
display-default-sip-
port
[DisplayDefaultSIPPort]
User's Manual
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.
Notes:

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)
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 the parameter is also used by the SAS application as
the default transport layer for outgoing SIP calls.
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 the following SIP headers: Request-Uri, To, From, P-
Asserted-Identity, P-Preferred-Identity, and P-Called-Party-ID. If the
message is received with a port number other than the default, for
example, 5070, the port number is not changed.
An example of a SIP From header with the default port is shown
below:
From:
<sip:+4000@10.8.4.105:5060;user=phone>;tag=f25419a
96a;epid=009FAB8F3E

[0] Disable (default)
976
Mediant 800B Gateway and E- SBC
Description
Document #: LTRT-10296