AudioCodes Mediant 3000 User Manual page 607

SIP User's Manual
Parameter
[HandleG711asVBD]
[FaxVBDBehavior]
Web: SIP Transport Type
EMS: Transport Type
[SIPTransportType]
Version 6.4
IPProfile parameter).

For more information on fax transport methods, see 'Fax/Modem
Transport Modes' on page 157.
Enables the handling of G.711 as G.711 VBD coder.

[0] = Disable (default). The device negotiates G.711 as a regular
audio coder and sends an answer only with G.729 coder. For
example, if the device is configured with G.729 and G.711 VBD
coders and it receives an INVITE with an SDP offer containing
G.729 and "regular" G.711 coders, it sends an SDP answer
containing only the G.729 coder.

[1] = Enable. The device assumes that the G.711 coder received
in the INVITE SDP offer is a VBD coder. For example, if the device
is configured with G.729 and G.711 VBD coders and it receives an
INVITE with an SDP offer containing G.729 and "regular" G.711
coders, it sends an SDP answer containing G.729 and G.711 VBD
coders, allowing a subsequent bypass (passthrough) session if
fax/modem signals are detected during the call.
Note: This parameter is applicable only if G.711 VBD coder(s) are
selected for the device (using the CodersGroup parameter).
Determines the device's fax transport behavior when G.711 VBD
coder is negotiated at call start.

[0] = 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).
(Default.)

[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.
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.
607
32. Viewing Syslog Messages
Description
November 2011