AudioCodes Mediant 2600 - Page 593

Version 6.8 593 Mediant 2600 E-SBC
User's Manual 43. Configuration Parameters Reference
Parameter Description
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).
CLI: 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.
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.
[NoAudioPayloadType] 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.
Web: SIP Transport Type
EMS: Transport Type
CLI: 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)
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.
Web: SIP UDP Local Port
EMS: Local SIP Port
CLI: sip-udp-local-port
[LocalSIPPort]
Defines the local UDP port for SIP messages.
The valid range is 1 to 65534. The default is 5060.
Web: SIP TCP Local Port Defines the local TCP port for SIP messages.