AudioCodes Mediant 800B MSBR User Manual page 827

Mediant 800B MSBR
Parameter
CLI: fax-vbd-behvr
[FaxVBDBehavior]
[NoAudioPayloadType]
Web: SIP Transport Type
EMS: Transport Type
CLI: app-sip-transport-type
[SIPTransportType]
Web: SIP UDP Local Port
EMS: Local SIP Port
CLI: sip-udp-local-port
Version 6.8

[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) with
regular G.711 payload types 0 or 8 are configured 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] = (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 this parameter is also used by the SAS application as
the default transport layer for outgoing SIP calls.
Defines the local UDP port for SIP messages.
The valid range is 1 to 65534. The default is 5060.
827
67. Configuration Parameters Reference
Description
Mediant 800B MSBR